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Impacts of Atmospheric Circulations on Aerosol Distributions in Autumn Over Eastern China: Observational Evidences : Volume 15, Issue 3 (05/02/2015)

By Zheng, X.-y.

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Book Id: WPLBN0003997095
Format Type: PDF Article :
File Size: Pages 41
Reproduction Date: 2015

Title: Impacts of Atmospheric Circulations on Aerosol Distributions in Autumn Over Eastern China: Observational Evidences : Volume 15, Issue 3 (05/02/2015)  
Author: Zheng, X.-y.
Volume: Vol. 15, Issue 3
Language: English
Subject: Science, Atmospheric, Chemistry
Collection: Periodicals: Journal and Magazine Collection
Subcollection: Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description: School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China. Regional heavy pollution events in East China (110–122° E, 28–40° N) are the main environmental problems recently because of the high urbanization and rapid economic development connected with too much emissions of pollutants. However, appropriate weather condition is another factor which cannot be ignored for these events. In this study, the relationship between regional pollution status and larger scale atmospheric circulations over East China in October is investigated using ten-year (2001–2010) MODIS/Terra aerosol optical depth (AOD) product and the NCEP reanalysis data together with case analysis and composite analysis. Generally, statistics in East China show values of mean AOD vary from 0.3 to 0.9 in October over the region, and larger AOD variances are accompanied with the distribution of higher average AOD. Eighteen pollution episodes (regional mean AOD > 0.6) and ten clean episodes (regional mean AOD < 0.4) are selected and then categorized into six polluted types and three clean types, respectively. Each type represents different weather pattern associated with the combination of lower and upper atmospheric circulation. Generally, the uniform surface pressure field in East China or steady straight westerly in middle troposphere, particularly the rear of anticyclone at 850 hPa, are typical weather patterns responsible for heavy pollution events, while clean episodes occur when strong southeastward cold air advection prevails below the middle troposphere or air masses are transported from sea to the mainland. The above studies are especially useful to the government decision make on balance of economic activities and pollution mitigations.

Impacts of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidences

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