Paleoenviromental Data from Less-Investigated Polar Regions
The Arctic holds extensive records of past climatic and environmental changes. Stable isotope variations in polar ice are in many cases important records of paleoclimatic information. Deep ice cores from Antarctica and Greenland, reaching back through the last glaciation, have provided valuable info...
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ftdtic:ADP007348 2023-05-15T13:38:48+02:00 Paleoenviromental Data from Less-Investigated Polar Regions Vaikmae, Rein AKADEMIYA NAUK ESTONSKOI SSR TARTU INST OF GEOLOGY 1992-03 text/html http://www.dtic.mil/docs/citations/ADP007348 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007348 en eng http://www.dtic.mil/docs/citations/ADP007348 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geography Snow Ice and Permafrost Meteorology *CLIMATE *GLACIERS *GREENLAND *PERMAFROST *STABLE ISOTOPES *POLAR REGIONS CORES COVERINGS DEPTH ICE ICE CAPS INTERVALS ISOTOPES OXYGEN PRECIPITATION PROFILES RECORDS REGIONS SHEETS TIME TIME INTERVALS VARIATIONS WATER WEDGES SYMPOSIA ANTARCTIC REGIONS Component Reports *Paleoenvironmental data Reconstructions Text 1992 ftdtic 2016-02-19T17:39:52Z The Arctic holds extensive records of past climatic and environmental changes. Stable isotope variations in polar ice are in many cases important records of paleoclimatic information. Deep ice cores from Antarctica and Greenland, reaching back through the last glaciation, have provided valuable information about the Earth's climate in the past. This paper discusses the oxygen-18 variations in intermediate-depth ice cores from smaller ice caps of Svalbard, Severnaya Zemlya (North Land) and from the marginal area of the Antarctic ice sheet, covering the time span from 1000 to 8000 years B.P. All profiles studied clearly reflect the main climatic events during this time interval. However, small shifts in time exist between details on different curves. Most probably this is due to certain asynchronity in climatic changes in the various regions. There are extensive areas in the Arctic, especially in its eastern sector, where no glaciers currently exist and, possibly, in some areas never existed in the past either. These are the areas of permafrost where several forms of ice occur Within the ground. The source water for most types of ground ice originates from precipitation, but unlike glacier ice, the range of mechanisms for the formation of ground ice is very large, which considerably complicates the interpretation of their isotopic characteristics. For paleoclimatic and paleopermafrost reconstructions, the isotopic content of polygonal wedge ice seems to be most promising. The attempts to use isotopic records from segregated ice for paleoenvironmental research will also be discussed. This article is from 'Proceedings of the International Conference on the Role of the Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 1990. Volume 2', AD-A253 028, p611-616. See also Volume 1, AD-A253 027. Text Antarc* Antarctic Antarctica Arctic glacier glacier glacier glaciers Greenland Ice Ice Sheet permafrost Severnaya Zemlya Svalbard wedge* Alaska Defense Technical Information Center: DTIC Technical Reports database Antarctic Arctic Fairbanks Greenland Severnaya Zemlya ENVELOPE(98.000,98.000,79.500,79.500) Svalbard The Antarctic |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geography Snow Ice and Permafrost Meteorology *CLIMATE *GLACIERS *GREENLAND *PERMAFROST *STABLE ISOTOPES *POLAR REGIONS CORES COVERINGS DEPTH ICE ICE CAPS INTERVALS ISOTOPES OXYGEN PRECIPITATION PROFILES RECORDS REGIONS SHEETS TIME TIME INTERVALS VARIATIONS WATER WEDGES SYMPOSIA ANTARCTIC REGIONS Component Reports *Paleoenvironmental data Reconstructions |
spellingShingle |
