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İstanbul Teknik Üniversitesi (2014)

Investigation Of Impacts Of Aerosols On Eastern Mediterranean Region Climate

AĞAÇAYAK Tuğba

Titre : Investigation Of Impacts Of Aerosols On Eastern Mediterranean Region Climate

Aerosollerin Doğu Akdeniz Bölgesi İklimi Üzerine Etkisinin Araştırılması

Auteur : AĞAÇAYAK Tuğba

Université de soutenance : İstanbul Teknik Üniversitesi

Grade : Doctor of Philosophy (PhD) 2014

Résumé partiel
Eastern Mediterranean is a region which has increasing population growth with low Environmental Performance Indicator. Air pollution is one of the problems, which decreases the environmental quality. It is known that long-range transport of Saharan dust is one of the main contributors to the air pollution problem. The purpose of the first section of this study is to investigate the relationship between high particulate matter concentrations and mineral dust transport using regional climate modelling, satellite data as well as in-situ observations and to determine the aerosol optical properties and radiative effects of aerosols for a dust transport episode. PM10 values for the selected regions for the episode in Turkey and at 10 different stations in Istanbul for the period 2004-2010 were provided by the Turkish Ministry of Environment. Daily mean PM10 concentrations exceeding the European standard of 50 µg/m3 were found to be on average, 49 days for the Spring period, 45 days for the Winter period, and 41 days for the Fall period for Istanbul. DREAM model output suggests that high PM10 concentrations correlate highly with mineral dust transport episodes from Saharan desert (i.e., 23% for winter and 58% for spring). During the period between March 21st and 24th, 2008, observed daily mean of PM10 concentrations reach up to 180 µg/m3 in Marmara Region. Model results highly correlated with PM10 concentrations and satellite image. It is found that RegCM4.1 is able to model March 2008 episode and it can capture the dust pattern correctly in comparison with the satellite image. On March 23th 2008, when the dust episode affecting Aegean and Marmara Regions intensively, daily mean PM10 was 102.6 µg/m3 in Aegean Region and 117.3 µg/m3 in Marmara Region according to the data provided by Turkish Ministry of Environment and Urbanization. Model performance was checked through the AOD model outputs and AERONET observations.

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