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Prof. Dr. Jianping Guo
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences

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0 radiosonde
0 boundary layer height

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Satellite
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radiosonde
boundary layer height
wind profiler
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mesoscale convective system

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Article
Published: 17 August 2021 in npj Climate and Atmospheric Science
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The result of Aethalometer model to black carbon (BC) source apportionment is highly determined by the absorption Ångström exponent (α) of aerosols from fossil fuel combustion (α ff) and wood burning (α wb). A method using hourly measured potassium to calculate the α ff and α wb values was developed in this study. Results showed that the optimal α ff and α wb were 1.09 and 1.79 for the whole dataset. The optimal α values in the diurnal resolution were also calculated with α ff and α wb varied in 1.02 –1.19 and 1.71–1.90, respectively. Using the dynamic α values, the Pearson correlation coefficient between BC and potassium from wood burning substantially improved compared to the results derived from the fixed α values. The method developed in this study is expected to provide more reasonable BC source identification results, which are helpful for air quality, climate, and human health modeling studies.

ACS Style

Huang Zheng; Shaofei Kong; Nan Chen; Zewei Fan; Ying Zhang; Liquan Yao; Yi Cheng; Shurui Zheng; Yingying Yan; Dantong Liu; Delong Zhao; Chao Liu; Tianliang Zhao; Jianping Guo; Shihua Qi. A method to dynamically constrain black carbon aerosol sources with online monitored potassium. npj Climate and Atmospheric Science 2021, 4, 1 -8.

AMA Style

Huang Zheng, Shaofei Kong, Nan Chen, Zewei Fan, Ying Zhang, Liquan Yao, Yi Cheng, Shurui Zheng, Yingying Yan, Dantong Liu, Delong Zhao, Chao Liu, Tianliang Zhao, Jianping Guo, Shihua Qi. A method to dynamically constrain black carbon aerosol sources with online monitored potassium. npj Climate and Atmospheric Science. 2021; 4 (1):1-8.

Chicago/Turabian Style

Huang Zheng; Shaofei Kong; Nan Chen; Zewei Fan; Ying Zhang; Liquan Yao; Yi Cheng; Shurui Zheng; Yingying Yan; Dantong Liu; Delong Zhao; Chao Liu; Tianliang Zhao; Jianping Guo; Shihua Qi. 2021. "A method to dynamically constrain black carbon aerosol sources with online monitored potassium." npj Climate and Atmospheric Science 4, no. 1: 1-8.

Research article
Published: 21 July 2021 in Earth's Future
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The contribution of biomass burning to the total aerosol loading over Monsoon Asia is both significant and continuing to increase. To better match the spatio-temporal distribution of aerosols and trace gasses observed in the free troposphere, this work applied a 3-D constrained emission inventory based on top-down remotely sensed NO2 measurement to investigate the most extreme of the annually occurring biomass burning seasons in Monsoon Asia. In 2016 this constituted an extreme event observed over a 6-day period covering millions of square kilometers, including over regions which are typically in the rainy phase of the Asian Monsoon. The results are shown to be consistent with respect to TRMM precipitation, AERONET measurements, MODIS AOD, MOPITT CO, and reanalysis meteorology, over both the biomass burning source as well as the millions of square kilometers downwind both to the East and to the Southwest. Reproducing the observed long-range transport pattern requires the time of biomass burning to be increased, regions not previously identified as burning to be actual source regions, and the emissions of BC to be 6.6 to 11.9 time larger than current inventories. The underlying mechanism for this long-range transport involves a new 3-D pathway that can occur during the transition from the North phase to the South phase of the Asian Monsoon. The results are also consistent with the new idea that large loadings of BC in the lower free troposphere may significantly affect the meteorological field and the overall vertical distribution of aerosols in the tropical troposphere.

ACS Style

Shuo Wang; Jason Blake Cohen; Weizhi Deng; Kai Qin; Jianping Guo. Using a New Top‐Down Constrained Emissions Inventory to Attribute the Previously Unknown Source of Extreme Aerosol Loadings Observed Annually in the Monsoon Asia Free Troposphere. Earth's Future 2021, 9, 1 .

AMA Style

Shuo Wang, Jason Blake Cohen, Weizhi Deng, Kai Qin, Jianping Guo. Using a New Top‐Down Constrained Emissions Inventory to Attribute the Previously Unknown Source of Extreme Aerosol Loadings Observed Annually in the Monsoon Asia Free Troposphere. Earth's Future. 2021; 9 (7):1.

Chicago/Turabian Style

Shuo Wang; Jason Blake Cohen; Weizhi Deng; Kai Qin; Jianping Guo. 2021. "Using a New Top‐Down Constrained Emissions Inventory to Attribute the Previously Unknown Source of Extreme Aerosol Loadings Observed Annually in the Monsoon Asia Free Troposphere." Earth's Future 9, no. 7: 1.

Research article
Published: 20 July 2021 in Journal of Geophysical Research: Atmospheres
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Two sets of 48-h hindcast experiments for Mei-yu season using non-hydrostatic global variable-resolution model (MPAS-Atmosphere) with regional refinement at 4 km resolution (V4km) and uniform 60 km resolution (U60km) are first-time conducted to attempt at simulating the Mei-yu rainfall in 2015 over East China. The analysis focuses on the seasonal average of diurnal variation of precipitation amount (PA), intensity (PI), and frequency (PF). Both simulations reasonably reproduce the spatial distribution of PA. V4km is more skillful in simulating the spatial distributions and magnitudes of PF and PI. The diurnal cycle of Mei-yu rainfall shows a major early morning peak and a minor afternoon peak, contributed by precipitation during two sub-periods with distinct synoptic circulations. With strong Mei-yu in the first sub-period, the diurnal variation of PA is controlled by nocturnal southwesterly jet. V4km overestimates the morning peak mainly due to its bias in simulating boundary layer inertial oscillation. Although differences in PA between the simulations are small, U60km overestimates PF and underestimates PI. With weak Mei-yu in the second sub-period, the diurnal variation of PA is controlled by both synoptic circulation and local convection. At both resolutions, deviations in the large-scale circulation modulated by a few typhoons lead to positive biases in the morning peak of PA. After removing the typhoon impacts, V4km captures the observed diurnal cycle of PA well, while U60km significantly underestimates PA and PI particularly in the afternoon. Future studies focusing on advancing modeling of southwesterly jet and typhoons may further improve convection permitting simulation of Mei-yu rainfall.

