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Dr. Diamando Vlachogiannis
National Centre for Scientific Research "Demokritos"

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0 Atmosphere
0 Modelling
0 Regional Studies
0 Enviromental Assessment
0 climate change and impacts

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Journal article
Published: 04 May 2021 in Sustainability
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Safety in touristic destinations is of utmost importance since tourists’ preferences change frequently in response to emerging threats. Natural hazards are a significant risk and, as such, they need to be considered in the effort for safe tourism. Services and systems monitoring and predicting extreme natural phenomena and disasters in sites of special tourist and cultural interest can lead to more effective risk management and incident response. This paper presents Xenios, a system under development in Greece that provides early warning and risk communication services via web-based and mobile phone applications. We present the user requirements analysis contacted, which led to the design of a modular system architecture through a formal Business Process Model procedure. Currently, early warning systems for wildfire, floods, and extreme weather events are offered, based on a fusion of information from satellite imagery, meteorological forecasts, and risk estimation models. Moreover, visitors’ dispersion monitoring via unmanned aerial vehicles (UAVs) and Wi-Fi connection signals is also offered, along with emergency response planning and ticketing system’s interfacing. The system is built around a modular architecture that permits the easy integration of new subsystems or other danger forecasting modules, depending on the site’s actual needs and limitations. Xenios also provides a mobile app for site visitors, which establishes a communication link for sending alarms, but also serves them with useful tourist information, so that they are encouraged to download and use the app. Finally, the opportunities for supporting a viable business model are also discussed. The results of this study could prove useful in designing other natural risk management systems for sites of cultural and natural interest.

ACS Style

Chrysostomos Psaroudakis; Gavriil Xanthopoulos; Dimitris Stavrakoudis; Antonios Barnias; Vassiliki Varela; Ilias Gkotsis; Anna Karvouniari; Spyridon Agorgianitis; Ioannis Chasiotis; Diamando Vlachogiannis; Athanasios Sfetsos; Konstantinos Kaoukis; Aikaterini Christopoulou; Petros Antakis; Ioannis Gitas. Development of an Early Warning and Incident Response System for the Protection of Visitors from Natural Hazards in Important Outdoor Sites in Greece. Sustainability 2021, 13, 5143 .

AMA Style

Chrysostomos Psaroudakis, Gavriil Xanthopoulos, Dimitris Stavrakoudis, Antonios Barnias, Vassiliki Varela, Ilias Gkotsis, Anna Karvouniari, Spyridon Agorgianitis, Ioannis Chasiotis, Diamando Vlachogiannis, Athanasios Sfetsos, Konstantinos Kaoukis, Aikaterini Christopoulou, Petros Antakis, Ioannis Gitas. Development of an Early Warning and Incident Response System for the Protection of Visitors from Natural Hazards in Important Outdoor Sites in Greece. Sustainability. 2021; 13 (9):5143.

Chicago/Turabian Style

Chrysostomos Psaroudakis; Gavriil Xanthopoulos; Dimitris Stavrakoudis; Antonios Barnias; Vassiliki Varela; Ilias Gkotsis; Anna Karvouniari; Spyridon Agorgianitis; Ioannis Chasiotis; Diamando Vlachogiannis; Athanasios Sfetsos; Konstantinos Kaoukis; Aikaterini Christopoulou; Petros Antakis; Ioannis Gitas. 2021. "Development of an Early Warning and Incident Response System for the Protection of Visitors from Natural Hazards in Important Outdoor Sites in Greece." Sustainability 13, no. 9: 5143.

Journal article
Published: 21 January 2021 in Infrastructures
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The present work introduces a case study on the climate resilience of interconnected critical infrastructures to forest fires, that was performed within the framework on H2020 EU-CIRCLE project (GA 653824). It was conducted in South France, one of the most touristic European regions, and also one of the regions at the highest forest fire risk that is projected to be amplified under future climate conditions. The case study has been implemented through a co-creation framework with local stakeholders, which is critical in moving beyond physical damages to the infrastructures, introducing the elements of infrastructure business continuity and societal resilience. Future forest fires extremes are anticipated to impact the interconnections of electricity and transportation networks that could further cascade to communities throughout South France. The work highlighted the benefits of enhancing co-operation between academia, emergency responders, and infrastructure operators as a critical element in enhancing resilience through increased awareness of climate impacts, new generated knowledge on fire extremes and better cooperation between involved agencies.

ACS Style

Athanasios Sfetsos; Frederique Giroud; Alice Clemencau; Vassiliki Varela; Catherine Freissinet; Jean Lecroart; Diamando Vlachogiannis; Nadia Politi; Stelios Karozis; Ilias Gkotsis; George Eftychidis; Ralf Hedel; Stefan Hahmann. Assessing the Effects of Forest Fires on Interconnected Critical Infrastructures under Climate Change. Evidence from South France. Infrastructures 2021, 6, 16 .

AMA Style

Athanasios Sfetsos, Frederique Giroud, Alice Clemencau, Vassiliki Varela, Catherine Freissinet, Jean Lecroart, Diamando Vlachogiannis, Nadia Politi, Stelios Karozis, Ilias Gkotsis, George Eftychidis, Ralf Hedel, Stefan Hahmann. Assessing the Effects of Forest Fires on Interconnected Critical Infrastructures under Climate Change. Evidence from South France. Infrastructures. 2021; 6 (2):16.

