DOI: 10.1175/JCLI-D-12-00246.1
Scopus记录号: 2-s2.0-84874892990
论文题名: The freshwater system west of the antarctic peninsula: Spatial and temporal changes
作者: Meredith M.P. ; Venables H.J. ; Clarke A. ; Ducklow H.W. ; Erickson M. ; Leng M.J. ; Lenaerts J.T.M. ; Van Den Broeke M.R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 5 起始页码: 1669
结束页码: 1684
语种: 英语
Scopus关键词: Freshwater
; Isotopic analysis
; Ocean circulation
; Snowmelt
; Southern ocean
; Climate change
; Digital storage
; Glacial geology
; Isotopes
; Lasers
; Precipitation (chemical)
; Seawater
; Surveys
; Water
; Sea ice
; climate change
; climate effect
; concentration (composition)
; freshwater ecosystem
; isotopic analysis
; meteoric water
; oceanic circulation
; orographic effect
; oxygen isotope
; precipitation (chemistry)
; sea ice
; seawater
; snowmelt
; spatial variation
; temporal variation
; Antarctic Peninsula
; Antarctica
; Southern Ocean
; West Antarctica
英文摘要: Climate change west of the Antarctic Peninsula is the most rapid of anywhere in the Southern Hemisphere, with associated changes in the rates anddistributions of freshwater inputs to the ocean. Here, results from the first comprehensive survey of oxygen isotopes in seawater in this region are used to quantify spatial patterns of meteoric water (glacial discharge and precipitation) separately from sea ice melt. High levels of meteoric water are found close to the coast, due to orographic effects on precipitation andstrong glacial discharge. Concentrations decrease offshore, driving significant southward geostrophic flows (up tõ30 cm s-1). These produce high meteoric water concentrations at the southern end of the sampling grid, where collapse of the Wilkins Ice Shelf may also have contributed. Sea ice meltconcentrations are lower than meteoric water and patchier because of the mobile nature of the sea ice itself. Nonetheless, net sea ice production in thenorthern part of the sampling grid is inferred; combined with net sea ice melt in the south, this indicates an overall southward ice motion. The survey is contextualized temporally using a decade-long series of isotope data from a coastal Antarctic Peninsula site. This shows a temporal decline inmeteoric water in the upper ocean, contrary to expectations based on increasing precipitation and accelerating deglaciation. This is driven by the increasing occurrence of deeper winter mixed layers and has potential implications for concentrations of trace metals supplied to the euphotic zone by glacial discharge. As the regional freshwater system evolves, the continuing isotope monitoring described here will elucidate the ongoing impacts on climate and the ecosystem. © 2013 American Meteorological. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51983
Appears in Collections: 气候变化事实与影响
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作者单位: British Antarctic Survey, Cambridge, United Kingdom; Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, United States; Department of Geology, University of Leicester, Leicester, NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, United Kingdom; Institute for Marine and Atmospheric Research, Utrecht, Netherlands
Recommended Citation:
Meredith M.P.,Venables H.J.,Clarke A.,et al. The freshwater system west of the antarctic peninsula: Spatial and temporal changes[J]. Journal of Climate,2013-01-01,26(5)