DOI: 10.1002/2017MS001161
Scopus记录号: 2-s2.0-85045657622
论文题名: Evaluation of CMAQ Coupled With a State-of-the-Art Mercury Chemical Mechanism (CMAQ-newHg-Br)
作者: Ye Z ; , Mao H ; , Driscoll C ; T ; , Wang Y ; , Zhang Y ; , Jaeglé L
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
卷: 10, 期: 3 起始页码: 668
结束页码: 690
语种: 英语
英文关键词: Air quality
; Atmospheric chemistry
; Bromine
; Deposition
; Boundary concentrations
; Community multi-scale air quality models
; Gaseous elemental mercury
; Gaseous oxidized mercuries
; Particulate bound mercury
; State-of-the-art algorithms
; Three dimensional chemicals
; Wet and dry
; Bromine compounds
; algorithm
; atmospheric modeling
; bromine
; concentration (composition)
; dry deposition
; flux measurement
; mercury (element)
; seasonal variation
; three-dimensional modeling
; wet deposition
; United States
英文摘要: Most regional three-dimensional chemical transport models neglect gaseous elemental mercury (GEM) oxidation by bromine (Br) radicals and Br chemistry. In this study, the Community Multiscale Air Quality model with its default mercury module (CMAQ-Hg) was modified by implementing a state-of-the-art algorithm depicting Hg reactions coupled with Br chemistry (CMAQ-newHg-Br). Using CMAQ-newHg-Br with initial and boundary concentrations (ICs and BCs) from global model output, we conducted simulations for the northeastern United States over March–November 2010. Simulated GEM mixing ratios were predominantly influenced by BCs and hence reflected significant seasonal variation that was captured in the global model output as opposed to a lack of seasonal variation using CMAQ-Hg's default constant BCs. Observed seasonal percentage changes (i.e., seasonal amplitude [=maximum – minimum] in percentage of the seasonal average) of gaseous oxidized mercury (GOM) and particulate bound mercury (PBM) were 76% and 39%, respectively. CMAQ-newHg-Br significantly improved the simulated seasonal changes in GOM and PBM to 43% and 23%, respectively, from 18% and 16% using CMAQ-Hg. CMAQ-newHg-Br reproduced observed Hg wet deposition with a remarkably low fractional bias (FB; 0.4%) as opposed to a −56% to 19% FB for CMAQ-Hg simulations. Simulated Hg dry deposition using CMAQ-newHg-Br excluding the GEM + OH reaction agreed well with studies using inferential methods and litterfall/throughfall measurements, and the discrepancy varied over 13%–42%. This study demonstrated the promising capability of CMAQ-newHg-Br to reproduce observed concentrations and seasonal variations of GEM, GOM and PBM, and Hg wet and dry deposition fluxes. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75642
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Chemistry, State University of New York College of Environmental Science and Forestry, Syracuse, NY, United States; Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, United States; School of Environmental Science and Engineering, Shandong University, Jinan, Shandong, China; School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu, China; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Ye Z,, Mao H,, Driscoll C,et al. Evaluation of CMAQ Coupled With a State-of-the-Art Mercury Chemical Mechanism (CMAQ-newHg-Br)[J]. Journal of Advances in Modeling Earth Systems,2018-01-01,10(3)