Chicago/Turabian Style

Athanasios Sfetsos; Frederique Giroud; Alice Clemencau; Vassiliki Varela; Catherine Freissinet; Jean Lecroart; Diamando Vlachogiannis; Nadia Politi; Stelios Karozis; Ilias Gkotsis; George Eftychidis; Ralf Hedel; Stefan Hahmann. 2021. "Assessing the Effects of Forest Fires on Interconnected Critical Infrastructures under Climate Change. Evidence from South France." Infrastructures 6, no. 2: 16.

Journal article
Published: 31 October 2020 in Forests
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This work introduces a methodology for assessing near-future fire weather pattern changes based on the Canadian Fire Weather Index system components (Fire Weather Index (FWI), Initial Spread Index (ISI), Fire Severity Rating (FSR)), applied in touristic areas in Greece. Four series of daily raster-based datasets for the fire seasons (May–October), concerning a historic (2006 to 2015) and a future climatology period (2036–2045), were created for the areas under consideration, based on high-resolution climate modelling with the Representative Concentration Pathway (RCP), PCR 4.5 and RCP 8.5 scenarios. The climate model data were obtained from the European Coordinated Downscaling Experiment (EURO-CORDEX) climate database and consisted of atmospheric variables as required by the FWI system, at 12.5 km spatial resolution. The final datasets of the abovementioned variables used for the study were processed at 5 km spatial resolution for the domain of interest after applying regridding based on the nearest neighbour interpolating process. Geographic Information Systems (GIS) spatial operations, including spatial statistics and zonal analyses, were applied on the series of the derived daily raster maps in order to provide a number of output thematic layers. Moreover, historic FWI percentile values, which were estimated for Greece in the frame of a past research study of the Environmental Research Laboratory (EREL), were used as reference data for further evaluation of future fire weather changes. The straightforward methodology for the assessment of the evolution of spatial and temporal distribution of Fire weather Danger due to climate change presented herewith is an essential tool for enhancing the knowledge for the decision support process for forest fire prevention, planning and management policies in areas where the fire risk both in terms of fire hazard likelihood and expected impact is quite important due to human presence and cultural prestige, such as archaeological and tourist protected areas.

ACS Style

Vassiliki Varela; Diamando Vlachogiannis; Athanasios Sfetsos; Nadia Politi; Stelios Karozis. Methodology for the Study of Near-Future Changes of Fire Weather Patterns with Emphasis on Archaeological and Protected Touristic Areas in Greece. Forests 2020, 11, 1168 .

AMA Style

Vassiliki Varela, Diamando Vlachogiannis, Athanasios Sfetsos, Nadia Politi, Stelios Karozis. Methodology for the Study of Near-Future Changes of Fire Weather Patterns with Emphasis on Archaeological and Protected Touristic Areas in Greece. Forests. 2020; 11 (11):1168.

Chicago/Turabian Style

Vassiliki Varela; Diamando Vlachogiannis; Athanasios Sfetsos; Nadia Politi; Stelios Karozis. 2020. "Methodology for the Study of Near-Future Changes of Fire Weather Patterns with Emphasis on Archaeological and Protected Touristic Areas in Greece." Forests 11, no. 11: 1168.

Journal article
Published: 18 July 2020 in Atmosphere
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In the context of climate change and growing energy demand, solar technologies are considered promising solutions to mitigate Greenhouse Gas (GHG) emissions and support sustainable adaptation. In Greece, solar power is the second major renewable energy, constituting an increasingly important component of the future low-carbon energy portfolio. In this work, we propose the use of a high-resolution regional climate model (Weather Research and Forecasting model, WRF) to generate a solar climate atlas for the near-term climatological future under the Representative Concentration Pathway (RCPs) 4.5 and 8.5 scenarios. The model is set up with a 5 × 5 km2 spatial resolution, forced by the ERA-INTERIM for the historic (1980–2004) period and by the EC-EARTH General Circulation Models (GCM) for the future (2020–2044). Results reaffirm the high quality of solar energy potential in Greece and highlight the ability of the WRF model to produce a highly reliable future climate solar atlas. Projected changes between the annual historic and future RCPs scenarios indicate changes of the annual Global Horizontal Irradiance (GHI) in the range of ±5.0%. Seasonal analysis of the GHI values indicates percentage changes in the range of ±12% for both scenarios, with winter exhibiting the highest seasonal increases in the order of 10%, and autumn the largest decreases. Clear-sky fraction fclear projects increases in the range of ±4.0% in eastern and north continental Greece in the future, while most of the Greek marine areas might expect above 220 clear-sky days per year.

ACS Style

Theodoros Katopodis; Iason Markantonis; Nadia Politi; Diamando Vlachogiannis; Athanasios Sfetsos. High-Resolution Solar Climate Atlas for Greece under Climate Change Using the Weather Research and Forecasting (WRF) Model. Atmosphere 2020, 11, 761 .

