Articles | Volume 21, issue 18
https://doi.org/10.5194/acp-21-14131-2021
https://doi.org/10.5194/acp-21-14131-2021
Research article
 | 
23 Sep 2021
Research article |  | 23 Sep 2021

“Warm cover”: precursory strong signals for haze pollution hidden in the middle troposphere

Xiangde Xu, Wenyue Cai, Tianliang Zhao, Xinfa Qiu, Wenhui Zhu, Chan Sun, Peng Yan, Chunzhu Wang, and Fei Ge

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Cited articles

Cai, M., Ou, J. J., Zhou, Y. Q., Yang Q., and Cai, Z. X.: Discriminating cloud area by using L-band sounding data (in Chinese), Chin. J. Atmos. Sci., 38, 213–222, https://doi.org/10.3878/j.issn.1006-9895.2013.12193, 2014. 
Cai, W. Y., Xu, X. D., Cheng, X. H., Wei, F. Y., Qiu, X. F., and Zhu, W. H.: Impact of “blocking” structure in the troposphere on the wintertime persistent heavy air pollution in northern China, Sci. Total Environ., 741, 140325, https://doi.org/10.1016/j.scitotenv.2020.140325, 2020. 
Cai, W.: Air temperature of surface observation data, Zenodo [data set], https://doi.org/10.5281/zenodo.5371982, 2021a. 
Cai, W.: L-band sounding data, Zenodo [data set], https://doi.org/10.5281/zenodo.5371868, 2021b. 
Cai, W.: The haze days of surface observation data, Zenodo [data set], https://doi.org/10.5281/zenodo.5372006, 2021c. 
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We found that the structure of atmospheric thermodynamics in the troposphere can be regarded as a strong forewarning signal for variations of surface PM2.5 concentration in heavy air pollution.
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