Impact of synoptic circulation pattern on boundary layer structure and PM2.5 during wintertime haze pollution in Shanghai

Authors: Ning Liu*, Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Sha Zhou, Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Chaoshun Liu, Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Jianping Guo, State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences
Topics: Environmental Science, Climatology and Meteorology
Keywords: aerosol pollution, circulation pattern, planetary boundary layer,Shanghai
Session Type: Paper
Day: 4/5/2019
Start / End Time: 9:55 AM / 11:35 AM
Room: 8229, Park Tower Suites, Marriott, Lobby Level
Presentation File: No File Uploaded


The wintertime synoptic circulation patterns in Shanghai have been classified into seven types using obliquely rotated Principal Components in T-mode (PCT) method based to the geopotential data at 925hPa. As planetary boundary layer (PBL) plays an important role in aerosol pollution, the structure of PBL in these patterns, including the planetary boundary layer height (PBLH), relative humid (RH), temperature, inversion base height, inversion intensity, were observed using fine-resolution sounding data and the relationship between PM2.5 concentrations and PBL was analyzed. The result showed that haze pollution had great differences among seven circulation patterns. Three typical patterns, west, southwest and south high pressure were related to high PM2.5 concentrations. The air masses from northwest region of China brought pollutants to Shanghai and cause severe pollutions while the northeast wind and southeast wind were related to clear air. PM2.5 concentrations were anti-correlated with PBLH (R=-0.2577 at 8:00 BJT; R=-0.3235 at 20:00 BJT). Southwest and south high pressure were related to low PBLH, low inversion base height and high inversion intensity. The stable PBL avoid the spread of pollutants and cause severe aerosol pollution.

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