Decadal changes of connections among late-spring snow cover in West Siberia, summer Eurasia teleconnection and O 3-related meteorology in North China

Yin, Zhicong; Wan, Yu; Wang, Huijun

Severe surface ozone (Oinline-formula3) pollution frequently occurred in North China and obviously damages human health and ecosystems. The meteorological conditions effectively modulate the variations in Oinline-formula3 pollution. In this study, the interannual relationship between Oinline-formula3-related meteorology and late-spring snow cover in West Siberia was explored, and the reasons for its decadal change were also physically explained. Before mid-1990s, less snow cover could enhance net heat flux and stimulate positive phase of the Eurasian (EU) teleconnection in summer. The positive EU pattern resulted in hot, dry air and intense solar radiation in North China, which could enhance the natural emissions of Oinline-formula3 precursors and photochemical reactions in the atmosphere closely related to high Oinline-formula3 concentrations. However, after the mid-1990s, the southern edge of the dense snow cover area in West Siberia shifted northward by approximately 2inline-formula in latitude and accompanied radiation and heat flux also retreated toward the polar region. The connections among snow anomalies, EU pattern and surface Oinline-formula3 became insignificant and thus influenced the stability of the predictability.

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Yin, Zhicong / Wan, Yu / Wang, Huijun: Decadal changes of connections among late-spring snow cover in West Siberia, summer Eurasia teleconnection and O3-related meteorology in North China. 2021. Copernicus Publications.

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