1981—2018年中国东北地区秋冬季霾日变化及其与北极海冰的关系

doi:10.3969/j.issn.1673-503X.2022.04.008

Abstract

Abstract:

Using observational data at 166 meteorological stations in Northeast China from 1981 to 2018, we defined a haze-day index in autumn and winter in Northeast China and analyzed the internal relationship between the number of haze days and the atmospheric circulation anomalies. The results indicated that the haze-day index in autumn and winter in Northeast China exhibits a significant interannual variation.The configuration of atmospheric circulation anomalies such as the negative phase of the Eurasia-Pacific Teleconnection Pattern (EUP) and the weak East Asian trough leads to the increase in the occurrence frequency of haze events during autumn and winter in Northeast China. The Barents Sea and the northern Kara Sea are key areas of sea ice that affect the interannual variation of haze days in autumn and winter over Northeast China. The area of sea ice in this region has a significantly negative correlation with the number of haze days. The atmospheric circulation indirectly affects the occurrence frequency of haze events in autumn and winter in Northeast China. When the area of Arctic sea ice is anomalously low, East Asian winter monsoon is relatively weak, near-surface wind speed is low, and ambient humidity is high. Meanwhile, Northeast China is controlled by the abnormal southerly winds on the western side of the Northeast Asian abnormal anticyclone and is influenced by the negative phase mode of EUP, and the large trough in East Asia is weakened, which favors the transport of air pollutants and water vapor to Northeast China, increasing the frequency of haze events in autumn and winter in this region.

Key words: Haze day, Arctic sea ice, Atmospheric circulation

CLC Number:

P461⁺.6/X513

Di WANG,Zhen WANG,Lan LI,Li SUN,Xin MENG,Nan-shu XIAO,Dong-jun YANG. Variation of haze days in Northeast China in autumn and winter and its relationship with Arctic sea ice from 1981 to 2018[J]. Journal of Meteorology and Environment, 2022, 38(4): 67-75.

Figures/Tables 10

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Variation of haze days in Northeast China in autumn and winter and its relationship with Arctic sea ice from 1981 to 2018

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