Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1017/S0954102000000171 |
Sedimentology and geochemistry of a perennially ice-covered epishelf lake in Bunger Hills Oasis, East Antarctica | |
Doran, PT; Wharton, RA; Lyons, WB; Des Marais, DJ; Andersen, DT | |
通讯作者 | Doran, PT |
来源期刊 | ANTARCTIC SCIENCE
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ISSN | 0954-1020 |
出版年 | 2000 |
卷号 | 12期号:2页码:131-140 |
英文摘要 | A process-oriented study was carried out in White Smoke lake, Bunger Hills, East Antarctica, a perennially ice-covered (1.8 to 2.8 m thick) epishelf (tidally-forced) lake. The lake water has a low conductivity and is relatively well mixed. Sediments are transferred from the adjacent glacier to the lake when glacier ice surrounding the sediment is sublimated at the surface and replaced by accumulating ice from below. The lake bottom at the west end of the lake is mostly rocky with a scant sediment cover. The east end contains a thick sediment profile. Grain size and delta(13)C increase with sediment depth, indicating a more proximal glacier ill the past. Sedimentary Pb-210 and Cs-137 signals are exceptionally strong, probably a result of the focusing effect of the large glacial catchment area. The post-bomb and pre-bomb radiocarbon reservoirs are c. 725 C-14 yr and c. 1950 C-14 yr, respectively. Radiocarbon dating indicates that the east end of the lake is >3 ka sp, while photographic evidence and the absence of sediment cover indicate that the west end has formed only over the last century. Our results indicate that the southern ice edge of Bunger Hills has been relatively stable with only minor fluctuations (on the scale of hundreds of metres) over the last 3000 years. |
英文关键词 | Antarctic geochemistry isotopes lake radiocarbon sedimentology |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000087775400002 |
WOS关键词 | MCMURDO DRY VALLEYS ; HOARE ; SEDIMENTATION ; DEGLACIATION ; LIFE ; SNOW |
WOS类目 | Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Physical Geography ; Geology |
来源机构 | Desert Research Institute |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/138553 |
作者单位 | (1)Univ Illinois, Chicago, IL 60607 USA;(2)Univ Nevada, Desert Res Inst, Ctr Biol Sci, Reno, NV 89506 USA;(3)Univ Alabama, Dept Geol, Tuscaloosa, AL 35487 USA;(4)NASA, Ames Res Ctr, Moffett Field, CA 94035 USA |
推荐引用方式 GB/T 7714 | Doran, PT,Wharton, RA,Lyons, WB,et al. Sedimentology and geochemistry of a perennially ice-covered epishelf lake in Bunger Hills Oasis, East Antarctica[J]. Desert Research Institute,2000,12(2):131-140. |
APA | Doran, PT,Wharton, RA,Lyons, WB,Des Marais, DJ,&Andersen, DT.(2000).Sedimentology and geochemistry of a perennially ice-covered epishelf lake in Bunger Hills Oasis, East Antarctica.ANTARCTIC SCIENCE,12(2),131-140. |
MLA | Doran, PT,et al."Sedimentology and geochemistry of a perennially ice-covered epishelf lake in Bunger Hills Oasis, East Antarctica".ANTARCTIC SCIENCE 12.2(2000):131-140. |
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