Aerosol radiative forcing over the Indo-Gangetic plains during major dust storms

被引:157
作者
Prasad, Anup K.
Singh, Sachchidanand
Chauhan, S. S.
Srivastava, Manoi K.
Singh, Ramesh P. [1 ]
Singh, Risal
机构
[1] Coll Sci, Ctr Earth & Observing & Space Res, Fairfax, VA USA
[2] Indian Inst Technol, Dept Civil Engn, Kanpur 208016, Uttar Pradesh, India
[3] Natl Phys Lab, Radio & Atmospher Sci Div, New Delhi 110012, India
关键词
aerosols; dust storms; radiative forcing; summer season; indo-gangetic plains;
D O I
10.1016/j.atmosenv.2007.03.060
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Indo-Gangetic (IG) alluvial plains, one of the largest river basins in the world, suffers from the long range transport of mineral dust from the western and and desert regions of Africa, Arabia and Rajasthan during the summer (pre-monsoon season, April-June). These dust storms influence the aerosol optical depth (AOD) across the IG plains. The Kanpur AERONET (Aerosol Robotic Network) station and Moderate Resolution Imaging Spectro-radiometer (MODIS) data show pronounced effect on the aerosol optical properties and aerosol size distribution during major dust storm events over the IG plains that have significant effect on the aerosol radiative forcing (ARF). The multi-band AOD, from AERONET and MODIS, show contrasting changes in wavelength dependency over dust affected regions. A time collocated (+/- 30 min) validation of AERONET AOD with MODIS Terra (level 2 swath product) over Kanpur, at a common wavelength of 550, nm for the period 2001-2005 show moderate correlation (R-2 similar to 0.6) during the summer season. The average surface forcing is found to change by -23 W m(-2) during dust events and the top of the atmosphere (TOA) forcing change by -11 W m(-2) as compared to the non-dusty clear-sky days. A strong correlation is found between AOD at 500 nm and the ARF. At surface, the correlation coefficient between AOD and ARF is found to be high (R-2 = 0.925) and is found to be moderate (R = 0.628) at the TOA. The slope of the regression line gives the aerosol forcing efficiency at 500 nm of about -46 +/- 2.6 W m(-2) and -17 +/- 2.5W m(-2) at the surface and the TOA, respectively. The ARF is found to increase with the advance of the dry season in conjunction with the gradual rise in AOD (at 500 nm) from April (0.4-0.5) to June (0.6-0.7) over the IG plains. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6289 / 6301
页数:13
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