TY - JOUR A1 - Xu, X. A1 - Cai, W. A1 - Zhao, T. A1 - Qiu, X. A1 - Zhu, W. A1 - Sun, C. A1 - Yan, P. A1 - Wang, C. A1 - Ge, F. T1 - ``Warm Cover'' - Precursory ``Strong Signals'' hidden in the Middle Troposphere for Haze Pollution JO - Atmos. Chem. Phys. Discuss. J1 - ACPD VL - 2021 SP - 1 EP - 15 Y1 - 2021/01/05 PB - Copernicus Publications SN - 1680-7375 UR - https://acp.copernicus.org/preprints/acp-2020-1140/ L1 - https://acp.copernicus.org/preprints/acp-2020-1140/acp-2020-1140.pdf DO - 10.5194/acp-2020-1140 ER -