ACS Style

Mingyue Xu; Chun Zhao; Jun Gu; Jiawang Feng; Samson Hagos; L. Ruby Leung; Yali Luo; Jianping Guo; Rui Li; Yunfei Fu. Convection‐Permitting Hindcasting of Diurnal Variation of Mei‐yu Rainfall Over East China With a Global Variable‐Resolution Model. Journal of Geophysical Research: Atmospheres 2021, 126, 1 .

AMA Style

Mingyue Xu, Chun Zhao, Jun Gu, Jiawang Feng, Samson Hagos, L. Ruby Leung, Yali Luo, Jianping Guo, Rui Li, Yunfei Fu. Convection‐Permitting Hindcasting of Diurnal Variation of Mei‐yu Rainfall Over East China With a Global Variable‐Resolution Model. Journal of Geophysical Research: Atmospheres. 2021; 126 (14):1.

Chicago/Turabian Style

Mingyue Xu; Chun Zhao; Jun Gu; Jiawang Feng; Samson Hagos; L. Ruby Leung; Yali Luo; Jianping Guo; Rui Li; Yunfei Fu. 2021. "Convection‐Permitting Hindcasting of Diurnal Variation of Mei‐yu Rainfall Over East China With a Global Variable‐Resolution Model." Journal of Geophysical Research: Atmospheres 126, no. 14: 1.

Preprint content
Published: 15 July 2021
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This study reveals that haze pollution (HP) over the North China Plain (NCP) in winter can persist to following spring during most years. The persistence of HPNCP is attributed to maintenance of an anticyclonic anomaly (AA) over northeast Asia and southerly wind anomalies over the NCP. Southerly wind anomalies over the NCP reduce surface wind speed and increase relative humidity, which are conducive to above-normal HPNCP both in winter and spring. However, there exist several years when above-normal HPNCP in winter are followed by below-normal HPNCP in the following spring. The reversed HPNCP in winter and spring in these years is due to the inverted atmospheric anomalies over northeast Asia. In particular, AA over northeast Asia in winter is replaced by a cyclonic anomaly (CA) in the following spring. The resultant spring northerly wind anomalies over NCP are conducive to below-normal HPNCP. These two distinctive evolutions of HPNCP and atmospheric anomalies over northeast Asia from winter to spring are attributed to the different evolutions of sea surface temperature anomalies (SSTA) in the North Atlantic. In the persistent years, warm North Atlantic SSTA in winter maintains to following spring via positive air-sea interaction process and induces a negative spring North Atlantic Oscillation (NAO)-like pattern, which contributes to the AA over northeast Asia via atmospheric wave train. By contrast, in the reverse years, cold SSTA in the North Atlantic is maintained from winter to spring, which induces a positive spring NAO-like pattern and leads to CA over northeast Asia via atmospheric wave train. The findings suggest that North Atlantic SSTA plays crucial roles in modulating the distinct evolutions of HPNCP from winter to succedent spring, which can be served as an important preceding signal for haze pollution evolution over the North China Plain.

ACS Style

Linye Song; Shangfeng Chen; Wen Chen; Jianping Guo; Conglan Cheng; Yong Wang. Distinct evolutions of haze pollution from winter to following spring over the North China Plain: Role of the North Atlantic sea surface temperature anomalies. 2021, 2021, 1 -52.

AMA Style

Linye Song, Shangfeng Chen, Wen Chen, Jianping Guo, Conglan Cheng, Yong Wang. Distinct evolutions of haze pollution from winter to following spring over the North China Plain: Role of the North Atlantic sea surface temperature anomalies. . 2021; 2021 ():1-52.

Chicago/Turabian Style

Linye Song; Shangfeng Chen; Wen Chen; Jianping Guo; Conglan Cheng; Yong Wang. 2021. "Distinct evolutions of haze pollution from winter to following spring over the North China Plain: Role of the North Atlantic sea surface temperature anomalies." 2021, no. : 1-52.

Original paper
Published: 10 July 2021 in Advances in Atmospheric Sciences
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The satellite-based quantification of cloud radiative forcing remains poorly understood, due largely to the limitation or uncertainties in characterizing cloud-base height (CBH). Here, we use the CBH data from radiosonde measurements over China in combination with the collocated cloud-top height (CTH) and cloud properties from MODIS/Aqua to quantify the impact of CBH on shortwave cloud radiative forcing (SWCRF). The climatological mean SWCRF at the surface (SWCRFSUR), at the top of the atmosphere (SWCRFTOA), and in the atmosphere (SWCRFATM) are estimated to be −97.14, −84.35, and 12.79 W m−2, respectively for the summers spanning 2010 to 2018 over China. To illustrate the role of the cloud base, we assume four scenarios according to vertical profile patterns of cloud optical depth (COD). Using the CTH and cloud properties from MODIS alone results in large uncertainties for the estimation of SWCRFATM, compared with those under scenarios that consider the CBH. Furthermore, the biases of the CERES estimation of SWCRFATM tend to increase in the presence of thick clouds with low CBH. Additionally, the discrepancy of SWCRFATM relative to that calculated without consideration of CBH varies according to the vertical profile of COD. When a uniform COD vertical profile is assumed, the largest SWCRF discrepancies occur during the early morning or late afternoon. By comparison, the two-point COD vertical distribution assumption has the largest uncertainties occurring at noon when the solar irradiation peaks. These findings justify the urgent need to consider the cloud vertical structures when calculating the SWCRF which is otherwise neglected.

