DOI: 10.1002/jgrd.50169
论文题名: Comparisons of mercury sources and atmospheric mercury processes between a coastal and inland site
作者: Cheng I. ; Zhang L. ; Blanchard P. ; Dalziel J. ; Tordon R. ; Huang J. ; Holsen T.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 5 起始页码: 2434
结束页码: 2443
语种: 英语
英文关键词: mercury sources
; source-receptor
; speciated mercury
Scopus关键词: Biochemistry
; Coal combustion
; Coastal engineering
; Meteorology
; Ozone
; Principal component analysis
; Sulfur dioxide
; Trace analysis
; Trajectories
; Emissions reduction
; Gaseous elemental mercury
; Gaseous oxidized mercuries
; Principal Components
; Principal components analysis
; Source-receptor
; Speciated mercury
; Water vapor mixing ratio
; Mercury (metal)
; airflow
; atmospheric chemistry
; atmospheric transport
; bioaccumulation
; chemical composition
; coal industry
; coastal zone
; combustion
; comparative study
; concentration (composition)
; condensation
; mercury (element)
; mixing
; mixing ratio
; ozone
; photochemistry
; principal component analysis
; speciation (chemistry)
; troposphere
; water vapor
; wind velocity
; Atlantic Coast [North America]
英文摘要: Comparisons of mercury sources and atmospheric mercury processes were conducted between a coastal and inland site in northeastern North America. Identifying sources of atmospheric Hg is essential for understanding what is potentially contributing to Hg bioaccumulation at these two sites. A data set consisting of gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM), particle-bound mercury, ozone, trace gases, particulate ions, and meteorological data were analyzed using principal components analysis (PCA), absolute principal component scores (APCS), and back trajectories. The PCA factors representing gaseous Hg condensation on particles during winter and combustion and industrial sources were found at both sites. However, the PCA factor for combustion/industrial sources was not found in 2010 at either site, likely because of SO2 emissions reductions from coal utilities from 2008 to 2010. Using APCS and back trajectories, the combustion/industrial factor at the coastal site was narrowed down to shipping ports along the Atlantic coast. Hg sources affecting coastal sites are different from those affecting inland sites because of the influence of marine airflows. GEM evasion from the ocean was evident from a PCA factor containing GEM, relative humidity, wind speed, and precipitation along with significantly higher contributions of this source (APCS) from oceanic trajectories compared to land/coastal trajectories. Analysis of the effects of ozone and water vapor mixing ratio on %GOM/total gaseous mercury suggest that Hg-Br photochemistry occurred at lower ozone concentrations (<40 ppb) at the coastal site and the absence of free troposphere transport of GOM. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63890
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Air Quality Research Division, Science and Technology Branch, Environment Canada, Toronto ON M3H 5T4, Canada; Air Quality Sciences Section, Environment Canada, Dartmouth NS, Canada; Department of Civil and Environmental Engineering, Clarkson University, Potsdam NY, United States
Recommended Citation:
Cheng I.,Zhang L.,Blanchard P.,et al. Comparisons of mercury sources and atmospheric mercury processes between a coastal and inland site[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(5)