Spatial Distribution and Multiscale Transport Characteristics of PM_(2.5) in China

Qing Wang ； Kun Luo ； Jianren Fan ； Xiang Gao ； Kefa Cen

《Aerosol and Air Quality Research》 19卷9期 (2019/09) Pp. 1993-2007

https://doi.org/10.4209/aaqr.2019.04.0202

摘要

The Weather Research and Forecasting (WRF) model coupled with the Community Multiscale Air Quality (CMAQ) model was used to simulate the temporal and spatial distribution and the multiscale transport patterns of PM_(2.5) in 2 large regions (＂NORTH＂ and ＂SOUTH＂), 7 small regions (＂North,＂ ＂Northeast,＂ ＂East,＂ ＂Center,＂ ＂South,＂ ＂Southwest,＂ and ＂Northwest＂) and 31 provinces in China during January and July of 2015. The simulated PM_(2.5) concentrations were compared with the observed values to assess the accuracy of WRF-CMAQ. During January and July, local emissions contributed the majority of the PM_(2.5), with their percentage exceeding 60% in 7 of the regions. External transport was the dominant source of PM_(2.5) in some of the provinces, such as Shanghai and Qinghai, whereas local emission was the main contributor in others, such as Hebei and Xinjiang. We also identified the primary PM_(2.5) source in each region, the results of which indicated distinctly different regional transport patterns among the provinces and regions of China.

關鍵字

Particulate matter ； Regional transport ； WRF-CMAQ model ； Multiscale regions