AN INVESTIGATION OF A PERENNIALLY FROZEN LAKE
Perennially-frozen Angiussaq Lake, Greenland was examined in 1957 to determine the strength of its midsummer ice cover and the causes of its perennially-frozen conditions. The lake, largest within a 100-mi radius of Thule Air Base, is formed by ice-cap damming of a valley 200 m deep, and has an elev...
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ftdtic:AD0255664 2023-05-15T16:21:31+02:00 AN INVESTIGATION OF A PERENNIALLY FROZEN LAKE BARNES,DAVID F. AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS 1960-12 text/html http://www.dtic.mil/docs/citations/AD0255664 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0255664 en eng http://www.dtic.mil/docs/citations/AD0255664 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS *ICE *LAKES ABLATION BIOLOGY CHEMICAL ANALYSIS GEOLOGY GLACIERS METEOROLOGY PHYSICAL PROPERTIES SURFACE PROPERTIES TEMPERATURE THICKNESS TRAFFICABILITY Text 1960 ftdtic 2016-02-18T15:06:56Z Perennially-frozen Angiussaq Lake, Greenland was examined in 1957 to determine the strength of its midsummer ice cover and the causes of its perennially-frozen conditions. The lake, largest within a 100-mi radius of Thule Air Base, is formed by ice-cap damming of a valley 200 m deep, and has an elevation of 590 m. Water temperatures ranged from 0.1 to 0.7 C and showed that summertime mixing is sufficient to maintain nearly isothermal conditions. Fish, phytoplankton,AND CHIRONOMID LIFE WERE FOUND IN THE LAKE WATER. At the end of the 1957 summer, more than 90% of the lake surface was covered by ice averaging 1.5 m in thickness. Variations in melting rate have caused a gently rolling surface that might be smoothed by flooding or scraping. In-place cantilever beam tests showed that the upper half meter of ice had almost no strength but that the lower portion maintained sufficient strength to support heavy loads throughout the summer. A tongue of glacier ice floating in the lake has a thickness of about 100 m and a length of about 3 km. Five smaller ice islands have thicknesses of more than 5 m and are believed to form where snow accumulation exceeds ablation. (Author) Text glacier Greenland Ice cap Thule Air Thule Air Base Thule Defense Technical Information Center: DTIC Technical Reports database Frozen Lake ENVELOPE(76.108,76.108,-69.415,-69.415) Greenland Ice Lakes ENVELOPE(-131.345,-131.345,60.413,60.413) Thule Air Base ENVELOPE(-68.703,-68.703,76.531,76.531) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
*ICE *LAKES ABLATION BIOLOGY CHEMICAL ANALYSIS GEOLOGY GLACIERS METEOROLOGY PHYSICAL PROPERTIES SURFACE PROPERTIES TEMPERATURE THICKNESS TRAFFICABILITY |
spellingShingle |
*ICE *LAKES ABLATION BIOLOGY CHEMICAL ANALYSIS GEOLOGY GLACIERS METEOROLOGY PHYSICAL PROPERTIES SURFACE PROPERTIES TEMPERATURE THICKNESS TRAFFICABILITY BARNES,DAVID F. AN INVESTIGATION OF A PERENNIALLY FROZEN LAKE |
topic_facet |
*ICE *LAKES ABLATION BIOLOGY CHEMICAL ANALYSIS GEOLOGY GLACIERS METEOROLOGY PHYSICAL PROPERTIES SURFACE PROPERTIES TEMPERATURE THICKNESS TRAFFICABILITY |
description |
Perennially-frozen Angiussaq Lake, Greenland was examined in 1957 to determine the strength of its midsummer ice cover and the causes of its perennially-frozen conditions. The lake, largest within a 100-mi radius of Thule Air Base, is formed by ice-cap damming of a valley 200 m deep, and has an elevation of 590 m. Water temperatures ranged from 0.1 to 0.7 C and showed that summertime mixing is sufficient to maintain nearly isothermal conditions. Fish, phytoplankton,AND CHIRONOMID LIFE WERE FOUND IN THE LAKE WATER. At the end of the 1957 summer, more than 90% of the lake surface was covered by ice averaging 1.5 m in thickness. Variations in melting rate have caused a gently rolling surface that might be smoothed by flooding or scraping. In-place cantilever beam tests showed that the upper half meter of ice had almost no strength but that the lower portion maintained sufficient strength to support heavy loads throughout the summer. A tongue of glacier ice floating in the lake has a thickness of about 100 m and a length of about 3 km. Five smaller ice islands have thicknesses of more than 5 m and are believed to form where snow accumulation exceeds ablation. (Author) |
author2 |
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS |
format |
Text |
author |
BARNES,DAVID F. |
author_facet |
BARNES,DAVID F. |
author_sort |
BARNES,DAVID F. |
title |
AN INVESTIGATION OF A PERENNIALLY FROZEN LAKE |
title_short |
AN INVESTIGATION OF A PERENNIALLY FROZEN LAKE |
title_full |
AN INVESTIGATION OF A PERENNIALLY FROZEN LAKE |
title_fullStr |
AN INVESTIGATION OF A PERENNIALLY FROZEN LAKE |
title_full_unstemmed |
AN INVESTIGATION OF A PERENNIALLY FROZEN LAKE |
title_sort |
investigation of a perennially frozen lake |
publishDate |
1960 |
url |
http://www.dtic.mil/docs/citations/AD0255664 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0255664 |
long_lat |
ENVELOPE(76.108,76.108,-69.415,-69.415) ENVELOPE(-131.345,-131.345,60.413,60.413) ENVELOPE(-68.703,-68.703,76.531,76.531) |
geographic |
Frozen Lake Greenland Ice Lakes Thule Air Base |
geographic_facet |
Frozen Lake Greenland Ice Lakes Thule Air Base |
genre |
glacier Greenland Ice cap Thule Air Thule Air Base Thule |
genre_facet |
glacier Greenland Ice cap Thule Air Thule Air Base Thule |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0255664 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766009519025946624 |