AMA Style

Theodoros Katopodis, Iason Markantonis, Nadia Politi, Diamando Vlachogiannis, Athanasios Sfetsos. High-Resolution Solar Climate Atlas for Greece under Climate Change Using the Weather Research and Forecasting (WRF) Model. Atmosphere. 2020; 11 (7):761.

Chicago/Turabian Style

Theodoros Katopodis; Iason Markantonis; Nadia Politi; Diamando Vlachogiannis; Athanasios Sfetsos. 2020. "High-Resolution Solar Climate Atlas for Greece under Climate Change Using the Weather Research and Forecasting (WRF) Model." Atmosphere 11, no. 7: 761.

Journal article
Published: 16 March 2020 in Climate
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In the present study, the ability of the Advanced Weather Research and Forecasting numerical model (WRF-ARW) to perform climate regionalization studies in the topographically complex region of Greece, was examined in order to explore the possibility of a more reliable selection of physical schemes for the simulation of historical and future high resolution (5 km) climate model experiments to investigate the impact of climate change. This work is directly linked to a previous study investigating the performance of seven different model setups for one year, from which the need was derived for further examination of four different simulations to investigate the model sensitivity on the representation of surface variables statistics during a 5-year period. The results have been compared with observational data for maximum and minimum air temperature and daily precipitation through statistical analysis. Clear similarities were found in precipitation patterns among simulations and observations, yielding smoothly its inter-annual variability, especially during the wettest months and summer periods, with the lowest positive percentage BIAS calculated at about 19% for the selected combination of physics parameterizations (PP3). Regarding the maximum and minimum temperature, statistical analysis showed a high correlation above 0.9, and negative bias around 1−1.5 °C, and positive bias near 2 °C, respectively.

ACS Style

Nadia Politi; Athanasios Sfetsos; Diamando Vlachogiannis; Panagiotis T. Nastos; Stylianos Karozis. A Sensitivity Study of High-Resolution Climate Simulations for Greece. Climate 2020, 8, 44 .

AMA Style

Nadia Politi, Athanasios Sfetsos, Diamando Vlachogiannis, Panagiotis T. Nastos, Stylianos Karozis. A Sensitivity Study of High-Resolution Climate Simulations for Greece. Climate. 2020; 8 (3):44.

Chicago/Turabian Style

Nadia Politi; Athanasios Sfetsos; Diamando Vlachogiannis; Panagiotis T. Nastos; Stylianos Karozis. 2020. "A Sensitivity Study of High-Resolution Climate Simulations for Greece." Climate 8, no. 3: 44.

Journal article
Published: 01 November 2019 in Journal of Renewable and Sustainable Energy
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Wind technology is projected to play a key role in mitigating climate change effects and contributing to the reduction of CO2 emissions, but its sustainability critically depends on current and future climate conditions. In this study, the climate change impacts on wind resources and wind energy potential in Greece are assessed, yielding a wealth of information that could be used by stakeholders. A detailed evaluation of future wind characteristics over Greece is carried out using EURO-CORDEX RCA4 model data with a horizontal resolution of ∼12 km, taking into consideration future RCP scenarios for the short term decadal climatology of 2040, which is the expected end-life of installed wind turbines. The RCA4 model demonstrated accurate performance when compared to actual observational data from the HNMS network, thus allowing higher confidence in assessments of future periods. Future projections revealed changes in the mean wind speed of the order of ±5% that did not vary significantly for the different RCP scenarios, although on a monthly basis that variability could reach ±20%. Decadal changes in the mean wind potential were of the order of ±15% for the two RCPs (2.6 and 8.5). Wind gusts exceeding 52 m/s, linked to the wind turbine structural integrity and robust performance, appeared more frequently in RCP 8.5 by about 2–4 times per decade, affecting mostly the South Ionian Sea. The findings also indicate a tendency for calming of the “Etesians” winds over the Aegean Sea in future summers.

ACS Style

Theodoros Katopodis; Diamando Vlachogiannis; Nadia Politi; Nikolaos Gounaris; Stelios Karozis; Athanasios Sfetsos. Assessment of climate change impacts on wind resource characteristics and wind energy potential in Greece. Journal of Renewable and Sustainable Energy 2019, 11, 066502 .

AMA Style

Theodoros Katopodis, Diamando Vlachogiannis, Nadia Politi, Nikolaos Gounaris, Stelios Karozis, Athanasios Sfetsos. Assessment of climate change impacts on wind resource characteristics and wind energy potential in Greece. Journal of Renewable and Sustainable Energy. 2019; 11 (6):066502.

Chicago/Turabian Style

Theodoros Katopodis; Diamando Vlachogiannis; Nadia Politi; Nikolaos Gounaris; Stelios Karozis; Athanasios Sfetsos. 2019. "Assessment of climate change impacts on wind resource characteristics and wind energy potential in Greece." Journal of Renewable and Sustainable Energy 11, no. 6: 066502.