ACS Style

Hui Xu; Jianping Guo; Jian Li; Lin Liu; Tianmeng Chen; Xiaoran Guo; Yanmin Lyu; Ding Wang; Yi Han; Qi Chen; Yong Zhang. The Significant Role of Radiosonde-measured Cloud-base Height in the Estimation of Cloud Radiative Forcing. Advances in Atmospheric Sciences 2021, 38, 1552 -1565.

AMA Style

Hui Xu, Jianping Guo, Jian Li, Lin Liu, Tianmeng Chen, Xiaoran Guo, Yanmin Lyu, Ding Wang, Yi Han, Qi Chen, Yong Zhang. The Significant Role of Radiosonde-measured Cloud-base Height in the Estimation of Cloud Radiative Forcing. Advances in Atmospheric Sciences. 2021; 38 (9):1552-1565.

Chicago/Turabian Style

Hui Xu; Jianping Guo; Jian Li; Lin Liu; Tianmeng Chen; Xiaoran Guo; Yanmin Lyu; Ding Wang; Yi Han; Qi Chen; Yong Zhang. 2021. "The Significant Role of Radiosonde-measured Cloud-base Height in the Estimation of Cloud Radiative Forcing." Advances in Atmospheric Sciences 38, no. 9: 1552-1565.

Journal article
Published: 04 July 2021 in Boundary-Layer Meteorology
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ACS Style

Raman Solanki; Jianping Guo; Jian Li; Narendra Singh; Xiaoran Guo; Yi Han; Yanmin Lv; Jian Zhang; Boming Liu. Atmospheric-Boundary-Layer-Height Variation over Mountainous and Urban Sites in Beijing as Derived from Radar Wind-Profiler Measurements. Boundary-Layer Meteorology 2021, 1 .

AMA Style

Raman Solanki, Jianping Guo, Jian Li, Narendra Singh, Xiaoran Guo, Yi Han, Yanmin Lv, Jian Zhang, Boming Liu. Atmospheric-Boundary-Layer-Height Variation over Mountainous and Urban Sites in Beijing as Derived from Radar Wind-Profiler Measurements. Boundary-Layer Meteorology. 2021; ():1.

Chicago/Turabian Style

Raman Solanki; Jianping Guo; Jian Li; Narendra Singh; Xiaoran Guo; Yi Han; Yanmin Lv; Jian Zhang; Boming Liu. 2021. "Atmospheric-Boundary-Layer-Height Variation over Mountainous and Urban Sites in Beijing as Derived from Radar Wind-Profiler Measurements." Boundary-Layer Meteorology , no. : 1.

Journal article
Published: 18 May 2021 in Earth and Space Science
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To provide guidance for the use of reanalysis data in the Central Taklimakan Desert (CTD), five reanalysis products are evaluated based on the radiosonde data obtained from two field experiments during summer for the first time in the CTD, including the European Center for Medium‐Range Weather Forecasts (ECMWF) Reanalysis version 5 (ERA5), ECMWF Reanalysis‐Interim (ERA‐Interim), Japanese 55‐years Reanalysis (JRA55), Modern‐Era Retrospective Analysis for Research and Applications version 2 (MERRA2), and the National Centers for Environmental Prediction‐Department of Energy Reanalysis version 2 (NCEP2). The results show that reanalysis temperature (T), specific humidity (Q), geopotential height (GPH), and wind field (U and V components) are consistent with the radiosonde observations in terms of the vertical distribution. In general, ERA5 has the best performance in the CTD during the study period, followed closely by ERA‐Interim. However, NCEP2 produces the largest error. The errors of all the reanalysis data show significant diurnal variations, and the diurnal variations differ from each other. Moreover, the results indicate that the reanalysis datasets have the largest deviation at 850 hPa (near the ground), which means that in the desert region complex interactions may exist between the land surface and the atmosphere. Therefore, more attention should be paid to the description of complex interactions between land and atmosphere over the moving‐sand desert region in the numerical models.

ACS Style

Jie Huang; Jinfang Yin; Minzhong Wang; Qing He; Jianping Guo; Jiantao Zhang; Xudong Liang; Yanxin Xie. Evaluation of Five Reanalysis Products With Radiosonde Observations Over the Central Taklimakan Desert During Summer. Earth and Space Science 2021, 8, 1 .

AMA Style

Jie Huang, Jinfang Yin, Minzhong Wang, Qing He, Jianping Guo, Jiantao Zhang, Xudong Liang, Yanxin Xie. Evaluation of Five Reanalysis Products With Radiosonde Observations Over the Central Taklimakan Desert During Summer. Earth and Space Science. 2021; 8 (5):1.

Chicago/Turabian Style

Jie Huang; Jinfang Yin; Minzhong Wang; Qing He; Jianping Guo; Jiantao Zhang; Xudong Liang; Yanxin Xie. 2021. "Evaluation of Five Reanalysis Products With Radiosonde Observations Over the Central Taklimakan Desert During Summer." Earth and Space Science 8, no. 5: 1.

