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J Environ Sci (China)

Title:		Improved atmospheric mercury simulation using updated gas-particle partition and organic aerosol concentrations
Author(s):		Liu K; Wu Q; Wang S; Chang X; Tang Y; Wang L; Liu T; Zhang L; Zhao Y; Wang Q; Chen J;
Address:		"State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China. Electronic address: shxwang@tsinghua.edu.cn. Institute of Atmospheric Environment, Guangdong provincial academy of environmental science, Guangzhou 510045, China. China National Environmental Monitoring Centre, Beijing 100012, China. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China. Center for Excellence in Regional Atmos. Environ., Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China"
Journal Title:		J Environ Sci (China)
Year:		2022
Volume:		20220414
Issue:
Page Number:		106 - 118
DOI:		10.1016/j.jes.2022.04.007
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"The gaseous or particulate forms of divalent mercury (Hg(II)) significantly impact the spatial distribution of atmospheric mercury concentration and deposition flux (FLX). In the new nested-grid GEOS-Chem model, we try to modify the Hg(II) gas-particle partitioning relationship with synchronous and hourly observations at four sites in China. Observations of gaseous oxidized Hg (GOM), particulate-bound Hg (PBM), and PM(2.5) were used to derive an empirical gas-particle partitioning coefficient as a function of temperature (T) and organic aerosol (OA) concentrations under different relative humidity (RH). Results showed that with increasing RH, the dominant process of Hg(II) gas-particle partitioning changed from physical adsorption to chemical desorption. And the dominant factor of Hg(II) gas-particle partitioning changed from T to OA concentrations. We thus improved the simulated OA concentration field by introducing intermediate-volatility and semi-volatile organic compounds (I/SVOCs) emission inventory into the model framework and refining the volatile distributions of I/SVOCs according to new filed tests in the recent literatures. Finally, normalized mean biases (NMBs) of monthly gaseous element mercury (GEM), GOM, PBM, WFLX were reduced from -33%-29%, 95%-300%, 64%-261%, 117%-122% to -13%-0%, -20%-80%, -31%-50%, -17%-23%. The improved model explains 69%-98% of the observed atmospheric Hg decrease during 2013-2020 and can serve as a useful tool to evaluate the effectiveness of the Minamata Convention on Mercury"
Keywords:		Aerosols *Air Pollutants/analysis Dust Environmental Monitoring/methods Gases *Mercury/analysis Atmospheric mercury HgII gas-particle partitioning Mercury deposition flux.Nested GEOS-Chem model Organic aerosol;
Notes:		"MedlineLiu, Kaiyun Wu, Qingru Wang, Shuxiao Chang, Xing Tang, Yi Wang, Long Liu, Tonghao Zhang, Lei Zhao, Yu Wang, Qin'geng Chen, Jinsheng eng Netherlands 2022/08/08 J Environ Sci (China). 2022 Sep; 119:106-118. doi: 10.1016/j.jes.2022.04.007. Epub 2022 Apr 14"