Journal article
Published: 08 August 2019 in Sustainability
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Fire occurrence and behaviour in Mediterranean-type ecosystems strongly depend on the air temperature and wind conditions, the amount of fuel load and the drought conditions that drastically increase flammability, particularly during the summer period. In order to study the fire danger due to climate change for these ecosystems, the meteorologically based Fire Weather Index (FWI) can be used. The Fire Weather Index (FWI) system, which is part of the Canadian Forest Fire Danger Rating System (CFFDRS), has been validated and recognized worldwide as one of the most trusted and important indicators for meteorological fire danger mapping. A number of FWI system components (Fire Weather Index, Drought Code, Initial Spread Index and Fire Severity Rating) were estimated and analysed in the current study for the Mediterranean area of France. Daily raster-based data-sets for the fire seasons (1st May–31st October) of a historic and a future time period were created for the study area based on representative concentration pathway (RCP) 4.5 and RCP 8.5 scenarios, outputs of CNRM-SMHI and MPI-SMHI climate models. GIS spatial analyses were applied on the series of the derived daily raster maps in order to provide a number of output maps for the study area. The results portray various levels of changes in fire danger, in the near future, according to the examined indices. Number of days with high and very high FWI values were found to be doubled compared to the historical period, in particular in areas of the Provence-Alpes-Côte d’Azur (PACA) region and Corsica. The areas with high Initial Spread Index and Seasonal Spread Index values increased as well, forming compact zones of high fire danger in the southern part of the study area, while the Drought Code index did not show remarkable changes. The current study on the evolution of spatial and temporal distribution of forest fire danger due to climate change can provide important knowledge to the decision support process for prevention and management policies of forest fires both at a national and EU level.

ACS Style

Vassiliki Varela; Diamando Vlachogiannis; Athanasios Sfetsos; Stelios Karozis; Nadia Politi; Frédérique Giroud. Projection of Forest Fire Danger due to Climate Change in the French Mediterranean Region. Sustainability 2019, 11, 4284 .

AMA Style

Vassiliki Varela, Diamando Vlachogiannis, Athanasios Sfetsos, Stelios Karozis, Nadia Politi, Frédérique Giroud. Projection of Forest Fire Danger due to Climate Change in the French Mediterranean Region. Sustainability. 2019; 11 (16):4284.

Chicago/Turabian Style

Vassiliki Varela; Diamando Vlachogiannis; Athanasios Sfetsos; Stelios Karozis; Nadia Politi; Frédérique Giroud. 2019. "Projection of Forest Fire Danger due to Climate Change in the French Mediterranean Region." Sustainability 11, no. 16: 4284.

Journal article
Published: 31 July 2015 in Atmosphere
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The contribution of different anthropogenic source-sectors on ozone mixing ratios and PM2.5 concentrations over Europe is assessed for a summer month (July 2006) using the US Environmental Protection Agency’s (EPA’s) Models-3 framework and the Netherlands Organization for Applied Scientific Research (TNO) anthropogenic emissions for 2006. Anthropogenic emission sources have been classified into 10 different Standard Nomenclature for Air Pollution (SNAP) categories. The road transport category, which is mainly responsible for NOX emissions, is estimated to have the major impact on Max8hrO3 mixing ratio suggesting an increase of 6.8% on average over Europe, while locally it is more than 20%. Power generation category is estimated to have the major impact on PM2.5 concentrations since it is the major source of SO2 emissions, suggesting an increase of 22.9% on average over Europe, while locally it is more than 60%. Agriculture category is also contributing significantly on PM2.5 concentrations, since agricultural activities are the major source of NH3 emissions, suggesting an increased by 16.1% on average over Europe, while in regions with elevated NH3 emissions the increase is up to 40%.

ACS Style

Efthimios Tagaris; Rafaella Eleni P. Sotiropoulou; Nikos Gounaris; Spyros Andronopoulos; Diamando Vlachogiannis. Effect of the Standard Nomenclature for Air Pollution (SNAP) Categories on Air Quality over Europe. Atmosphere 2015, 6, 1119 -1128.

AMA Style

Efthimios Tagaris, Rafaella Eleni P. Sotiropoulou, Nikos Gounaris, Spyros Andronopoulos, Diamando Vlachogiannis. Effect of the Standard Nomenclature for Air Pollution (SNAP) Categories on Air Quality over Europe. Atmosphere. 2015; 6 (8):1119-1128.

Chicago/Turabian Style

Efthimios Tagaris; Rafaella Eleni P. Sotiropoulou; Nikos Gounaris; Spyros Andronopoulos; Diamando Vlachogiannis. 2015. "Effect of the Standard Nomenclature for Air Pollution (SNAP) Categories on Air Quality over Europe." Atmosphere 6, no. 8: 1119-1128.

Journal article
Published: 01 October 2013 in The Journal of Supercritical Fluids
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ACS Style

Athanasios Papadopoulos; Diamando Vlachogiannis; Thomas Maggos; Athanasios Sfetsos; Miltiades I. Karayiannis. A semi-quantitative approach for analysing low-volatile organic compounds in house dust using an SFE method: Significant common features and particular differences of the extracts. The Journal of Supercritical Fluids 2013, 82, 268 -281.

