東亞夏季風(fēng)環(huán)流對(duì)氣溶膠分布的影響

doi:10.3969/2014jms.0003

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東亞夏季風(fēng)環(huán)流對(duì)氣溶膠分布的影響
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                        10.3969/2014jms.0003
                    
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基金項(xiàng)目:國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)項(xiàng)目(2011CB403400)

Impacts of East Asian summer monsoon circulation on aerosol distribution

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用2001—2012年逐月的MODIS-TERRA衛(wèi)星觀測(cè)氣溶膠光學(xué)厚度(AOD)資料和NCEP/NCAR風(fēng)場(chǎng)資料,分析了5—8月東亞地區(qū)AOD的時(shí)-空分布特征,研究東亞夏季風(fēng)環(huán)流對(duì)氣溶膠時(shí)-空分布的影響。主要結(jié)論如下:5—8月的中國(guó)東部及鄰近海洋上AOD有著顯著的季節(jié)演變特征,尤其是32.5 °N附近的AOD高值區(qū),其強(qiáng)度和范圍在5—8月逐漸增強(qiáng)然后又減弱。東亞夏季風(fēng)通過(guò)環(huán)流輸送作用對(duì)各地的AOD產(chǎn)生了不同程度的影響,使中國(guó)南部AOD減少,而華北和東北地區(qū)AOD增加。在強(qiáng)、弱季風(fēng)年背景下,7月觀測(cè)的AOD差異與環(huán)流輸送作用差異的分布特征有著一定的相似性,體現(xiàn)出東亞夏季風(fēng)年際變化對(duì)氣溶膠分布的影響。在東亞夏季風(fēng)演變的不同階段,季風(fēng)環(huán)流對(duì)氣溶膠輸送大部分情況下,可解釋局地氣溶膠變化10%~20%的方差。

Abstract:

By using the monthly MODIS-TERRA aerosol optical depth(AOD) product data at 550nm wave length during 2001-2012 and NCEP/NCAR reanalysis data, the temporal and spatial distribution of AOD in East Asia during May to August was analyzed and the impacts of East Asian summer monsoon (EASM) circulation on aerosol distributions were discussed. Four main conclusions are evident: firstly, AOD has significant seasonal variations characteristics from May to August in East China and its adjacent seas, especially in areas near 32.5 °N with high aerosol concentrations. The magnitude and scope of AOD gradually increase and spread, and then decrease and retreat from May to August; secondly, the EASM has a measurable influence on AOD distribution at various degrees through its circulation transportation, which makes AOD decrease in South China but increase in North and Northeast China; thirdly, under the background of extreme strong and weak EASM year, the spatial distributions of the differences of measured AOD is similar to the role of monsoon circulation transportation in July, which reflects the influence of monsoon circulation interannual variability of the EASM on aerosol distribution; finally, the aerosol transportation due to monsoon circulation accounts for the 10%-20% variance of local aerosol changes during the evolution of EASM.

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安禮政,江靜,周洋.東亞夏季風(fēng)環(huán)流對(duì)氣溶膠分布的影響.氣象科學(xué),2015,35(1):26-32 AN Lizheng, JIANG Jing, ZHOU Yang. Impacts of East Asian summer monsoon circulation on aerosol distribution. Journal of the Meteorological Sciences,2015,35(1):26-32

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收稿日期:2013-04-28
最后修改日期:2013-12-30
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在線發(fā)布日期: 2015-03-13
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