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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

期刊文章

Late-Holocene climatic change recorded in sediment cores from Ellis Fjord, eastern Antarctica  [2001]

McMinn, Andrew; Heijnisj, Henk; Harle, Kate; McOrist, Gordon;

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An analysis of diatom assemblages, Total Organic Carbon (TOC), carbon-nitrogen ratio, δ¹³C, biogenic silica and carboniate in two marine sediment cores from Ellis Fjord, eastern Anitarctica, reveals episodes of climatic change at 3600, 2500. 2000 and 1000 yr BP. Using the diatom data, principal component analysis, the fast-ice index (FI), benthic index (BI) and snow index (SI) (which are derived from the diatom data). a period of reduced temporal sea-ice cover is identified prior to 2500 BP. There was a large increase in sea-ice extent between 2500 and 2000 BP followed by a smaller decline. Tenmporal sea-ice extent after 2000 BP was still significantly greater than prior to 2500 BP. Both cores xvere taken from anoxic basins within the fjJord. It was found that the better preservationi allowed the recognition of taxa such as Clraetocelos vegetative cells, which are inot usually preserved. This enabled the distinction between ice-edge blooms, dominated by Fragilariopsis curta, and open-water blooms dominated by Chaeitoceros. Even though Watts Basin receives a significant summer meltwater input each year, it has not been possible to recognize this signal in the sedimiient core.
来自期刊
Holocene
ISSN : 0959-6836

书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2019
卷:
11
期:
3
范围:
291-300
出版者:
Sage Publications
所有题名:
"Late-Holocene climatic change recorded in sediment cores from Ellis Fjord, eastern Antarctica"@eng
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书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2019
卷:
11
期:
3
范围:
291-300
出版者:
Sage Publications
所有题名:
"Late-Holocene climatic change recorded in sediment cores from Ellis Fjord, eastern Antarctica"@eng