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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-783
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 Oct 2018

Research article | 08 Oct 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Response of Early Winter Haze Days in the North China Plain to Autumn Beaufort Sea Ice

Zhicong Yin1,2, Yuyan Li1, and Huijun Wang1,2 Zhicong Yin et al.
  • 1Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 2Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

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 early winter haze days in the North China Plain and the September-October sea ice in the west of the Beaufort Sea (R=0.51). 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 Asia jet stream and a Rossby wave-like train propagated from North China and the Japan Sea, 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 underswing 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.

Zhicong Yin et al.
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Short summary
Recently, haze pollution in the North China has being serious and disastrous. The preceding heavy autumn sea ice intensified the early winter haze pollution over the North China. The results provide possibilities for the seasonal to interannual prediction of haze pollution that helps to determine whether extra stringent emissions control measures are needed to counteract the effect of climate variability.
Recently, haze pollution in the North China has being serious and disastrous. The preceding...
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