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strong forewarning signalfor the variations of surface PM2.5 concentration in heavy air pollution.
05 Jan 2021
05 Jan 2021
Warm Cover– Precursory
Strong Signalshidden in the Middle Troposphere for Haze Pollution
Abstract. Eastern China (EC), located on the downstream region of Tibetan Plateau (TP), is a large area that has become vulnerable to frequent haze. In addition of air pollutant emissions, meteorological conditions were a key inducement
for air pollution episodes. Based on the study of the Great Smog of London in 1952 and haze pollution in EC over recent decades, it is found that the abnormal warm cover
in the middle troposphere, as a precursory strong signal
hidden, could connect to severe air pollution events. The convection and diffusion in the atmospheric boundary layer (ABL) were suppressed by a relatively stable structure of warm cover
in the middle troposphere, leading to the ABL height decreases, which were favourable for the accumulation of air pollutants in the ambient atmosphere. The warming TP built the warm cover
in the middle troposphere from the plateau to the downstream EC region and even the entire East Asian region. The frequent haze events in EC is connected with a significantly strong warm cover
in the interdecadal variability. It is also revealed that a close relationship existed between interannual variations of the TP's heat source and the warm cover
hidden in the middle troposphere over EC.
Warm Cover– Precursory
Strong Signalshidden in the Middle Troposphere for Haze Pollution, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2020-1140, in review, 2021.
Xiangde Xu et al.
Status: open (until 02 Mar 2021)
Xiangde Xu et al.
Xiangde Xu et al.
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strong forewarning signalfor the variations of surface PM2.5 concentration in heavy air pollution.
An interactive open-access journal of the European Geosciences Union