DOI: 10.1002/2013GB004689
Scopus记录号: 2-s2.0-84888804825
论文题名: Factors driving mercury variability in the Arctic atmosphere and ocean over the past 30 years
作者: Fisher J ; A ; , Jacob D ; J ; , Soerensen A ; L ; , Amos H ; M ; , Corbitt E ; S ; , Streets D ; G ; , Wang Q ; , Yantosca R ; M ; , Sunderland E ; M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 4 起始页码: 1226
结束页码: 1235
语种: 英语
英文关键词: Arctic
; mercury
Scopus关键词: Arctic
; Arctic atmosphere
; Atmospheric mercury
; Biogeochemical modeling
; Environmental factors
; High temperature
; Interannual variability
; Long-term observations
; Atmospheric temperature
; Balloons
; Biogeochemistry
; Climate models
; Clouds
; Computer simulation
; Mercury (metal)
; Oceanography
; Principal component analysis
; Sea ice
; Sun
; Climate change
; air temperature
; air-sea interaction
; annual variation
; arsenate
; biogeochemistry
; boundary layer
; clear sky
; climate change
; cloud cover
; EOS
; meltwater
; mercury (element)
; sea ice
; seasonality
; solar radiation
; Arctic Ocean
英文摘要: Long-term observations at Arctic sites (Alert and Zeppelin) show large interannual variability (IAV) in atmospheric mercury (Hg), implying a strong sensitivity of Hg to environmental factors and potentially to climate change. We use the GEOS-Chem global biogeochemical Hg model to interpret these observations and identify the principal drivers of spring and summer IAV in the Arctic atmosphere and surface ocean from 1979-2008. The model has moderate skill in simulating the observed atmospheric IAV at the two sites (r ~ 0.4) and successfully reproduces a long-term shift at Alert in the timing of the spring minimum from May to April (r = 0.7). Principal component analysis indicates that much of the IAV in the model can be explained by a single climate mode with high temperatures, low sea ice fraction, low cloudiness, and shallow boundary layer. This mode drives decreased bromine-driven deposition in spring and increased ocean evasion in summer. In the Arctic surface ocean, we find that the IAV for modeled total Hg is dominated by the meltwater flux of Hg previously deposited to sea ice, which is largest in years with high solar radiation (clear skies) and cold spring air temperature. Climate change in the Arctic is projected to result in increased cloudiness and strong warming in spring, which may thus lead to decreased Hg inputs to the Arctic Ocean. The effect of climate change on Hg discharges from Arctic rivers remains a major source of uncertainty. Key Points Arctic mercury (Hg) is simulated using a global biogeochemical model Atmospheric Hg is enhanced by high temperatures, low sea ice, and clear skies Ocean Hg is high under clear skies and cold spring air temperature ©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/77563
Appears in Collections: 气候变化事实与影响
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作者单位: School of Chemistry, University of Wollongong, Northfields Ave., Wollongong, NSW 2522, Australia; School of Engineering and Applied Sciences, Harvard University Massachusetts, Cambridge, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Environmental Health, Harvard School of Public Health, Boston, MA, United States; Decision and Information Sciences Division, Argonne National Laboratory, Argonne, IL, United States
Recommended Citation:
Fisher J,A,, Jacob D,et al. Factors driving mercury variability in the Arctic atmosphere and ocean over the past 30 years[J]. Global Biogeochemical Cycles,2013-01-01,27(4)