Preprint content
Published: 17 May 2021
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The planetary boundary layer height (BLH) governs the vertical transport of mass, momentum and moisture between the surface and the free atmosphere, and thus its characterization is recognized as crucial for air quality, weather and climate. Although reanalysis products can provide important insight into the global view of BLH in a seamless way, the in situ observed BLH on a global scale remains poorly understood due to the lack of high-resolution (1-s or 2-s) radiosonde measurements. The present study attempts to establish a near-global BLH climatology at synoptic times (0000 and 1200 UTC) and in the daytime using high-resolution radiosonde measurements over 300 radiosonde sites worldwide for the period 2012 to 2019, which is then compared against the BLHs obtained from four reanalysis datasets, including ERA-5, MERRA-2, JRA-55, and NCEP-2. The variations of BLH exhibit large spatial and temporal dependence, and as a result the BLH maxima are generally discerned over the regions such as Western United States and Western China, in which the balloon launch times mostly correspond to the afternoon. The diurnal variations of BLH are revealed with a peak at 1700 Local Solar Time (LST). The most promising reanalysis product is ERA-5, which underestimates BLH by around 130 m as compared to radiosondes. In addition, MERRA-2 is a well-established product and has an underestimation of around 160 m. JRA-55 and NCEP-2 might produce considerable additional uncertainties, with a much larger underestimation of up to 400 m. The largest bias in the reanalysis data appears over the Western United States and Western China and it might be attributed to the maximal BLH in the afternoon when the boundary layer has grown up. Statistical analyses further indicate that the biases of reanalysis BLH products are positively associated with orographic complexity, as well as the occurrence of static instability. To our best knowledge, this study presents the first near-global view of high-resolution radiosonde derived BLH and provides a quantitative assessment of the four frequently used reanalysis products.

ACS Style

Jianping Guo; Jian Zhang; Kun Yang; Hong Liao; Shaodong Zhang; Kaiming Huang; Yanmin Lv; Jia Shao; Tao Yu; Bing Tong; Jian Li; Tianning Su; Steve H. L. Yim; Ad Stoffelen; Panmao Zhai; Xiaofeng Xu. Investigation of near-global daytime boundary layer height using high-resolution radiosondes: First results and comparison with ERA-5, MERRA-2, JRA-55, and NCEP-2 reanalyses. 2021, 2021, 1 -39.

AMA Style

Jianping Guo, Jian Zhang, Kun Yang, Hong Liao, Shaodong Zhang, Kaiming Huang, Yanmin Lv, Jia Shao, Tao Yu, Bing Tong, Jian Li, Tianning Su, Steve H. L. Yim, Ad Stoffelen, Panmao Zhai, Xiaofeng Xu. Investigation of near-global daytime boundary layer height using high-resolution radiosondes: First results and comparison with ERA-5, MERRA-2, JRA-55, and NCEP-2 reanalyses. . 2021; 2021 ():1-39.

Chicago/Turabian Style

Jianping Guo; Jian Zhang; Kun Yang; Hong Liao; Shaodong Zhang; Kaiming Huang; Yanmin Lv; Jia Shao; Tao Yu; Bing Tong; Jian Li; Tianning Su; Steve H. L. Yim; Ad Stoffelen; Panmao Zhai; Xiaofeng Xu. 2021. "Investigation of near-global daytime boundary layer height using high-resolution radiosondes: First results and comparison with ERA-5, MERRA-2, JRA-55, and NCEP-2 reanalyses." 2021, no. : 1-39.

Preprint content
Published: 17 May 2021
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ACS Style

Jianping Guo; Jian Zhang; Kun Yang; Hong Liao; Shaodong Zhang; Kaiming Huang; Yanmin Lv; Jia Shao; Tao Yu; Bing Tong; Jian Li; Tianning Su; Steve H. L. Yim; Ad Stoffelen; Panmao Zhai; Xiaofeng Xu. Supplementary material to "Investigation of near-global daytime boundary layer height using high-resolution radiosondes: First results and comparison with ERA-5, MERRA-2, JRA-55, and NCEP-2 reanalyses". 2021, 1 .

AMA Style

Jianping Guo, Jian Zhang, Kun Yang, Hong Liao, Shaodong Zhang, Kaiming Huang, Yanmin Lv, Jia Shao, Tao Yu, Bing Tong, Jian Li, Tianning Su, Steve H. L. Yim, Ad Stoffelen, Panmao Zhai, Xiaofeng Xu. Supplementary material to "Investigation of near-global daytime boundary layer height using high-resolution radiosondes: First results and comparison with ERA-5, MERRA-2, JRA-55, and NCEP-2 reanalyses". . 2021; ():1.

Chicago/Turabian Style

Jianping Guo; Jian Zhang; Kun Yang; Hong Liao; Shaodong Zhang; Kaiming Huang; Yanmin Lv; Jia Shao; Tao Yu; Bing Tong; Jian Li; Tianning Su; Steve H. L. Yim; Ad Stoffelen; Panmao Zhai; Xiaofeng Xu. 2021. "Supplementary material to "Investigation of near-global daytime boundary layer height using high-resolution radiosondes: First results and comparison with ERA-5, MERRA-2, JRA-55, and NCEP-2 reanalyses"." , no. : 1.

Journal article
Published: 01 May 2021 in Environmental Research Letters
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ACS Style

Yanmin Lv; Jianping Guo; Jian Li; Lijuan Cao; Tianmeng Chen; Ding Wang; Dandan Chen; Yi Han; Xiaoran Guo; Hui Xu; Lin Liu; Raman Solanki; Gang Huang. Spatiotemporal characteristics of atmospheric turbulence over China estimated using operational high-resolution soundings. Environmental Research Letters 2021, 16, 054050 .

AMA Style

Yanmin Lv, Jianping Guo, Jian Li, Lijuan Cao, Tianmeng Chen, Ding Wang, Dandan Chen, Yi Han, Xiaoran Guo, Hui Xu, Lin Liu, Raman Solanki, Gang Huang. Spatiotemporal characteristics of atmospheric turbulence over China estimated using operational high-resolution soundings. Environmental Research Letters. 2021; 16 (5):054050.

Chicago/Turabian Style

Yanmin Lv; Jianping Guo; Jian Li; Lijuan Cao; Tianmeng Chen; Ding Wang; Dandan Chen; Yi Han; Xiaoran Guo; Hui Xu; Lin Liu; Raman Solanki; Gang Huang. 2021. "Spatiotemporal characteristics of atmospheric turbulence over China estimated using operational high-resolution soundings." Environmental Research Letters 16, no. 5: 054050.

