Abstract
Haze pollution in early winter (December and January) in the Yangtze River Delta (YRD) and in North China (NC) are both severe; however, their monthly variations are significantly different. In this study, the dominant large-scale atmospheric circulations and local meteorological conditions were investigated and compared over the YRD and NC in each month. Results showed that the YRD (NC) is dominated by the so-called Scandinavia (East Atlantic/West Russia) pattern in December, and these circulations weaken in January. The East Asian December and January monsoons over the YRD and NC have negative correlations with the number of haze days. The local descending motion facilitates less removal of haze pollution over the YRD, while the local ascending motion facilitates less removal of haze pollution over NC in January, despite a weaker relationship in December. Additionally, the monthly variations of atmospheric circulations showed that adverse meteorological conditions restrict the vertical (horizontal) dispersion of haze pollution in December (January) over the YRD, while the associated local weather conditions are similar in these two months over NC.
摘要
长三角和华北地区初冬 (12月和1月) 霾污染均较严重, 但月变化差异显著. 我们从逐月的角度分析并对比了两个地区主要的大尺度大气环流异常和局地的气象条件. 结果表明12月的长三角 (华北) 的霾污染主要受到 Scandinavia (East Atlantic/West Russia) 遥相关的调制, 而到1月这两个环流模态的影响都在减弱; 在1月, 局地下沉运动异常会降低长三角地区霾污染的清除能力, 而上升运动异常能够降低华北地区霾污染的清除能力, 这与气候背景的差异有关; 与此不同, 12月垂直运动和霾污染的清除关系较弱一些. 此外, 分析表明, 12月和1月不利气象条件分别主要限制了长三角地区霾污染的垂直和水平扩散, 而影响华北地区霾污染的局地条件在这两个月却比较类似.
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Acknowledgements
This research was supported by the National Key Research and Development Plan (Grant No. 2016YFA0600703), the National Natural Science Foundation of China (Grant Nos. 91744311, 41991283 and 41705058), and the funding of the Jiangsu Innovation & Entrepreneurship Team.
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Article Highlights
• Atmospheric circulations influence the monthly variations of haze in the YRD and NC.
• Large-scale atmospheric circulations and local meteorological conditions associated with the number of December (January) haze days in the YRD and NC are compared.
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Monthly Variations of Atmospheric Circulations Associated with Haze Pollution in the Yangtze River Delta and North China
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Zhang, X., Yin, Z., Wang, H. et al. Monthly Variations of Atmospheric Circulations Associated with Haze Pollution in the Yangtze River Delta and North China. Adv. Atmos. Sci. 38, 569–580 (2021). https://doi.org/10.1007/s00376-020-0227-z
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DOI: https://doi.org/10.1007/s00376-020-0227-z