AMA Style

Athanasios Papadopoulos, Diamando Vlachogiannis, Thomas Maggos, Athanasios Sfetsos, Miltiades I. Karayiannis. A semi-quantitative approach for analysing low-volatile organic compounds in house dust using an SFE method: Significant common features and particular differences of the extracts. The Journal of Supercritical Fluids. 2013; 82 ():268-281.

Chicago/Turabian Style

Athanasios Papadopoulos; Diamando Vlachogiannis; Thomas Maggos; Athanasios Sfetsos; Miltiades I. Karayiannis. 2013. "A semi-quantitative approach for analysing low-volatile organic compounds in house dust using an SFE method: Significant common features and particular differences of the extracts." The Journal of Supercritical Fluids 82, no. : 268-281.

Journal article
Published: 01 July 2013 in Atmospheric Pollution Research
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Air pollution in urban areas is a topic of interest for many researchers as it impacts negatively the human health, the environment and the quality of life. As part of the effort in exploring ways for efficient and timely assessment of the urban air pollution patterns and their association with the local meteorology and photochemistry, an advanced statistical approach is proposed for the analysis of the spatiotemporal ozone (O3) variations and interdependencies to other pollutants. The focus of the work is placed on the investigation and determination of the causality between the local and regional factors causing the observed ozone variability, by applying a holistic methodology on multiple–year meteorological data and air pollution monitoring data, referenced in Athens (Greece). The methodology includes the Positive Matrix Factorization (PMF), for data scaling and reduction, a k–means clustering algorithm, for determining groups of data with common properties, and importantly, the Granger Causality test, for obtaining the causal links between the ozone and nitrogen oxides as well as the local meteorological conditions. The methodology revealed six dominant combined patterns of weather and air pollution. The application of the Granger Causality allowed the determination of relationships across the pollution patterns of dispersed geographic locations and the interdependence of those with the local meteorological conditions and photochemistry effects

ACS Style

Athanasios Sfetsos; Diamando Vlachogiannis. An analysis of ozone variation in the Greater Athens Area using Granger Causality. Atmospheric Pollution Research 2013, 4, 290 -297.

AMA Style

Athanasios Sfetsos, Diamando Vlachogiannis. An analysis of ozone variation in the Greater Athens Area using Granger Causality. Atmospheric Pollution Research. 2013; 4 (3):290-297.

Chicago/Turabian Style

Athanasios Sfetsos; Diamando Vlachogiannis. 2013. "An analysis of ozone variation in the Greater Athens Area using Granger Causality." Atmospheric Pollution Research 4, no. 3: 290-297.

Journal article
Published: 01 January 2013 in Atmospheric and Climate Sciences
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Adjoint sensitivity analysis allows to assess the areas that have the largest impact on a given receptor site. The adjoint version of the Community Multiscale Air Quality (CMAQ v4.5) model was employed to perform a sensitivity analysis of ground level ozone for the episodic event of June 24, 2003, in the city of Athens assuming as a receptor site that of Agia Paraskevi Station. The 3-dimensional meteorology fields calculated using the Mesoscale Model 5 (MM5, Penn State University version 3.7.2) were used to produce high resolution daily air emissions inventories for the main anthropogenic and biogenic pollutants with 1-hour time step by an in-house built processor named EMISLAB. The meteorological prediction fields in combination with the emissions inventories were consequently fed as inputs to the CMAQ model. The ozone sensitivities were obtained with respect to pollutant concentrations and emissions. The distribution of the sensitivities in the computational domain for different times delineated the regions where perturbations in some concentrations would result in significant changes in the ozone concentrations in the area of interest (Agia Paraskevi, in this case) at the final time. The investigation yielded that the most significant influences were the transported O3 and NOx concentrations from the industrial area in the northern parts of the city and the road traffic from the city centre.

ACS Style

Athanasios Sfetsos; Diamando Vlachogiannis; Nikolaos Gounaris. An Investigation of the Factors Affecting the Ozone Concentrations in an Urban Environment. Atmospheric and Climate Sciences 2013, 03, 11 -17.

AMA Style

Athanasios Sfetsos, Diamando Vlachogiannis, Nikolaos Gounaris. An Investigation of the Factors Affecting the Ozone Concentrations in an Urban Environment. Atmospheric and Climate Sciences. 2013; 03 (01):11-17.

Chicago/Turabian Style

Athanasios Sfetsos; Diamando Vlachogiannis; Nikolaos Gounaris. 2013. "An Investigation of the Factors Affecting the Ozone Concentrations in an Urban Environment." Atmospheric and Climate Sciences 03, no. 01: 11-17.

Journal article
Published: 01 January 2012 in International Journal of Environment and Pollution
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The heavy urbanisation of great cities has caused immense concern to societies due to air quality degradation and adverse changes in local climates such as abnormally high temperatures. Due to the growing demand for renewable energy resources and electrical power generation, the installation of photovoltaic (PV) panels on building roofs and other available open spaces has advanced in the recent years. Such applications are translated to land use and land cover modifications with respect to the existing situation. This work attempts to investigate the application of PVs in the city of Athens (Greece) and estimate computationally the subsequent results in maximum temperatures and wind velocities mainly during hot weather events. Those events were identified using meteorological data available from the National Centres for Environmental Prediction (NCEP) global forecasting system (GFS). Land use changes due to photovoltaic canopies have been translated into changes in surface albedo and roughness, specific heat capacities, thermal properties and evapo-transpiration in the input files of the domain of Athens (1 × 1 km²) of the modelling system (Mesoscale Model 5, MM5). The model results revealed noticeable changes in the temperature and wind fields when applying the scenario of installing PV panels in the urban canopy of the city.

