globalchange  > 气候变化与战略
DOI: 10.1029/2019GB006446
论文题名:
Biogeochemical Connectivity Between Freshwater Ecosystems beneath the West Antarctic Ice Sheet and the Sub-Ice Marine Environment
作者: Vick-Majors T.J.; Michaud A.B.; Skidmore M.L.; Turetta C.; Barbante C.; Christner B.C.; Dore J.E.; Christianson K.; Mitchell A.C.; Achberger A.M.; Mikucki J.A.; Priscu J.C.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2020
卷: 34, 期:3
语种: 英语
英文关键词: biogeochemistry ; carbon cycle ; coastal water ; connectivity ; discharge ; dissolved organic carbon ; freshwater ecosystem ; ice shelf ; lake water ; marine environment ; subglacial environment ; Antarctic Ice Sheet ; Antarctica ; Ross Ice Shelf ; Siple Coast ; Southern Ocean ; West Antarctic Ice Sheet ; West Antarctica ; Whillans Ice Stream
学科: Antarctica ; ice-shelf-cavity ; organic matter ; subglacial
中文摘要: Although subglacial aquatic environments are widespread beneath the Antarctic ice sheet, subglacial biogeochemistry is not well understood, and the contribution of subglacial water to coastal ocean carbon and nutrient cycling remains poorly constrained. The Whillans Subglacial Lake (SLW) ecosystem is upstream from West Antarctica's Gould-Siple Coast ~800 m beneath the surface of the Whillans Ice Stream. SLW hosts an active microbial ecosystem and is part of an active hydrological system that drains into the marine cavity beneath the adjacent Ross Ice Shelf. Here we examine sources and sinks for organic matter in the lake and estimate the freshwater carbon and nutrient delivery from discharges into the coastal embayment. Fluorescence-based characterization of dissolved organic matter revealed microbially driven differences between sediment pore waters and lake water, with an increasing contribution from relict humic-like dissolved organic matter with sediment depth. Mass balance calculations indicated that the pool of dissolved organic carbon in the SLW water column could be produced in 4.8 to 11.9 yr, which is a time frame similar to that of the lakes’ fill-drain cycle. Based on these estimates, subglacial lake water discharged at the Siple Coast could supply an average of 5,400% more than the heterotrophic carbon demand within Siple Coast embayments (6.5% for the entire Ross Ice Shelf cavity). Our results suggest that subglacial discharge represents a heretofore unappreciated source of microbially processed dissolved organic carbon and other nutrients to the Southern Ocean. ©2020. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160050
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作者单位: Department of Biological Sciences, Michigan Technological University, Houghton, MI, United States; Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, United States; Now at Bigelow Laboratory for Ocean Sciences, East Boothbay, ME, United States; Department of Earth Sciences, Montana State University, Bozeman, MT, United States; Institute for the Dynamics of Environmental Processes—CNR, Venice, Italy; Now at Institute of Polar Sciences, CNR, Venice, Italy; Department of Environmental Sciences, Informatics and Statistics, Ca'Foscari University of Venice, Venice, Italy; Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, United States; Department of Microbiology and Cell Science, Biodiversity Institute, University of Florida, Gainesville, FL, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; Now at Department of Oceanography, Texas AandM University, College Station, TX, United States; Department of Microbiology, University of Tennessee, Knoxville, TN, United States

Recommended Citation:
Vick-Majors T.J.,Michaud A.B.,Skidmore M.L.,et al. Biogeochemical Connectivity Between Freshwater Ecosystems beneath the West Antarctic Ice Sheet and the Sub-Ice Marine Environment[J]. Global Biogeochemical Cycles,2020-01-01,34(3)
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