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Impacts of Aerosol Direct Effects on the South Asian Climate: Assessment of Radiative Feedback Processes Using Model Simulations and Satellite/Surface MeasurementsCurrent assessment of aerosol radiative effect is hindered by our incomplete knowledge of aerosol optical properties, especially absorption, and our current inability to quantify physical and microphysical processes. In this research, we investigate direct aerosol radiative effect over heavy aerosol loading areas (e.g., Indo-Gangetic Plains, South/East Asia) and its feedbacks on the South Asian climate during the pre-monsoon season (March-June) using the Purdue Regional Climate Model (PRCM) with prescribed aerosol data derived by the NASA Goddard Earth Observing System Model (GEOS-5). Our modeling domain covers South and East Asia (60-140E and 0-50N) with spatial resolutions of 45 km in horizontal and 28 layers in vertical. The model is integrated from 15 February to 30 June 2008 continuously without nudging (i.e., only forced by initial/boundary conditions). Two numerical experiments are conducted with and without the aerosol-radiation effects. Both simulations are successful in reproducing the synoptic patterns on seasonal-to-interannual time scales and capturing a pre-monsoon feature of the northward rainfall propagation over Indian region in early June which shown in Tropical Rainfall Measuring Mission (TRMM) observation. Preliminary result suggests aerosol-radiation interactions mainly alter surface-atmosphere energetics and further result in an adjustment of the vertical temperature distribution in lower atmosphere (below 700 hPa). The modifications of temperature and associated rainfall and circulation feedbacks on the regional climate will be discussed in the presentation.
Document ID
20120009173
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Wang, Sheng-Hsiang (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gautam, Ritesh (Universities Space Research Association Greenbelt, MD, United States)
Lau, William K. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tsay, Si-Chee (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sun, Wen-Yih (Purdue Univ. West Lafayette, IN, United States)
Kim, Kyu-Myong (Universities Space Research Association Greenbelt, MD, United States)
Chern, Jiun-Dar (Universities Space Research Association Greenbelt, MD, United States)
Hsu, Christina (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lin, Neng-Huei (National Central Univ. Chung-Li, Taiwan, Province of China)
Date Acquired
August 25, 2013
Publication Date
December 5, 2011
Subject Category
Meteorology And Climatology
Report/Patent Number
GSFC.ABS.6078.2012
Meeting Information
Meeting: 2011 Fall AGU Meeting
Location: San Francisco, CA
Country: United States
Start Date: August 5, 2011
End Date: August 9, 2011
Sponsors: American Geophysical Union
Distribution Limits
Public
Copyright
Public Use Permitted.

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