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contributor authorYang, Yan
contributor authorFan, Jiwen
contributor authorLeung, L. Ruby
contributor authorZhao, Chun
contributor authorLi, Zhanqing
contributor authorRosenfeld, Daniel
date accessioned2017-06-09T16:59:03Z
date available2017-06-09T16:59:03Z
date copyright2016/03/01
date issued2016
identifier issn0022-4928
identifier otherams-77439.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219997
description abstractsignificant reduction in precipitation in the past decades has been documented over many mountain ranges such as those in central and eastern China. Consistent with the increase of air pollution in these regions, it has been argued that the precipitation trend is linked to the aerosol microphysical effect on suppressing warm rain. Rigorous quantitative investigations on the reasons responsible for the precipitation reduction are lacking. In this study, an improved Weather Research and Forecasting (WRF) Model with online coupled chemistry (WRF-Chem) is applied and simulations are conducted at the convection-permitting scale to explore the major mechanisms governing changes in precipitation from orographic clouds in the Mt. Hua area in central China. It is found that anthropogenic pollution contributes to a ~40% reduction of precipitation over Mt. Hua during the 1-month summertime period. The reduction is mainly associated with precipitation events associated with valley?mountain circulation and a mesoscale cold-front event. In this paper (Part I), the mechanism leading to a significant reduction for the cases associated with valley?mountain circulation is scrutinized. It is found that the valley breeze is weakened by aerosols as a result of absorbing aerosol-induced warming aloft and cooling near the surface as a result of aerosol?radiation interaction (ARI). The weakened valley breeze and the reduced water vapor in the valley due to reduced evapotranspiration as a result of surface cooling significantly reduce the transport of water vapor from the valley to mountain and the relative humidity over the mountain, thus suppressing convection and precipitation in the mountain.
publisherAmerican Meteorological Society
titleMechanisms Contributing to Suppressed Precipitation in Mt. Hua of Central China. Part I: Mountain Valley Circulation
typeJournal Paper
journal volume73
journal issue3
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/JAS-D-15-0233.1
journal fristpage1351
journal lastpage1366
treeJournal of the Atmospheric Sciences:;2016:;Volume( 073 ):;issue: 003
contenttypeFulltext


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