globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-016-3430-y
Scopus记录号: 2-s2.0-84994200830
论文题名:
Impacts of aerosol–monsoon interaction on rainfall and circulation over Northern India and the Himalaya Foothills
作者: Lau W.K.M.; Kim K.-M.; Shi J.-J.; Matsui T.; Chin M.; Tan Q.; Peters-Lidard C.; Tao W.K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期:2017-05-06
起始页码: 1945
结束页码: 1960
语种: 英语
英文摘要: The boreal summer of 2008 was unusual for the Indian monsoon, featuring exceptional heavy loading of dust aerosols over the Arabian Sea and northern-central India, near normal all-India rainfall, but excessive heavy rain, causing disastrous flooding in the Northern Indian Himalaya Foothills (NIHF) regions, accompanied by persistent drought conditions in central and southern India. Using the NASA Unified-physics Weather Research Forecast (NUWRF) model with fully interactive aerosol physics and dynamics, we carried out three sets of 7-day ensemble model forecast experiments: (1) control with no aerosol, (2) aerosol radiative effect only and (3) aerosol radiative and aerosol-cloud-microphysics effects, to study the impacts of aerosol-monsoon interactions on monsoon variability over the NIHF during the summer of 2008. Results show that aerosol-radiation interaction (ARI), i.e., dust aerosol transport, and dynamical feedback processes induced by aerosol-radiative heating, plays a key role in altering the large-scale monsoon circulation system, reflected by an increased north-south tropospheric temperature gradient, a northward shift of heavy monsoon rainfall, advancing the monsoon onset by 1–5 days over the HF, consistent with the EHP hypothesis (Lau et al. in Clim Dyn 26(7–8):855–864, 2006). Additionally, we found that dust aerosols, via the semi-direct effect, increase atmospheric stability, and cause the dissipation of a developing monsoon onset cyclone over northeastern India/northern Bay of Bengal. Eventually, in a matter of several days, ARI transforms the developing monsoon cyclone into meso-scale convective cells along the HF slopes. Aerosol-Cloud-microphysics Interaction (ACI) further enhances the ARI effect in invigorating the deep convection cells and speeding up the transformation processes. Results indicate that even in short-term (up to weekly) numerical forecasting of monsoon circulation and rainfall, effects of aerosol-monsoon interaction can be substantial and cannot be ignored. © 2016, The Author(s).
资助项目: DOE, U.S. Department of Energy ; NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53091
Appears in Collections:过去全球变化的重建

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作者单位: Earth System Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, MD, United States; Department of Atmospheric Sciences, University of Texas, College Station, TX, United States; Climate and Radiation Laboratory, Earth Science Division, Goddard Space Flight Center, Greenbelt, MD, United States; Goddard Earth Science Technology, Application Research (GESTAR), Morgan State University, Baltimore, MD, United States; Atmospheric Chemistry and Dynamics Laboratory, Earth Science Division, Goddard Space Flight Center, Greenbelt, MD, United States; Earth Science Division, Goddard Space Flight Center, Greenbelt, MD, United States; Mesoscale Atmospheric Processes Laboratory, Earth Science Division, Goddard Space Flight Center, Greenbelt, MD, United States

Recommended Citation:
Lau W.K.M.,Kim K.-M.,Shi J.-J.,et al. Impacts of aerosol–monsoon interaction on rainfall and circulation over Northern India and the Himalaya Foothills[J]. Climate Dynamics,2017-01-01,49(2017-05-06)
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