Intercomparison of Aerosol Optical Thickness Derived from MODIS and in Situ Ground Datasets over Jaipur, a Semi-arid Zone in India

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• 作者：Swagata Payra ; Manish Soni ; Anikender Kumar ; Divya Prakash ; Sunita Verma
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：August 4, 2015
• 年：2015
• 卷：49
• 期：15
• 页码：9237-9246
• 全文大小：693K
• ISSN：1520-5851

文摘

The first detailed seasonal validation has been carried out for the Moderate Resolution Imaging Spectroradiometer (MODIS) Terra and Aqua satellites Level 2.0 Collection Version 5.1 AOT (蟿_MODIS) with Aerosol Robotic Network (AERONET) Level 2.0 AOT (蟿_AERONET) for the years 2009鈥?012 over semi-arid region Jaipur, northwestern India. The correlation between 蟿_MODIS versus 蟿_AERONET at 550 nm is determined with different spatial and temporal size windows. The 蟿_MODIS overestimates 蟿_AERONET within a range of +0.06 卤 0.24 during the pre-monsoon (April鈥揓une) season, while it underestimates the 蟿_AERONET with 鈭?.04 卤 0.12 and 鈭?.05 卤 0.18 during dry (December鈥揗arch) and post-monsoon (October鈥揘ovember) seasons, respectively. Correlation without (with) error envelope has been found for pre-monsoon at 0.71 (0.89), post-monsoon at 0.76 (0.94), and dry season at 0.78 (0.95). 蟿_MODIS is compared to 蟿_AERONET at three more ground AERONET stations in India, i.e., Kanpur, Gual Pahari, and Pune. Furthermore, the performance of MODIS Deep Blue and Aqua AOT_550聽nm (蟿_DB550聽nm and 蟿_Aqua550聽nm) with 蟿_AERONET is also evaluated for all considered sites over India along with a U.S. desert site at White Sand, Tularosa Basin, NM. The statistical results reveal that 蟿_Aqua550聽nm performs better over Kanpur and Pune, whereas 蟿_DB550聽nm performs better over Jaipur, Gual Pahari, and White Sand High Energy Laser Systems Test Facility (HELSTF) (U.S. site).