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报告编号	N170003368
	Amplification of ENSO Effects on Indian Summer Monsoon by Absorbing Aerosols.
	Kim, M; Lau, W. K. M; Kim, K; Sang, J; Kim, Y; Lee, W.
英文摘要	In this study, we present observational evidence, based on satellite aerosol measurements and MERRA reanalysis data for the period 1979-2011, indicating that absorbing aerosols can have strong influence on seasonal-to-interannual variability of the Indian summer monsoon rainfall, including amplification of ENSO effects. We find a significant correlation between ENSO (El Nino Southern Oscillation) and aerosol loading in April-May, with La Nina (El Nino) conditions favoring increased (decreased) aerosol accumulation over northern India, with maximum aerosol optical depth (AOD) over the Arabian Sea and Northwestern India, indicative of strong concentration of dust aerosols transported from West Asia and Middle East deserts. Composite analyses based on a normalized aerosol index (NAI) show that high concentration of aerosol over northern India in April-May is associated with increased moisture transport, enhanced dynamically induced warming of the upper troposphere over the Tibetan Plateau, and enhanced rainfall over northern India and the Himalayan foothills during May-June, followed by a subsequent suppressed monsoon rainfall over all India,consistent with the Elevated Heat Pump (EHP) hypothesis (Lau et al. 2006). Further analyses from sub-sampling of ENSO years, with normal (less than 1 sigma), and abnormal (greater than 1 sigma)) NAI over northern India respectively show that the EHP may lead to an amplification of the Indian summer monsoon response to ENSO forcing, particularly with respect to the increased rainfall over the Himalayan foothills, and the warming of the upper troposphere over the Tibetan Plateau. Our results suggest that absorbing aerosol, particular desert dusts can strongly modulate ENSO influence, and possibly play important roles as a feedback agent in climate change in Asian monsoon regions.
英文关键词	Amplification El nino Southern oscillation India Summer Monsoons Absorptivity Aerosols Rain Atmospheric heating Optical thickness Data reduction Satellite observation Radiative forcing Carbon Deserts Dust Troposphere Ar
出版年	2015
语种	英语
国家	United States
来源学科分类	68 - Environmental Pollution & Control ; 55C - Meteorological Data Collection, Analysis, & Weather Forecasting
URL	http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=5a02c4c931c97d1c38a88b70
来源机构	National Aeronautics and Space Administration
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/273989
推荐引用方式 GB/T 7714	Kim, M,Lau, W. K. M,Kim, K,et al. Amplification of ENSO Effects on Indian Summer Monsoon by Absorbing Aerosols.,2015.