气候变化领域集成服务门户(CCPortal): Biogeochemical Connectivity Between Freshwater Ecosystems beneath the West Antarctic Ice Sheet and the Sub-Ice Marine Environment

CCPortal

DOI	10.1029/2019GB006446
	Biogeochemical Connectivity Between Freshwater Ecosystems beneath the West Antarctic Ice Sheet and the Sub-Ice Marine Environment
	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.
发表日期	2020
ISSN	0886-6236
EISSN	1944-9224
起始页码	no
卷号	34 期号:3
英文摘要	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.
英文关键词	Antarctica; ice-shelf-cavity; organic matter; subglacial
语种	英语
scopus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
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129655
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 K...
推荐引用方式 GB/T 7714	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],2020,34(3).
APA	Vick-Majors T.J..,Michaud A.B..,Skidmore M.L..,Turetta C..,Barbante C..,...&Priscu J.C..(2020).Biogeochemical Connectivity Between Freshwater Ecosystems beneath the West Antarctic Ice Sheet and the Sub-Ice Marine Environment.Global Biogeochemical Cycles,34(3).
MLA	Vick-Majors T.J.,et al."Biogeochemical Connectivity Between Freshwater Ecosystems beneath the West Antarctic Ice Sheet and the Sub-Ice Marine Environment".Global Biogeochemical Cycles 34.3(2020).