气候变化领域集成服务门户(CCPortal): Formation and character of an ancient 19-m ice cover and underlying trapped brine in an "ice-sealed" east Antarctic lake

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DOI	10.1073/pnas.222680999
	Formation and character of an ancient 19-m ice cover and underlying trapped brine in an "ice-sealed" east Antarctic lake
	Doran P.T.; Fritsen C.H.; McKay C.P.; Priscu J.C.; Adams E.E.
发表日期	2003
ISSN	0027-8424
起始页码	26
结束页码	31
卷号	100 期号:1
英文摘要	Lake Vida, one of the largest lakes in the McMurdo Dry Valleys of Antarctica, was previously believed to be shallow (<10 m) and frozen to its bed year-round. New ice-core analysis and temperature data show that beneath 19 m of ice is a water column composed of a NaCl brine with a salinity seven times that of seawater that remains liquid below - 10°C. The ice cover thickens at both its base and surface, sealing concentrated brine beneath. The ice cover is stabilized by a negative feedback between ice growth and the freezing-point depression of the brine. The ice cover contains frozen microbial mats throughout that are viable after thawing and has a history that extends to at least 2,800 14C years B.P., suggesting that the brine has been isolated from the atmosphere for as long. To our knowledge, Lake Vida has the thickest subaerial lake ice cover recorded and may represent a previously undiscovered end-member lacustrine ecosystem on Earth.
语种	英语
scopus关键词	ice; Antarctica; article; astronomy; environmental temperature; freezing; history; lake ecosystem; liquid; microflora; priority journal; thawing; water content
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159012
作者单位	Doran, P.T.; Fritsen, C.H.; McKay, C.P.; Priscu, J.C.; Adams, E.E.
推荐引用方式 GB/T 7714	Doran P.T.,Fritsen C.H.,McKay C.P.,et al. Formation and character of an ancient 19-m ice cover and underlying trapped brine in an "ice-sealed" east Antarctic lake[J],2003,100(1).
APA	Doran P.T.,Fritsen C.H.,McKay C.P.,Priscu J.C.,&Adams E.E..(2003).Formation and character of an ancient 19-m ice cover and underlying trapped brine in an "ice-sealed" east Antarctic lake.Proceedings of the National Academy of Sciences of the United States of America,100(1).
MLA	Doran P.T.,et al."Formation and character of an ancient 19-m ice cover and underlying trapped brine in an "ice-sealed" east Antarctic lake".Proceedings of the National Academy of Sciences of the United States of America 100.1(2003).