Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1072
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
02 Jan 2017
Review status
A revision of this discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Air Stagnations for China (1985–2014): Climatological Mean Features and Trends
Qianqian Huang, Xuhui Cai, Yu Song, and Tong Zhu College of Environmental Sciences and Engineering, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Peking University, Beijing, 100871, China
Abstract. Air stagnation is an important meteorological measurement for unfavourable air pollution conditions, but little is known about it in China. We conducted a comprehensive investigation of air stagnation in China, based on sounding and surface observations of 81 stations, from January 1985 to December 2014. The stagnation criteria were revised to be topographically dependent for the great physical diversity in this country. It is found that the annual mean air stagnation occurrences are closely related to general topography and climate features. Two basins in the northwest and southwest of China—Tarim and Sichuan Basins—exhibit the most frequent stagnation occurrence (50 % days per year), whereas two plateaus (Tibet-Qinghai and Inner Mongolia Plateau) and the east coastal areas experience the least (20 % days per year). Over the whole country, air stagnations achieve maxima in summer and minima in winter, except for Urumqi, a major city in the northwest of China, where stagnations keep a rather constant value yearly around with a minimum in spring. There is a nationwide positive trend in stagnation occurrence during 1985–2014, with the strongest increasing centres over Shandong Peninsula in eastern China and the south of Shaanxi in central China. Dependence degrees of air stagnations on three components (upper- and lower-air winds, precipitation-free days) are examined. It shows that the spatial distribution and trend of air stagnations are mainly driven by the behaviours of upper-air wind speeds.

Citation: Huang, Q., Cai, X., Song, Y., and Zhu, T.: Air Stagnations for China (1985–2014): Climatological Mean Features and Trends, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1072, in review, 2017.
Qianqian Huang et al.
Qianqian Huang et al.
Qianqian Huang et al.

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Short summary
Air stagnation is an important meteorological measurement for unfavorable air pollution conditions. Previous studies found that stagnation events are usually related to air pollution episodes. Now China is experiencing heavy air pollutions, but to our knowledge, little is known about air stagnations of this country. In this manuscript, we conducted a comprehensive investigation of air stagnation climatology in China, based on sounding and surface observations across the country.
Air stagnation is an important meteorological measurement for unfavorable air pollution...
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