| Title | Sub-synoptic evolution of PM2.5 pollution patterns in the Huaihe River Basin, China |
| Authors | Hu, Xun Cai, Xuhui Cai, Yujie Bai, Haodong Wang, Xiaobin Jin, Xipeng Yan, Yan Yu, Mingyuan Song, Yu |
| Affiliation | Peking Univ, Coll Emironmental Sci & Engn, State Key Lab Environm Simulat & Pollut Control, Beijing 100871, Peoples R China China Meteorol Adm, Weather Modificat Ctr, Beijing 100081, Peoples R China Nanjing Univ Informat Sci & Technol, Sch Appl Meteorol, Nanjing 210044, Peoples R China |
| Keywords | AIR-POLLUTION METEOROLOGICAL CONDITIONS CIRCULATION PATTERNS POLLUTANTS DELTA CLASSIFICATIONS CLIMATOLOGY ASSOCIATION MECHANISM TRANSPORT |
| Issue Date | Mar-2023 |
| Publisher | ATMOSPHERIC POLLUTION RESEARCH |
| Abstract | Predominant weather patterns and their evolution along with pollution episodes are identified in the Huaihe River Basin (HRB) in eastern China. Typical PM2,S pollution episodes in autunm and winter were defined firstly. Surface and upper-air meteorological data (winds, temperature/potential temperature, pressure and humidity) and observed PM2.5 pollution data from 2015 to 2019 were employed. Hourly maps of PM2.5 concentration and meteorological fields were acquired and inspected manually. Four predominant weather patterns were identified, two characterized by low-pressure and two by high-pressure systems. Usually, low-pressure patterns are asso-ciated with weak winds or horizontal wind shear at surface, favoring the accumulation of pollutants; high-pressure patterns induce strong persistent northerlies at surface, transporting pollutants from the north at first and removing them later. However, strong low-pressure patterns (weak high-pressure patterns) may also lead to the removal (accumulation) of pollutants. In the upper air, low-pressure (high-pressure) patterns often corre-spond to warm (cold) advection. Four routines of synoptic evolution in the HRB were concluded according to the appearance order of different pressure patterns, namely low-high (Routine-1), low-high-low-high (Routine-2), high-low-high (Routine-3) and a consistent high or low (Routine-4). These routines account for 39%, 33%, 17% and 11% of total episodes, respectively. Lows and weak highs (strong highs) often appeared in the formation (clean-up) stages of pollution episodes. Four, three and no more than two pressure patterns appear in Routine-2, Routine-3 and Routine-1/Routine-4, corresponding to average duration of pollution episodes about 7, 6 and 4 days. This may imply that frequent changes of synoptic conditions can extend die pollution episodes. |
| URI | http://hdl.handle.net/20.500.11897/672061 |
| ISSN | 1309-1042 |
| DOI | 10.1016/j.apr.2023.101679 |
| Indexed | SCI(E) |
| Appears in Collections: | 其他实验室 环境模拟与污染控制国家重点联合实验室 |
