违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 东亚冬季风异常对区域气溶胶分布的影响-Impact of anomalous East Asian winter monsoon on the spatial distribution of aerosols over East Asia
doi:  10.3878/j.issn.1006-9585.2017.16182
东亚冬季风异常对区域气溶胶分布的影响

Impact of anomalous East Asian winter monsoon on the spatial distribution of aerosols over East Asia
摘要点击 840  全文点击 162  投稿时间:2016-09-28  修订日期:2016-12-05
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基金:  国家自然科学基金
中文关键词:  东亚冬季风  季风指数  气溶胶  AOD
英文关键词:  East Asia winter monsoon  East Asia winter monsoon index  Aerosol  Aerosol optical depth
              
作者中文名作者英文名单位
谢旻XIE Min南京大学大气科学学院
王体健WANG Tijian南京大学大气科学学院
李树LI Shu南京大学大气科学学院
庄炳亮ZHUANG Bingliang南京大学大气科学学院
刘芷君LIU Zhijun南京大学大气科学学院
引用:谢旻,王体健,李树,庄炳亮,刘芷君.2017.东亚冬季风异常对区域气溶胶分布的影响[J].气候与环境研究
Citation:XIE Min,WANG Tijian,LI Shu,ZHUANG Bingliang,LIU Zhijun.2017.Impact of anomalous East Asian winter monsoon on the spatial distribution of aerosols over East Asia[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      气溶胶已是东亚地区最主要的大气污染物之一,其时空分布会受到东亚季风气候的影响。利用2000-2014年MODIS/AOD和NCEP月平均气象场再分析资料,本研究分析了东亚冬季风长期变化趋势、气溶胶年际变化规律,探讨了东亚冬季风强度变化对气溶胶分布的影响。基于MODIS/AOD,发现近十年东亚地区冬季AOD呈现上升趋势,最大值为2007年的0.44,高值区覆盖四川盆地、华北平原及长江中下游大部分地区。风场特征类冬季风指数分析表明,东亚冬季风存在明显的年际和年代际差异,近年出现逐渐减弱的趋势。强冬季风年,海陆气压差增大、东亚大槽加深增强,东亚地区偏北风异常,风场的增强将引导更多冷空气南下,从而给东亚大部分地区带来明显的降温天气;弱年相反。气象场差异引起气溶胶分布变化,强年较强的偏北风将气溶胶向南方输送,东亚地区AOD出现“北低南高”的空间分布;弱年偏北风较弱,导致气溶胶集中在华北平原一带,AOD出现“北高南低”的空间分布。
Abstract:
      Aerosol is one of the most crucial air pollutants in East Asia. Its temporal and spatial distribution can be affected by East Asia winter monsoon. By using MODIS aerosol product and NCEP reanalysis monthly meteorological field data between 2000 and 2014, this study statistically analyzes the variation trend of East Asia winter monsoon (EAWM), the annual variation of aerosol optical depth (AOD) over East Asia, and the impact of anomalous EAWM on the distribution of aerosols. The analysis based on the aerosol product shows that the values of AOD continually increase during the recent decade in the winter of East Asia, with the maximum of 0.44 in 2007. High values usually occur in the Sichuan Basin, the North China Plain, and most areas of the middle and lower reaches of the Yangtze. With the aid of EAWM index defined by the characteristics of wind field, it is found that EAWM has strong inter-annual and inter-decadal variations and exhibits a gradually decreasing trend. The results also show that EAWM has an important effect on the spatial distribution of aerosols. In strong EAWM years, the stronger north wind can enhance the transportation of aerosols to the southern area, and form the spatial distribution pattern of north low and south high for AOD over East Asia. But in weak EAWM years, the transportation effect is so weaken that more aerosols are accumulated in the North China Plain, and form the AOD pattern of north high and south low.
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