ACS Style

Diamando Vlachogiannis; Athanasios Sfetsos; Nikolaos Gounaris; Athanasios Papadopoulos. Computational study of the effects of induced land use changes on meteorological patterns during hot weather events in an urban environment. International Journal of Environment and Pollution 2012, 50, 460 .

AMA Style

Diamando Vlachogiannis, Athanasios Sfetsos, Nikolaos Gounaris, Athanasios Papadopoulos. Computational study of the effects of induced land use changes on meteorological patterns during hot weather events in an urban environment. International Journal of Environment and Pollution. 2012; 50 (1/2/3/4):460.

Chicago/Turabian Style

Diamando Vlachogiannis; Athanasios Sfetsos; Nikolaos Gounaris; Athanasios Papadopoulos. 2012. "Computational study of the effects of induced land use changes on meteorological patterns during hot weather events in an urban environment." International Journal of Environment and Pollution 50, no. 1/2/3/4: 460.

Journal article
Published: 01 January 2011 in International Journal of Environment and Pollution
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The factors affecting ground level ozone concentrations in the Greater Athens Area (GAA) are examined through adjoint sensitivity analysis, using a meteorology and air quality forecasting system based on MM5, the in-house EMISLAB emissions processing system and the chemical transport model Community Multiscale Air Quality (CMAQ). Sensitivities of the ground level ozone concentrations ('response functional') at certain locations and target times are calculated with respect to the state variables (species concentrations on the grid points and species emissions) by running the adjoint model in reverse mode. The factors affecting ozone levels (most influential regions) are identified through the sensitivities spatial distribution for different times.

ACS Style

Spyros Andronopoulos; Athanasios Sfetsos; Diamando Vlachogiannis; Andreas Yiotis; Nikolaos Gounaris. Application of adjoint CMAQ chemical transport model in the Athens greater area: sensitivities study on ozone concentrations. International Journal of Environment and Pollution 2011, 47, 193 .

AMA Style

Spyros Andronopoulos, Athanasios Sfetsos, Diamando Vlachogiannis, Andreas Yiotis, Nikolaos Gounaris. Application of adjoint CMAQ chemical transport model in the Athens greater area: sensitivities study on ozone concentrations. International Journal of Environment and Pollution. 2011; 47 (1/2/3/4):193.

Chicago/Turabian Style

Spyros Andronopoulos; Athanasios Sfetsos; Diamando Vlachogiannis; Andreas Yiotis; Nikolaos Gounaris. 2011. "Application of adjoint CMAQ chemical transport model in the Athens greater area: sensitivities study on ozone concentrations." International Journal of Environment and Pollution 47, no. 1/2/3/4: 193.

Journal article
Published: 01 January 2010 in Journal of Software Engineering and Applications
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The present paper discusses the application of localized linear models for the prediction of hourly PM10 concentration values. The advantages of the proposed approach lies in the clustering of the data based on a common property and the utilization of the target variable during this process, which enables the development of more coherent models. Two alternative localized linear modelling approaches are developed and compared against benchmark models, one in which data are clustered based on their spatial proximity on the embedding space and one novel approach in which grouped data are described by the same linear model. Since the target variable is unknown during the prediction stage, a complimentary pattern recognition approach is developed to account for this lack of information. The application of the developed approach on several PM10 data sets from the Greater Athens Area, Helsinki and London monitoring networks returned a significant reduction of the prediction error under all examined metrics against conventional forecasting schemes such as the linear regression and the neural networks.

ACS Style

Athanasios Sfetsos; Diamando Vlachogiannis. Time Series Forecasting of Hourly PM10 Using Localized Linear Models. Journal of Software Engineering and Applications 2010, 03, 374 -383.

AMA Style

Athanasios Sfetsos, Diamando Vlachogiannis. Time Series Forecasting of Hourly PM10 Using Localized Linear Models. Journal of Software Engineering and Applications. 2010; 03 (04):374-383.

Chicago/Turabian Style

Athanasios Sfetsos; Diamando Vlachogiannis. 2010. "Time Series Forecasting of Hourly PM10 Using Localized Linear Models." Journal of Software Engineering and Applications 03, no. 04: 374-383.

Book chapter
Published: 30 April 2009 in Physics of Semiconductor Devices
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The present paper discusses the effectiveness of advanced modeling tools as a means of forecasting daily PM10 values, presenting as a case study the Greater Athens Area. The effectiveness of the described approaches is judged against mature forecasting approaches (e.g. linear regression and neural networks) in terms of absolute prediction error metrics and the confusion matrix, which shows the ability to correctly predict exceedances of the regulatory limit. Finally, a new approach is presented that incorporates the short-term dynamics of the PM10 time series into the forecasting model as explanatory variable.