Journal article
Published: 30 April 2021 in Atmospheric Environment
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Fine particles with aerodynamic diameters less than 1 μm (PM1) often exert a greater threaten on human health, and thus it is highly imperative to accurately characterize the spatiotemporal variation of PM1 concentrations and to assess the potential health risks. Our study attempted to predict the long-term full-coverage PM1 concentrations across China during 2004–2018 using a stacking decision tree model based on satellite data, meteorological variables, and other geographical covariates. The result suggested that the stacking model captured strong prediction capability with a higher cross-validation (CV) R2 value (0.64), and the lower root-mean-square error (RMSE: 18.60 μg/m3) and mean absolute error (MAE: 11.96 μg/m3) compared with the individual model. The higher PM1 concentrations were mainly concentrated on North China Plain (NCP), Yangtze River Delta (YRD), and Sichuan Basin due to intensive anthropogenic activities and poor meteorological conditions especially in winter. The annual mean PM1 concentration in China exhibited a remarkable increase during 2004–2007 by 1.34 μg/m3/year (p < 0.05), followed by a gradual decrease during 2007–2018 by −1.61 μg/m3/year (p < 0.05). After 2013, the mean PM1 concentration at the national scale experienced a dramatic decrease by −2.96 μg/m3/year (p < 0.05). The persistent increase of PM1 concentration across China during 2004–2007 was mainly caused by the rapid increases of energy consumption and inefficient emission control measures, while the dramatic decrease since 2013 was attributed to increasingly strict control measures, particularly the implementation of the Air Pollution Prevention and Control Action Plan (the Action Plan). The long-term PM1 estimates obtained here provide a key scientific basis and data support for epidemiological research and air pollution mitigation.

ACS Style

Rui Li; Jianping Guo; Guannan Geng; Qingyang Xiao; Qiang Zhang. Satellite-derived long-term estimates of full-coverage PM1 concentrations across China based on a stacking decision tree model. Atmospheric Environment 2021, 255, 118448 .

AMA Style

Rui Li, Jianping Guo, Guannan Geng, Qingyang Xiao, Qiang Zhang. Satellite-derived long-term estimates of full-coverage PM1 concentrations across China based on a stacking decision tree model. Atmospheric Environment. 2021; 255 ():118448.

Chicago/Turabian Style

Rui Li; Jianping Guo; Guannan Geng; Qingyang Xiao; Qiang Zhang. 2021. "Satellite-derived long-term estimates of full-coverage PM1 concentrations across China based on a stacking decision tree model." Atmospheric Environment 255, no. : 118448.

Journal article
Published: 27 April 2021 in Journal of Geophysical Research: Atmospheres
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A new methodology is developed to construct a global (60°S–60°N) long‐term (2000‐2019) high‐resolution (∼10‐km, hourly) mesoscale convective system (MCS) database by tracking MCS jointly using geostationary satellite infrared brightness temperature (Tb) and precipitation feature (PF) characteristics from the Integrated Multi‐satellitE Retrievals for GPM (IMERG) precipitation datasets. Independent validation shows that the satellite‐based MCS dataset is able to reproduce important MCS statistics derived from ground‐based radar network observations in the U.S. and China. We show that by carefully considering key PF characteristics in addition to Tb signatures, the new method significantly improves upon previous Tb‐only methods in detecting MCSs in the midlatitudes for all seasons. Results show that MCSs account for over 50% of annual total rainfall across most of the tropical belt and in select regions of the midlatitudes, with a strong seasonality over many regions of the globe. The tracking database allows Lagrangian aspects such as MCS lifetime and translational speed and direction to be analyzed. The longest‐lived MCSs preferentially occur over the subtropical oceans. The land MCSs have higher cloud‐tops associated with more intense convection, and oceanic MCSs have much higher rainfall production. While MCSs are observed in many regions of the globe, there are fundamental differences in their dynamic and thermodynamic structures that warrant better understanding of processes that control their evolution. This global database provides significant opportunities for observational and modeling studies of MCSs, their characteristics and roles in regional and global water and energy cycles, as well as their hydrologic and other impacts.

ACS Style

Zhe Feng; L. Ruby Leung; Nana Liu; Jingyu Wang; Robert A. Houze; Jianfeng Li; Joseph C. Hardin; Dandan Chen; Jianping Guo. A Global High‐Resolution Mesoscale Convective System Database Using Satellite‐Derived Cloud Tops, Surface Precipitation, and Tracking. Journal of Geophysical Research: Atmospheres 2021, 126, 1 .

AMA Style

Zhe Feng, L. Ruby Leung, Nana Liu, Jingyu Wang, Robert A. Houze, Jianfeng Li, Joseph C. Hardin, Dandan Chen, Jianping Guo. A Global High‐Resolution Mesoscale Convective System Database Using Satellite‐Derived Cloud Tops, Surface Precipitation, and Tracking. Journal of Geophysical Research: Atmospheres. 2021; 126 (8):1.

Chicago/Turabian Style

Zhe Feng; L. Ruby Leung; Nana Liu; Jingyu Wang; Robert A. Houze; Jianfeng Li; Joseph C. Hardin; Dandan Chen; Jianping Guo. 2021. "A Global High‐Resolution Mesoscale Convective System Database Using Satellite‐Derived Cloud Tops, Surface Precipitation, and Tracking." Journal of Geophysical Research: Atmospheres 126, no. 8: 1.

