Response of early winter haze in the North China Plain to autumn Beaufort sea ice

Response of early winter haze in the North China Plain to autumn Beaufort sea ice
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DOI：
10.5194/acp-19-1439-2019
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发表时间：
2019-02
期刊：
Atmospheric Chemistry and Physics
影响因子：
6.3
通讯作者：
Zhicong Yin;Yuyan Li;Huijun Wang
Zhicong Yin;Yuyan Li;Huijun Wang
中科院分区：
地球科学1区
文献类型：
--
作者：
Zhicong Yin;Yuyan Li;Huijun Wang

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抽象的。最近，中国北方的初冬雾霾污染 平原已经严重和灾难性的，极大地损害了人类健康 和社会经济。在本研究中，我们强调了 华北平原初冬灰霾日数与 博福特海西部9 - 10月海冰（R=0.51）通过 观测分析和数值实验。由于有效 辐射冷却，大气环流的响应部分 表现为博福特海表面风速的降低， 阿拉斯加湾，导致随后的海面变暖 十一月白令海和海湾海表温度异常 阿拉斯加充当了桥梁。温暖的海面有效地加热了 在空中，并导致适当的大气背景，以提高 霾天气的可能性（例如，东亚急流减弱， 从华北和日本海传播的波浪状列车，通过 白令海和阿拉斯加湾，科迪勒拉山脉）。附近 海面气压梯度减弱激发异常 在中国沿海地区的南风，并带来了平静， 潮湿的环境形成霾。逆温也是 加强以限制晴朗干燥的高空空气向下输送。因此 水平和垂直扩散都是有限的， 容易积累造成雾霾污染。
Abstract. Recently, early winter haze pollution in the North China Plain has been serious and disastrous, dramatically damaging human health and the social economy. In this study, we emphasized the close connection between the number of haze days in early winter in the North China Plain and the September–October sea ice in the west of the Beaufort Sea (R=0.51) via both observational analyses and numerical experiments. Due to efficient radiative cooling, the responses of atmospheric circulations partially manifested as reductions of surface wind speed over the Beaufort Sea and Gulf of Alaska, resulting in a warmer sea surface in the subsequent November. The sea surface temperature anomalies over the Bering Sea and Gulf of Alaska acted as a bridge. The warmer sea surface efficiently heated the above air and led to suitable atmospheric backgrounds to enhance the potential of haze weather (e.g., a weaker East Asian jet stream and a Rossby wave-like train propagated from North China and the Sea of Japan, through the Bering Sea and Gulf of Alaska, to the Cordillera Mountains). Near the surface, the weakening sea level pressure gradient stimulated anomalous southerlies over the coastal area of China and brought about a calm and moist environment for haze formation. The thermal inversion was also enhanced to restrict the downward transportation of clear and dry upper air. Thus, the horizontal and vertical dispersion were both limited, and the fine particles were apt to accumulate and cause haze pollution.