ACS Style

Athanasios Sfetsos; Diamando Vlachogiannis. An investigation of the effectiveness of advanced modeling tools on the forecasting of daily PM10 values in the Greater Athens Area. Physics of Semiconductor Devices 2009, 305 -316.

AMA Style

Athanasios Sfetsos, Diamando Vlachogiannis. An investigation of the effectiveness of advanced modeling tools on the forecasting of daily PM10 values in the Greater Athens Area. Physics of Semiconductor Devices. 2009; ():305-316.

Chicago/Turabian Style

Athanasios Sfetsos; Diamando Vlachogiannis. 2009. "An investigation of the effectiveness of advanced modeling tools on the forecasting of daily PM10 values in the Greater Athens Area." Physics of Semiconductor Devices , no. : 305-316.

Book chapter
Published: 30 April 2009 in Physics of Semiconductor Devices
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Indoor air quality depends on the presence of both indoor and outdoor particle sources each of which produces different particles’ size distribution that may have mortality and morbidity effects. Positive Matrix Factorization (PMF) is a mathematical (statistical) procedure for identifying and quantifying the sources of air pollutants at a receptor location. A critical step in PMF is the number of factors determination and the present study aims at discussing this critical issue, by applying PMF on particles size distribution measurements data in a residential environment, in Athens, Greece. A main focal point of the present research is the investigation of the temporal behaviour of the particles size, as recorded in the time series, closely relating the averaging period of the utilised data with the number and type of factors in the PMF. The analysis is based on the estimation of the spectral properties of data and estimation of the integral time scale using the autocorrelation properties of the series. Furthermore, different factor analysis techniques have been applied, namely the rotated Principle Component Analysis (rPCA) and the Independent Component Analysis (ICA) and the results have been compared to PMF results.

ACS Style

Dikaia E. Saraga; Athanasis Sfetsos; Spyros Andronopoulos; Alexandros Chronis; Thomas Maggos; Diamando Vlachogiannis; John G. Bartzis. An investigation of the parameters influencing the determination of the number of particulate matter sources and their contribution to the air quality of an indoor residential environment. Physics of Semiconductor Devices 2009, 453 -464.

AMA Style

Dikaia E. Saraga, Athanasis Sfetsos, Spyros Andronopoulos, Alexandros Chronis, Thomas Maggos, Diamando Vlachogiannis, John G. Bartzis. An investigation of the parameters influencing the determination of the number of particulate matter sources and their contribution to the air quality of an indoor residential environment. Physics of Semiconductor Devices. 2009; ():453-464.

Chicago/Turabian Style

Dikaia E. Saraga; Athanasis Sfetsos; Spyros Andronopoulos; Alexandros Chronis; Thomas Maggos; Diamando Vlachogiannis; John G. Bartzis. 2009. "An investigation of the parameters influencing the determination of the number of particulate matter sources and their contribution to the air quality of an indoor residential environment." Physics of Semiconductor Devices , no. : 453-464.

Original articles
Published: 01 June 2005 in Environmental Sciences
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SF6 and PFC are being used as state-of-the-art tracers in tracer-technology programmes aimed at efficient oil recovery in the North Sea. This study aimed at specifying sources of leakage and quantifying emission levels of such gases and at evaluating their effect on global warming. To satisfy these goals, quantification of SF6 and PFC combustion by-products under different realistic flame/temperature conditions (turbine, refinery, power plant, households and car engine) has been performed. The PFC compounds studied were PMCP (CF3C5F9), PMCH (CF3C6F11) and 1, 2-PDMCH ((CF3)2C6F10). Three-dimensional transport atmospheric modelling has been carried out using UAM-AERO for four different tracers' emissions scenarios (Base scenario, one including maximum emissions of tracers and two scenarios including overestimated emissions during loading processes and distribution over the land of Norway). The results showed a significant increase in the background concentrations of SF6 and PFC in the last two mentioned scenarios up to 6 km height approximately. These concentration profiles have been used as input to radiative models. In addition to SF6 spectral data obtained from HITRAN2K complemented with new band measurements, newly obtained data with quantitative spectral analysis for the specific PFC have been used in the line-by-line (GENLN2) and broadband models.

ACS Style

Diamando Vlachogiannis; Athanasios Sfetsos; Athanassios K. Stubos; Rafaella-Eleni P. Sotiropoulou; Efthimios Tagaris; Christodoulos Pilinis; Wenyi Zhong; Joanna Haigh; Dag Oistein Eriksen; Sven K. Hartvig; Christos Chatzichristos; Jiri Muller; Reidun Kleven; Ingunn Nielssen. Assessment of the impact of SF6and PFC reservoir tracers on global warming, the AEOLOS study. Environmental Sciences 2005, 2, 263 -272.

AMA Style

Diamando Vlachogiannis, Athanasios Sfetsos, Athanassios K. Stubos, Rafaella-Eleni P. Sotiropoulou, Efthimios Tagaris, Christodoulos Pilinis, Wenyi Zhong, Joanna Haigh, Dag Oistein Eriksen, Sven K. Hartvig, Christos Chatzichristos, Jiri Muller, Reidun Kleven, Ingunn Nielssen. Assessment of the impact of SF6and PFC reservoir tracers on global warming, the AEOLOS study. Environmental Sciences. 2005; 2 (2-3):263-272.

