Retrieval of surface PM2.5 mass concentrations over North China using visibility measurements and GEOS-Chem simulations

Autor: Jintai Lin, Sixuan Li, Yanfeng Huo, Ruijing Ni, Hongjian Weng, Gang Huang, Yonghong Wang, Zifa Wang, Lulu Chen, Mengyao Liu, Jingxu Wang, Yingying Yan
Přispěvatelé: INAR Physics
Rok vydání: 2020
Předmět:
Zdroj: Atmospheric Environment. 222:117121
ISSN: 1352-2310
DOI: 10.1016/j.atmosenv.2019.117121
Popis: Despite much effort made in studying human health associated with fine particulate matter (PM2.5), our knowledge about PM2.5 and human health from a long-term perspective is still limited by inadequately long data. Here, we presented a novel method to retrieve surface PM2.5 mass concentrations using surface visibility measurements and GEOS-Chem model simulations. First, we used visibility measurements and the ratio of PM2.5 and aerosol extinction coefficient (AEC) in GEOS-Chem to calculate visibility-inferred PM2.5 at individual stations (SC-PM2.5). Then we merged SC-PM2.5 with the spatial pattern of GEOS-Chem modeled PM2.5 to obtain a gridded PM2.5 dataset (GC-PM2.5). We validated the GC-PM2.5 data over the North China Plain on a 0.3125° longitude x 0.25° latitude grid in January, April, July and October 2014, using ground-based PM2.5 measurements. The spatial patterns of temporally averaged PM2.5 mass concentrations are consistent between GC-PM2.5 and measured data with a correlation coefficient of 0.79 and a linear regression slope of 0.8. The spatial average GC-PM2.5 data reproduce the day-to-day variation of observed PM2.5 concentrations with a correlation coefficient of 0.96 and a slope of 1.0. The mean bias is less than 12 μg/m3 (
Databáze: OpenAIRE
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