Journal article
Published: 26 April 2021 in Atmospheric Chemistry and Physics
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Convective clouds are common and play a major role in Earth's water cycle and energy balance; they may even develop into storms and cause severe rainfall events. To understand the convective cloud development process, this study investigates the impact of aerosols on convective clouds by considering the influence of both topography and diurnal variation in radiation. By combining texture analysis, clustering, and thresholding methods, we identify all convective clouds in two warm seasons (May–September, 2016/17) in eastern China based on Himawari-8 Level 1 data. Having large diurnally resolved cloud data together with surface meteorological and environmental measurements, we investigate convective cloud properties and their variation, stratified by elevation and diurnal change. We then analyze the potential impact of aerosol on convective clouds under different meteorological conditions and topographies. In general, convective clouds tend to occur preferentially under polluted conditions in the morning, which reverses in the afternoon. Convective cloud fraction first increases then decreases with aerosol loading, which may contribute to this phenomenon. Topography and diurnal meteorological variations may affect the strength of aerosol microphysical and radiative effects. Updraft is always stronger along the windward slopes of mountains and plateaus, especially in northern China. The prevailing southerly wind near the foothills of mountains and plateaus is likely to contribute to this windward strengthening of updraft and to bring more pollutant into the mountains, thereby strengthening the microphysical effect, invigorating convective clouds. By comparison, over plain, aerosols decrease surface heating and suppress convection by blocking solar radiation reaching the surface.

ACS Style

Tianmeng Chen; Zhanqing Li; Ralph A. Kahn; Chuanfeng Zhao; Daniel Rosenfeld; Jianping Guo; Wenchao Han; Dandan Chen. Potential impact of aerosols on convective clouds revealed by Himawari-8 observations over different terrain types in eastern China. Atmospheric Chemistry and Physics 2021, 21, 6199 -6220.

AMA Style

Tianmeng Chen, Zhanqing Li, Ralph A. Kahn, Chuanfeng Zhao, Daniel Rosenfeld, Jianping Guo, Wenchao Han, Dandan Chen. Potential impact of aerosols on convective clouds revealed by Himawari-8 observations over different terrain types in eastern China. Atmospheric Chemistry and Physics. 2021; 21 (8):6199-6220.

Chicago/Turabian Style

Tianmeng Chen; Zhanqing Li; Ralph A. Kahn; Chuanfeng Zhao; Daniel Rosenfeld; Jianping Guo; Wenchao Han; Dandan Chen. 2021. "Potential impact of aerosols on convective clouds revealed by Himawari-8 observations over different terrain types in eastern China." Atmospheric Chemistry and Physics 21, no. 8: 6199-6220.

Research article
Published: 21 April 2021 in Boundary-Layer Meteorology
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Surface-layer stability is important in many processes, such as in the surface energy budget, atmospheric pollution, and boundary-layer parametrizations. Most previous studies on stability, however, conducted either theoretical or observational investigations at specific sites, thus leaving a gap with regard to the large-scale pattern. Here, wind-speed and temperature observations at multiple heights from the wind-tower network of China are used to estimate low-level stability during the 2009–2016 period. A series of data-quality-control procedures are conducted and data from 170 wind towers with more than 2 years of valid observations are selected. The degree of stability is classified by the Obukhov length, which is derived from the wind speed and temperature at 10 m and 70 m above ground level, combined with information regarding the roughness length. Overall, the occurrence frequency of surface-layer instability exhibits significant temporal and spatial variability, being particularly larger in spring and summer than in autumn and winter. The maximum frequency of summertime instability occurs in the time period 1000–1200 local solar time, approximately 2 h earlier than in autumn. Geographically, the peak instability frequency occurs much earlier in the day in north-west China than in other regions, likely owing to the arid and semi-arid land cover. Also noteworthy is the steady increase in instability frequency observed during the period analyzed here, likely resulting from the reduction in the vertical gradient of wind speed. Our findings call for explicit consideration of stability variability in the wind-energy industry and in fundamental boundary-layer investigations in China.

ACS Style

Jian Li; Jianping Guo; Hui Xu; Jing Li; Yanmin Lv. Assessing the Surface-Layer Stability over China Using Long-Term Wind-Tower Network Observations. Boundary-Layer Meteorology 2021, 180, 155 -171.

AMA Style

Jian Li, Jianping Guo, Hui Xu, Jing Li, Yanmin Lv. Assessing the Surface-Layer Stability over China Using Long-Term Wind-Tower Network Observations. Boundary-Layer Meteorology. 2021; 180 (1):155-171.

Chicago/Turabian Style

Jian Li; Jianping Guo; Hui Xu; Jing Li; Yanmin Lv. 2021. "Assessing the Surface-Layer Stability over China Using Long-Term Wind-Tower Network Observations." Boundary-Layer Meteorology 180, no. 1: 155-171.

Journal article
Published: 11 April 2021 in Atmosphere
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In this study, based on the National Centers for Environmental Prediction (NCEP) Final Analysis (FNL) data, the reliability and performances of their application on clean days and polluted days (based on the PM2.5 mass concentrations) in Beijing were assessed. Conventional meteorological factors and diagnostic physical quantities from the NCEP/FNL data were compared with the L-band radar observations in Beijing in the autumns and winters of 2017–2019. The results indicate that the prediction reliability of the temperature was the best compared with those of the relative humidity and wind speed. It is worth noting that the relative humidity was lower and the near-surface wind speed was higher on polluted days from the NCEP/FNL data than from the observations. As far as diagnostic physical quantity is concerned, it was revealed that the temperature inversion intensity depicted by the NCEP/FNL data was significantly lower than that from the observations, especially on polluted days. For example, the difference in the temperature inversion intensity between the NCEP/FNL data and the observation ranged from −0.56 to −0.77 °C on polluted days. In addition, the difference in the wind shears between the NCEP/FNL reanalysis data and the observations increased to 0.40 m/s in the lower boundary layer on polluted days compared with that on clean days. Therefore, it is suggested that the underestimation of the relative humidity and temperature inversion intensity, and the overestimation of the near-surface wind speed should be seriously considered in simulating the air quality in the model, particularly on polluted days, which should be focused on more in future model developments.

ACS Style

Chao Liu; Jianping Guo; Bihui Zhang; Hengde Zhang; Panbo Guan; Ran Xu. A Reliability Assessment of the NCEP/FNL Reanalysis Data in Depicting Key Meteorological Factors on Clean Days and Polluted Days in Beijing. Atmosphere 2021, 12, 481 .

