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Aerosol optical depth over the Tibetan Plateau



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Click Here GEOPHYSICAL RESEARCH LETTERS VOL 35 L16804 doi 10 1029 2008GL034981 2008 for Full Article Aerosol optical depth over the Tibetan Plateau and its relation to aerosols over the Taklimakan Desert Xiangao Xia 1 Pucai Wang 1 Yuesi Wang 1 Zhanqing Li 2 Jinyuan Xin 1 Jing Liu 1 3 and Hongbin Chen1 Received 11 June 2008 revised 10 July 2008 accepted 21 July 2008 published 19 August 2008 1 The Multiangle Imaging SpectroRadiometer MISR aerosol optical depths AODs over the Tibetan Plateau TP are compared with ground based remote sensing data The result shows that 27 out of 32 MISR AODs fall within the expected uncertainty i e 0 05 or 20 AOD The mean bias and the root mean square error between ground and satellite AODs are 0 01 and 0 03 respectively The 7 year MISR AOD data are used to study seasonal and inter annual variations of AOD over the TP The results show distinct seasonal variation with seasonal AOD being 0 27 0 25 0 13 and 0 11 from spring to winter AOD over the TP is closely related to that over the Taklimakan desert in summer however poor correlation is observed in spring Higher AOD in spring and summer over the TP merits further study including its causes and implications for climate and environment Citation Xia X P Wang Y Wang Z Li J Xin J Liu and H Chen 2008 Aerosol optical depth over the Tibetan Plateau and its relation to aerosols over the Taklimakan Desert Geophys Res Lett 35 L16804 doi 10 1029 2008GL034981 1 Introduction 2 The Tibetan Plateau TP is a vast and elevated plateau in East Asia that extends over the area of 27 45 N 70 105 E and its mean elevation is higher than 4000 m above sea level The influence of the TP upon atmospheric circulation and climate through its mechanical as well as thermal forcing is early recognized Yeh et al 1957 Wu et al 2007 The elevated heating of the TP to the atmosphere plays a fundamental role in the formation and maintenance of the Asian monsoon system Wu et al 2007 Much attention has been paid to atmospheric chemistry over the TP since discoveries of Tibetan ozone valley Zhou and Luo 1994 Zou 1996 and an ozone mini hole over the TP Bian et al 2006 Active upwelling motion over the TP is an important factor contributing to the ozone minimum Large adiabatic expansion of air mass along with the upwelling motion is also favorable for particle formation Tobo et al 2007 The heterogeneous chemistry on aerosol surfaces is an important mechanism influencing ozone more importantly aerosol has widely been recognized as 1 Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China 2 Department of Atmospheric and Oceanic Science and Earth System Science Interdisciplinary Center University of Maryland College Park Maryland USA 3 College of Environment Science and Engineering Nanjing University of Information Science and Technology Nanjing China an important



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