Temporal disparity of the atmospheric systems contributing to interannual variation of wintertime haze pollution in the North China Plain
Temporal disparity of the atmospheric systems contributing to interannual variation of wintertime haze pollution in the North China Plain
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华北平原冬季霾污染年际变化的大气系统时间差异
DOI：
10.1002/joc.6198
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发表时间：
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期刊：
影响因子：
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通讯作者：
Wang Y
中科院分区：
文献类型：
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作者：
Chen S;Guo J;Song LY;Cohen J;Wang Y
前期研究表明，华东经向（北风或南风）风异常主要通过改变地面风速和湿度，对华北平原冬季霾污染的年际变化起着重要的调节作用。在此，我们报道了与冬季霾污染年际变化相关的华东经向风异常形成因素在20世纪90年代中期经历了显着的年代际变化。 20世纪90年代中期之前，两个上游大气波列通过诱发东北亚地区显着的位势高度异常，导致华东地区经向风异常的产生。第一个发生在欧亚大陆中纬度地区，并向东传播到东亚，类似于东大西洋-西俄罗斯（EAWR）模式。第二股沿着副热带亚洲急流向东传播。此外，这一时期东亚槽（EAT）强度的变化与华北冬季霾变化的年际变化密切相关。相比之下，20世纪90年代中期以后，没有观测到沿着亚洲副热带急流的大气波列。此外，EAT强度与冬季NCP霾变化之间的联系较弱。中纬度EAWR类模式和厄尔尼诺南方涛动相关的热带太平洋海表温度异常是解释中国东部经向风异常的可能因素。了解导致雾霾年际变化的大气异常变化对于预测华北地区雾霾至关重要。
Previous studies indicated that the meridional (northerly or southerly) wind anomalies over East China play an important role in modulating interannual variation of the winter haze pollution in the North China Plain (NCP) mainly via changing surface wind speed and humidity. Here, we report that the factors for the formation of the meridional wind anomalies over East China related to interannual variation of winter haze pollution experienced a significant interdecadal change around the mid‐1990s. Before the mid‐1990s, two upstream atmospheric wave trains contribute to generation of the meridional wind anomalies over East China via inducing significant geopotential height anomalies over northeast Asia. The first occurred over mid‐latitude Eurasia and propagated eastward into East Asia, resembling the East Atlantic‐west Russia (EAWR) pattern. The second propagated eastward along the subtropical Asian jet. Furthermore, during this period, the change in the intensity of East Asian trough (EAT) was closely linked with interannual variation of the winter haze variation in the NCP. By contrast, after the mid‐1990s, the atmospheric wave train along the Asian subtropical jet was not observed. Furthermore, the connection between the EAT intensity and the winter time NCP haze variation was weak. The mid‐latitude EAWR‐like pattern and the El Niño‐Southern Oscillation‐related sea surface temperature anomalies in the tropical Pacific were possible factors that explain the meridional wind anomalies over East China. Understanding the change in the atmospheric anomalies contributing to interannual variation of the haze is essential for the prediction of haze in the NCP.