AMA Style

Chao Liu, Jianping Guo, Bihui Zhang, Hengde Zhang, Panbo Guan, Ran Xu. A Reliability Assessment of the NCEP/FNL Reanalysis Data in Depicting Key Meteorological Factors on Clean Days and Polluted Days in Beijing. Atmosphere. 2021; 12 (4):481.

Chicago/Turabian Style

Chao Liu; Jianping Guo; Bihui Zhang; Hengde Zhang; Panbo Guan; Ran Xu. 2021. "A Reliability Assessment of the NCEP/FNL Reanalysis Data in Depicting Key Meteorological Factors on Clean Days and Polluted Days in Beijing." Atmosphere 12, no. 4: 481.

Original paper
Published: 07 April 2021 in Advances in Atmospheric Sciences
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A better knowledge of aerosol properties is of great significance for elucidating the complex mechanisms behind frequently occurring haze pollution events. In this study, we examine the temporal and spatial variations in both PM1 and its major chemical constituents using three-year field measurements that were collected in six representative regions in China between 2012 and 2014. Our results show that both PM1 and its chemical compositions varied significantly in space and time, with high PM1 loadings mainly observed in the winter. By comparing chemical constituents between clean and polluted episodes, we find that the elevated PM1 mass concentration during pollution events should be largely attributable to significant increases in organic matter (OM) and inorganic aerosols like sulfate, nitrate, and ammonium (SNA), indicative of the critical role of primary emissions and secondary aerosols in elevating PM1 pollution levels. The ratios of PM1/PM2.5 are found to be generally high in Shanghai and Guangzhou, while relatively low ratios are seen in Xi’an and Chengdu, indicating anthropogenic emissions were more likely to accumulate in forms of finer particles. With respect to the relative importance of chemical components and meteorological factors quantified via statistical modeling practices, we find that primary emissions and secondary aerosols were the two leading factors contributing to PM1 variations, though meteorological factors also played important roles in regulating the dispersion of atmospheric PM.

ACS Style

Kaixu Bai; Can Wu; Jianjun Li; Ke Li; Jianping Guo; Gehui Wang. Characteristics of Chemical Speciation in PM1 in Six Representative Regions in China. Advances in Atmospheric Sciences 2021, 38, 1101 -1114.

AMA Style

Kaixu Bai, Can Wu, Jianjun Li, Ke Li, Jianping Guo, Gehui Wang. Characteristics of Chemical Speciation in PM1 in Six Representative Regions in China. Advances in Atmospheric Sciences. 2021; 38 (7):1101-1114.

Chicago/Turabian Style

Kaixu Bai; Can Wu; Jianjun Li; Ke Li; Jianping Guo; Gehui Wang. 2021. "Characteristics of Chemical Speciation in PM1 in Six Representative Regions in China." Advances in Atmospheric Sciences 38, no. 7: 1101-1114.

Journal article
Published: 06 April 2021 in Atmospheric Research
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The atmospheric circulation and remote forcing of SST anomalies play an imporant role in the formation of large-scale cloud cover and precipitation anomalies as well as the patterns of diurnal temperature range (DTR) variability. In this study, the dominant patterns of the wintertime DTR variations over North America (NA) and the underlying mechnisms are investigated based on observational and reanalysis datasets during 1979–2018. The first leading mode is characterized by a widespread same-sign loading in the majority of NA. The corresponding principal component (PC) shows an obvious interannual time-scale variations. The second mode displays a north-south dipole-like pattern in the NA and the corresponding PC exhibits a decline trend during 1979–2018. Both patterns of DTR variations are closely associated with the changes in local cloud cover and precipitation. Furthermore, clear effects are identified of El Niño-Southern Oscillation (ENSO) and Tropical/Northern Hemisphere (TNH) teleconnection on the formation of the two dominant patterns of wintertime DTR variabilty over NA through changing the atmospheric circulation and associated transportation of temperature and moisture. Our findings provide a new insight into understanding the DTR changes during recent decades.

ACS Style

Lin Liu; Wen Chen; Jianping Guo; Renguang Wu; Lin Wang; Shanshan Wang; Yanfeng Huo; Weichen Tao. Large-scale pattern of the wintertime diurnal temperature range variations over North America during 1979–2018. Atmospheric Research 2021, 257, 105614 .

AMA Style

Lin Liu, Wen Chen, Jianping Guo, Renguang Wu, Lin Wang, Shanshan Wang, Yanfeng Huo, Weichen Tao. Large-scale pattern of the wintertime diurnal temperature range variations over North America during 1979–2018. Atmospheric Research. 2021; 257 ():105614.

Chicago/Turabian Style

Lin Liu; Wen Chen; Jianping Guo; Renguang Wu; Lin Wang; Shanshan Wang; Yanfeng Huo; Weichen Tao. 2021. "Large-scale pattern of the wintertime diurnal temperature range variations over North America during 1979–2018." Atmospheric Research 257, no. : 105614.

Journal article
Published: 24 March 2021 in Journal of Environmental Management
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A better knowledge of surface ozone variations and the relevant influential factors is of great significance for controlling frequent ozone pollution events. In this study, we first examined the primary variation patterns of surface ozone in space and time across China via a clustering analysis on the basis of daily maximum 8h average surface ozone (MDA8) between 2015 and 2018. Statistical models were then established between MDA8 and a set of influential factors to pinpoint dominant factors contributing to regional MDA8 variations. The clustering results revealed four typical variation patterns of MDA8 in China given distinct pollution levels, seasonality, and long-term trends. Statistical modeling results indicated that the seasonal variability of MDA8 was closely associated with UV radiation and meteorological factors like boundary layer height, temperature and relative humidity. In contrast, the long-term trends of MDA8 were largely linked to ozone precursors and meteorological variables including temperature, relative humidity, and total cloud cover. Moreover, the phenomenal increasing trends of MDA8 in North China were found to be statistically associated with the depletion of nitrogen dioxide (NO2) and carbon monoxide (CO). Specifically, substantial increases in volatile organic compounds (VOCs) along with depletions in NO2 and CO significantly boosted the photochemical ozone formation chain process in a VOC-limited regime like the North China plain. Overall, the inferred linkage in this study provides evidence and clues to help control increasing ozone pollution events in North China.