Geography Snow Ice and Permafrost Meteorology *CLIMATE *GLACIERS *GREENLAND *PERMAFROST *STABLE ISOTOPES *POLAR REGIONS CORES COVERINGS DEPTH ICE ICE CAPS INTERVALS ISOTOPES OXYGEN PRECIPITATION PROFILES RECORDS REGIONS SHEETS TIME TIME INTERVALS VARIATIONS WATER WEDGES SYMPOSIA ANTARCTIC REGIONS Component Reports *Paleoenvironmental data Reconstructions Vaikmae, Rein Paleoenviromental Data from Less-Investigated Polar Regions |
topic_facet |
Geography Snow Ice and Permafrost Meteorology *CLIMATE *GLACIERS *GREENLAND *PERMAFROST *STABLE ISOTOPES *POLAR REGIONS CORES COVERINGS DEPTH ICE ICE CAPS INTERVALS ISOTOPES OXYGEN PRECIPITATION PROFILES RECORDS REGIONS SHEETS TIME TIME INTERVALS VARIATIONS WATER WEDGES SYMPOSIA ANTARCTIC REGIONS Component Reports *Paleoenvironmental data Reconstructions |
description |
The Arctic holds extensive records of past climatic and environmental changes. Stable isotope variations in polar ice are in many cases important records of paleoclimatic information. Deep ice cores from Antarctica and Greenland, reaching back through the last glaciation, have provided valuable information about the Earth's climate in the past. This paper discusses the oxygen-18 variations in intermediate-depth ice cores from smaller ice caps of Svalbard, Severnaya Zemlya (North Land) and from the marginal area of the Antarctic ice sheet, covering the time span from 1000 to 8000 years B.P. All profiles studied clearly reflect the main climatic events during this time interval. However, small shifts in time exist between details on different curves. Most probably this is due to certain asynchronity in climatic changes in the various regions. There are extensive areas in the Arctic, especially in its eastern sector, where no glaciers currently exist and, possibly, in some areas never existed in the past either. These are the areas of permafrost where several forms of ice occur Within the ground. The source water for most types of ground ice originates from precipitation, but unlike glacier ice, the range of mechanisms for the formation of ground ice is very large, which considerably complicates the interpretation of their isotopic characteristics. For paleoclimatic and paleopermafrost reconstructions, the isotopic content of polygonal wedge ice seems to be most promising. The attempts to use isotopic records from segregated ice for paleoenvironmental research will also be discussed. This article is from 'Proceedings of the International Conference on the Role of the Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 1990. Volume 2', AD-A253 028, p611-616. See also Volume 1, AD-A253 027. |
author2 |
AKADEMIYA NAUK ESTONSKOI SSR TARTU INST OF GEOLOGY |
format |
Text |
author |
Vaikmae, Rein |
author_facet |
Vaikmae, Rein |
author_sort |
Vaikmae, Rein |
title |
Paleoenviromental Data from Less-Investigated Polar Regions |
title_short |
Paleoenviromental Data from Less-Investigated Polar Regions |
title_full |
Paleoenviromental Data from Less-Investigated Polar Regions |
title_fullStr |
Paleoenviromental Data from Less-Investigated Polar Regions |
title_full_unstemmed |
Paleoenviromental Data from Less-Investigated Polar Regions |
title_sort |
paleoenviromental data from less-investigated polar regions |
publishDate |
1992 |
url |
http://www.dtic.mil/docs/citations/ADP007348 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007348 |
long_lat |
ENVELOPE(98.000,98.000,79.500,79.500) |
geographic |
Antarctic Arctic Fairbanks Greenland Severnaya Zemlya Svalbard The Antarctic |
geographic_facet |
Antarctic Arctic Fairbanks Greenland Severnaya Zemlya Svalbard The Antarctic |
genre |
Antarc* Antarctic Antarctica Arctic glacier glacier glacier glaciers Greenland Ice Ice Sheet permafrost Severnaya Zemlya Svalbard wedge* Alaska |
genre_facet |
Antarc* Antarctic Antarctica Arctic glacier glacier glacier glaciers Greenland Ice Ice Sheet permafrost Severnaya Zemlya Svalbard wedge* Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP007348 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766111273192259584 |