Chicago/Turabian Style

Diamando Vlachogiannis; Athanasios Sfetsos; Athanassios K. Stubos; Rafaella-Eleni P. Sotiropoulou; Efthimios Tagaris; Christodoulos Pilinis; Wenyi Zhong; Joanna Haigh; Dag Oistein Eriksen; Sven K. Hartvig; Christos Chatzichristos; Jiri Muller; Reidun Kleven; Ingunn Nielssen. 2005. "Assessment of the impact of SF6and PFC reservoir tracers on global warming, the AEOLOS study." Environmental Sciences 2, no. 2-3: 263-272.

Comparative study
Published: 01 March 2003 in Science of The Total Environment
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A set of methods has been compiled to compare gridded air emission inventories that have been derived, on the same spatial grid, using widely differing techniques. Top-down and bottom-up inventories for Milan, Italy and for the Greater Athens area (GAA), Greece were used to test and apply these methods. The applicability of each method to certain source sectors was assessed by conducting sensitivity analyses. Whilst some of the methods (such as regression calculations or the Moran coefficient) appeared very sensitive to variations of point source emissions, others (e.g. the construction of difference maps) proved more appropriate for characterizing line source differences. Area sources could best be dealt with by using the newly developed acceptability criterion. The development of these tools allows a reproducible comparison of sets of emission inventories and consequently supports developments towards improvement.

ACS Style

Wilfried Winiwarter; Chris Dore; Garry Hayman; Diamando Vlachogiannis; Nikolaos Gounaris; John Bartzis; Sam Ekstrand; Matteo Tamponi; Giuseppe Maffeis. Methods for comparing gridded inventories of atmospheric emissions—application for Milan province, Italy and the Greater Athens Area, Greece. Science of The Total Environment 2003, 303, 231 -243.

AMA Style

Wilfried Winiwarter, Chris Dore, Garry Hayman, Diamando Vlachogiannis, Nikolaos Gounaris, John Bartzis, Sam Ekstrand, Matteo Tamponi, Giuseppe Maffeis. Methods for comparing gridded inventories of atmospheric emissions—application for Milan province, Italy and the Greater Athens Area, Greece. Science of The Total Environment. 2003; 303 (3):231-243.

Chicago/Turabian Style

Wilfried Winiwarter; Chris Dore; Garry Hayman; Diamando Vlachogiannis; Nikolaos Gounaris; John Bartzis; Sam Ekstrand; Matteo Tamponi; Giuseppe Maffeis. 2003. "Methods for comparing gridded inventories of atmospheric emissions—application for Milan province, Italy and the Greater Athens Area, Greece." Science of The Total Environment 303, no. 3: 231-243.

Book chapter
Published: 01 January 2000 in Urban Air Quality: Measurement, Modelling and Management
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This study concentrated on the effects of Biogenic Volatile Organic Compounds (BVOC) emissions on ozone (03) in an area of the Eastern Spain on June 12, 1997, a day characterised by sea breeze. Simulation of meteorology was performed with the three-dimensional model ADREA-I. Comparisons of the model results with observations have revealed overall a good agreement in temperature and wind velocity. Two runs were performed with UAM-IV for the photochemical calculations. The first simulated the effects of the anthropogenic emissions only (run A) and the second the combined effects of anthropogenic and biogenic emissions, (run B). Comparisons of the model 03 concentrations with measurements showed a general agreement with the experimental data. Discrepancies between the calculated results and the observations during the early morning hours could be attributed to inaccuracies in nitrogen oxides (NOx) from the anthropogenic emissions inventory. Comparisons between runs A and B yielded differences up to 30% in the morning, over inland areas. It was deduced that the inclusion of BVOC in total emissions could result in an increase or decrease of tropospheric O3, depending on the available amounts of anthropogenic emissions.

ACS Style

Diamando Vlachogiannis; Spyros Andronopoulos; Artemis Passamichali; Nikos Gounaris; John G. Bartzis. A Three-Dimensional Model Study of the Impact of AVOC and BVOC Emissions on Ozone in an Urban Area of the Eastern Spain. Urban Air Quality: Measurement, Modelling and Management 2000, 41 -48.

AMA Style

Diamando Vlachogiannis, Spyros Andronopoulos, Artemis Passamichali, Nikos Gounaris, John G. Bartzis. A Three-Dimensional Model Study of the Impact of AVOC and BVOC Emissions on Ozone in an Urban Area of the Eastern Spain. Urban Air Quality: Measurement, Modelling and Management. 2000; ():41-48.

Chicago/Turabian Style

Diamando Vlachogiannis; Spyros Andronopoulos; Artemis Passamichali; Nikos Gounaris; John G. Bartzis. 2000. "A Three-Dimensional Model Study of the Impact of AVOC and BVOC Emissions on Ozone in an Urban Area of the Eastern Spain." Urban Air Quality: Measurement, Modelling and Management , no. : 41-48.