ACS Style

Mingliang Ma; Guobiao Yao; Jianping Guo; Kaixu Bai. Distinct spatiotemporal variation patterns of surface ozone in China due to diverse influential factors. Journal of Environmental Management 2021, 288, 112368 .

AMA Style

Mingliang Ma, Guobiao Yao, Jianping Guo, Kaixu Bai. Distinct spatiotemporal variation patterns of surface ozone in China due to diverse influential factors. Journal of Environmental Management. 2021; 288 ():112368.

Chicago/Turabian Style

Mingliang Ma; Guobiao Yao; Jianping Guo; Kaixu Bai. 2021. "Distinct spatiotemporal variation patterns of surface ozone in China due to diverse influential factors." Journal of Environmental Management 288, no. : 112368.

Journal article
Published: 23 March 2021 in Atmospheric Research
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Regional raindrop size distribution (DSD) features are poorly understood due to the lack of observations. Here we investigate the regional variability of summertime DSD in Beijing, using the DSD observations from ten disdrometer sites from April to September 2017. The characteristics of DSD are analyzed for both convective and stratiform precipitation, mainly classified by rain rate (R). The shape (μ) and slope (λ) parameters follow a second-degree polynomial regression relationship for both stratiform and convective precipitation. On average, stratiform precipitation is found to have larger values of μ and λ than convective precipitation, whereas convective precipitation has a larger mass-weighted mean diameter (Dm) and a generalized intercept parameter (Nw). Interestingly, the north of Beijing has larger values of μ and λ, as opposed to Dm and Nw that exhibit greater values in the south, which could probably be attributed to terrain differences. The rain rate dependence on DSD is analyzed as well. In general, the Dm-R and Nw-R relationships follow a power-law distribution, and both Dm and Nw increase significantly with R. As the rain rate increases, Dm keeps increasing to around 1.5 mm until an equilibrium state is reached. The findings obtained here could provide useful reference for better estimations of rainfall using the remote sensing techniques.

ACS Style

Yi Han; Jianping Guo; Yuxing Yun; Jian Li; Xiaoran Guo; Yanmin Lv; Ding Wang; Lin Li; Yong Zhang. Regional variability of summertime raindrop size distribution from a network of disdrometers in Beijing. Atmospheric Research 2021, 257, 105591 .

AMA Style

Yi Han, Jianping Guo, Yuxing Yun, Jian Li, Xiaoran Guo, Yanmin Lv, Ding Wang, Lin Li, Yong Zhang. Regional variability of summertime raindrop size distribution from a network of disdrometers in Beijing. Atmospheric Research. 2021; 257 ():105591.

Chicago/Turabian Style

Yi Han; Jianping Guo; Yuxing Yun; Jian Li; Xiaoran Guo; Yanmin Lv; Ding Wang; Lin Li; Yong Zhang. 2021. "Regional variability of summertime raindrop size distribution from a network of disdrometers in Beijing." Atmospheric Research 257, no. : 105591.

Preprint content
Published: 11 March 2021
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Mid-latitude mixed-phase stratocumulus clouds and their interactions with aerosols remain poorly understood. This study examines the roles of ice processes in those clouds and interactions using a large-eddy simulation (LES) framework. Cloud mass becomes much lower in the presence of ice processes and the Wegener-Bergeron-Findeisen (WBF) mechanism in the mixed-phase clouds as compared to that in warm clouds. This is because while the WBF mechanism enhances the evaporation of droplets, the low concentration of aerosols as ice nuclei (IN) and cloud ice number concentration (CINC) prevent the efficient deposition of water vapor whose mass is contributed by the evaporation. In the mixed-phase clouds, the increasing concentration of aerosols that act as cloud condensation nuclei (CCN) decreases cloud mass by increasing the evaporation of droplets through the WBF mechanism and decreasing the intensity of updrafts. In contrast to this, in the warm clouds, the absence of the WBF mechanism makes the increase in the evaporation of droplets inefficient, eventually enabling cloud mass to increase with the increasing concentration of aerosols as CCN. Here, the results show that when there is an increasing concentration of aerosols that act as IN, the deposition of water vapor is more efficient than when there is the increasing concentration of aerosols as CCN, which in turn enables cloud mass to increase in the mixed-phase clouds.

ACS Style

Seoung Soo Lee; Kyung-Ja Ha; Manguttathil Gopalakrishnan Manoj; Mohammad Kamruzzaman; Hyungjun Kim; Nobuyuki Utsumi; Jianping Guo. Mid-latitude mixed-phase stratocumulus clouds and their interactions with aerosols: how ice processes affect microphysical, dynamic and thermodynamic development in those clouds and interactions? 2021, 2021, 1 -65.

AMA Style

Seoung Soo Lee, Kyung-Ja Ha, Manguttathil Gopalakrishnan Manoj, Mohammad Kamruzzaman, Hyungjun Kim, Nobuyuki Utsumi, Jianping Guo. Mid-latitude mixed-phase stratocumulus clouds and their interactions with aerosols: how ice processes affect microphysical, dynamic and thermodynamic development in those clouds and interactions? . 2021; 2021 ():1-65.

Chicago/Turabian Style

Seoung Soo Lee; Kyung-Ja Ha; Manguttathil Gopalakrishnan Manoj; Mohammad Kamruzzaman; Hyungjun Kim; Nobuyuki Utsumi; Jianping Guo. 2021. "Mid-latitude mixed-phase stratocumulus clouds and their interactions with aerosols: how ice processes affect microphysical, dynamic and thermodynamic development in those clouds and interactions?" 2021, no. : 1-65.