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Dr. SHU WU
Center for Climatic Research, University of Wisconsin-Madison

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Research Keywords & Expertise

0 Climate Modeling
0 Data Assimilation
0 Forecasting Models
0 Oceanography
0 Extreme events

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Article
Published: 16 August 2013 in Advances in Atmospheric Sciences
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A conceptual coupled ocean-atmosphere model was used to study coupled ensemble data assimilation schemes with a focus on the role of ocean-atmosphere interaction in the assimilation. The optimal scheme was the fully coupled data assimilation scheme that employs the coupled covariance matrix and assimilates observations in both the atmosphere and ocean. The assimilation of synoptic atmospheric variability that captures the temporal fluctuation of the weather noise was found to be critical for the estimation of not only the atmospheric, but also oceanic states. The synoptic atmosphere observation was especially important in the mid-latitude system, where oceanic variability is driven by weather noise. The assimilation of synoptic atmospheric variability in the coupled model improved the atmospheric variability in the analysis and the subsequent forecasts, reducing error in the surface forcing and, in turn, in the ocean state. Atmospheric observation was able to further improve the oceanic state estimation directly through the coupled covariance between the atmosphere and ocean states. Relative to the mid-latitude system, the tropical system was influenced more by ocean-atmosphere interaction and, thus, the assimilation of oceanic observation becomes more important for the estimation of the ocean and atmosphere.

ACS Style

Zhengyu Liu; Shu Wu; Shaoqing Zhang; Yun Liu; Xinyao Rong. Ensemble data assimilation in a simple coupled climate model: The role of ocean-atmosphere interaction. Advances in Atmospheric Sciences 2013, 30, 1235 -1248.

AMA Style

Zhengyu Liu, Shu Wu, Shaoqing Zhang, Yun Liu, Xinyao Rong. Ensemble data assimilation in a simple coupled climate model: The role of ocean-atmosphere interaction. Advances in Atmospheric Sciences. 2013; 30 (5):1235-1248.

Chicago/Turabian Style

Zhengyu Liu; Shu Wu; Shaoqing Zhang; Yun Liu; Xinyao Rong. 2013. "Ensemble data assimilation in a simple coupled climate model: The role of ocean-atmosphere interaction." Advances in Atmospheric Sciences 30, no. 5: 1235-1248.

Journal article
Published: 15 February 2011 in Journal of Oceanography
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ACS Style

Shu Wu; Zhengyu Liu; Rong Zhang; Thomas Delworth. On the observed relationship between the Pacific Decadal Oscillation and the Atlantic Multi-decadal Oscillation. Journal of Oceanography 2011, 67, 27 -35.

AMA Style

Shu Wu, Zhengyu Liu, Rong Zhang, Thomas Delworth. On the observed relationship between the Pacific Decadal Oscillation and the Atlantic Multi-decadal Oscillation. Journal of Oceanography. 2011; 67 (1):27-35.

Chicago/Turabian Style

Shu Wu; Zhengyu Liu; Rong Zhang; Thomas Delworth. 2011. "On the observed relationship between the Pacific Decadal Oscillation and the Atlantic Multi-decadal Oscillation." Journal of Oceanography 67, no. 1: 27-35.

Article
Published: 29 December 2009 in Advances in Atmospheric Sciences
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Mechanisms for the spatio-temporal development of the Tropical Pacific Meridional Mode (TPMM) are investigated using a coupled ocean-atmosphere model and observations. In both observations and the model, this meridional mode displays decadal variations and is most pronounced in spring and early summer. The model simulation suggests that once SST anomalies in the subtropical northeastern Pacific are initiated, say by northeasterly trade wind variability, perturbations evolve into a merdional dipole in 2–3 months. A wind-evaporative-SST feedback causes a southwestward propagation of initial subtropical SST anomalies, while anomalous equatorial upwelling helps form the southern lobe of the meridional dipole. The TPMM development is a fast process (a few months) and depends on the seasonal cycle.

ACS Style

Shu Wu; Lixin Wu; Qinyu Liu; Shang-Ping Xie. Development processes of the Tropical Pacific Meridional Mode. Advances in Atmospheric Sciences 2009, 27, 95 -99.

AMA Style

Shu Wu, Lixin Wu, Qinyu Liu, Shang-Ping Xie. Development processes of the Tropical Pacific Meridional Mode. Advances in Atmospheric Sciences. 2009; 27 (1):95-99.

Chicago/Turabian Style

Shu Wu; Lixin Wu; Qinyu Liu; Shang-Ping Xie. 2009. "Development processes of the Tropical Pacific Meridional Mode." Advances in Atmospheric Sciences 27, no. 1: 95-99.