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- W3204470982 abstract "Abstract Multi‐AXis Differential Optical Absorption Spectroscopy (MAX‐DOAS) observations were carried out from March 1, 2019 to February 29, 2020 in Qingdao, China, on the coast of the Yellow Sea (120.67°E, 36.35°N). Atmospheric parameters retrieved from the MAX‐DOAS instrument included vertical profiles of aerosol extinction, gaseous aerosol precursors (NO 2 , SO 2 ), and H 2 O. First, the seasonal relationship between aerosol optical depth (AOD) and the H 2 O vertical column density (VCD) was analyzed. The correlation coefficients (r) between AOD and H 2 O VCD were largest in the winter, followed by spring, autumn, and summer. In addition, the correlation during heavily polluted weather was much higher than that during clean weather or slightly polluted weather. Then, an analysis of the wind speed and direction, and trace gas VCDs during the months with frequent pollution (December 2019 and January 2020) found that heavy pollution episodes easily occurred in Qingdao due to a combination of high H 2 O concentrations and low wind speeds. Out of four pollution events (P1, P2, P3, P4), both the H 2 O concentration and pollution were highest during the first event (P1). The H 2 O VCD, AOD, sulfate AOD, and total column HNO 3 simultaneously increased during P1, while the NO 2 and SO 2 VCDs decreased. These trends are consistent with liquid phase reactions. Finally, the 1,000 m backward trajectory for the wind and the gas profiles during P1 revealed that the pollutants increased in Qingdao due to the influence of a polluted air mass from the western inland regions." @default.
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- W3204470982 date "2021-10-11" @default.
- W3204470982 modified "2023-10-06" @default.
- W3204470982 title "Investigation of the Influence of Water Vapor on Heavy Pollution and Its Relationship With AOD Using MAX‐DOAS on the Coast of the Yellow Sea" @default.
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- W3204470982 doi "https://doi.org/10.1029/2020jd034143" @default.
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