Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content?
Geologic mapping near Windy Creek, Katmai National Park, identified two sets of glacial deposits postdating late-Wisconsin Iliuk moraines and separated from them by volcaniclastic deposits laid down under ice-free conditions. Radiocarbon dating of organic material incorporated in the younger Katolin...
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ftdtic:ADP007351 2023-05-15T16:20:30+02:00 Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? Pinney, DeAnne S. Beget, James E. ALASKA UNIV FAIRBANKS 1992-03 text/html http://www.dtic.mil/docs/citations/ADP007351 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007351 en eng http://www.dtic.mil/docs/citations/ADP007351 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geography Snow Ice and Permafrost Meteorology *ALASKA *GLACIERS *PENINSULAS *CLIMATE *CARBON DIOXIDE ATMOSPHERICS BOUNDARIES CORES DEPOSITION DEPOSITS DRIFT EXPANSION GLACIAL DEPOSITS GLOBAL GREENHOUSES ICE INTENSITY LAKES MAPPING MATERIALS ORGANIC MATERIALS PEAT RADIOCARBON DATING RESPONSE SEDIMENTS TRANSIENTS WISCONSIN SYMPOSIA VOLCANOES Component Reports *Deglaciation *Pleistocene *Holocene *Readvances *Solar intensity Greenhouse gases Text 1992 ftdtic 2016-02-19T17:39:52Z Geologic mapping near Windy Creek, Katmai National Park, identified two sets of glacial deposits postdating late-Wisconsin Iliuk moraines and separated from them by volcaniclastic deposits laid down under ice-free conditions. Radiocarbon dating of organic material incorporated in the younger Katolinat till and in adjacent peat and lake sediments suggests that alpine glaciers on the northern Alaska Peninsula briefly expanded between ca. 8500 and 10,000 years B.P. Stratigraphic relationships and radiocarbon dates suggest an age for the older Ukak drift near the Pleistocene-Holocene boundary between ca. 10,000 and 12,000 years B.P. We suggest that rapid deglaciation following deposition of the Iliuk drift occurred ca. 13,000-12,000 years B.P. in response to large increases in global atmospheric greenhouse gas content, including C02. Short-term decreases in these concentrations, as recorded in polar ice cores, may be linked with brief periods of glacier expansion during the latest Pleistocene and early Holocene. A transient episode of low solar intensity may also have occurred during parts of the early Holocene. Rapid environmental changes and glacial fluctuations on the Alaska Peninsula may have been in response to transient changes in the concentration of atmospheric greenhouse gases and solar intensity. This article is from 'Proceedings of the International Conference on the Role of Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 1990. Volume 2', AD-A253 028, p634-640. See also Volume 1, AD-A253 027. Text glacier glaciers Ice permafrost Alaska Defense Technical Information Center: DTIC Technical Reports database Fairbanks |
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 *ALASKA *GLACIERS *PENINSULAS *CLIMATE *CARBON DIOXIDE ATMOSPHERICS BOUNDARIES CORES DEPOSITION DEPOSITS DRIFT EXPANSION GLACIAL DEPOSITS GLOBAL GREENHOUSES ICE INTENSITY LAKES MAPPING MATERIALS ORGANIC MATERIALS PEAT RADIOCARBON DATING RESPONSE SEDIMENTS TRANSIENTS WISCONSIN SYMPOSIA VOLCANOES Component Reports *Deglaciation *Pleistocene *Holocene *Readvances *Solar intensity Greenhouse gases |
spellingShingle |
Geography Snow Ice and Permafrost Meteorology *ALASKA *GLACIERS *PENINSULAS *CLIMATE *CARBON DIOXIDE ATMOSPHERICS BOUNDARIES CORES DEPOSITION DEPOSITS DRIFT EXPANSION GLACIAL DEPOSITS GLOBAL GREENHOUSES ICE INTENSITY LAKES MAPPING MATERIALS ORGANIC MATERIALS PEAT RADIOCARBON DATING RESPONSE SEDIMENTS TRANSIENTS WISCONSIN SYMPOSIA VOLCANOES Component Reports *Deglaciation *Pleistocene *Holocene *Readvances *Solar intensity Greenhouse gases Pinney, DeAnne S. Beget, James E. Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? |
topic_facet |
Geography Snow Ice and Permafrost Meteorology *ALASKA *GLACIERS *PENINSULAS *CLIMATE *CARBON DIOXIDE ATMOSPHERICS BOUNDARIES CORES DEPOSITION DEPOSITS DRIFT EXPANSION GLACIAL DEPOSITS GLOBAL GREENHOUSES ICE INTENSITY LAKES MAPPING MATERIALS ORGANIC MATERIALS PEAT RADIOCARBON DATING RESPONSE SEDIMENTS TRANSIENTS WISCONSIN SYMPOSIA VOLCANOES Component Reports *Deglaciation *Pleistocene *Holocene *Readvances *Solar intensity Greenhouse gases |
description |
Geologic mapping near Windy Creek, Katmai National Park, identified two sets of glacial deposits postdating late-Wisconsin Iliuk moraines and separated from them by volcaniclastic deposits laid down under ice-free conditions. Radiocarbon dating of organic material incorporated in the younger Katolinat till and in adjacent peat and lake sediments suggests that alpine glaciers on the northern Alaska Peninsula briefly expanded between ca. 8500 and 10,000 years B.P. Stratigraphic relationships and radiocarbon dates suggest an age for the older Ukak drift near the Pleistocene-Holocene boundary between ca. 10,000 and 12,000 years B.P. We suggest that rapid deglaciation following deposition of the Iliuk drift occurred ca. 13,000-12,000 years B.P. in response to large increases in global atmospheric greenhouse gas content, including C02. Short-term decreases in these concentrations, as recorded in polar ice cores, may be linked with brief periods of glacier expansion during the latest Pleistocene and early Holocene. A transient episode of low solar intensity may also have occurred during parts of the early Holocene. Rapid environmental changes and glacial fluctuations on the Alaska Peninsula may have been in response to transient changes in the concentration of atmospheric greenhouse gases and solar intensity. This article is from 'Proceedings of the International Conference on the Role of Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 1990. Volume 2', AD-A253 028, p634-640. See also Volume 1, AD-A253 027. |
author2 |
ALASKA UNIV FAIRBANKS |
format |
Text |
author |
Pinney, DeAnne S. Beget, James E. |
author_facet |
Pinney, DeAnne S. Beget, James E. |
author_sort |
Pinney, DeAnne S. |
title |
Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? |
title_short |
Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? |
title_full |
Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? |
title_fullStr |
Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? |
title_full_unstemmed |
Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? |
title_sort |
deglaciation and latest pleistocene and early holocene glacier readvances on the alaska peninsula: records of rapid climate change due to transient changes, in solar intensity and atmospheric co2 content? |
publishDate |
1992 |
url |
http://www.dtic.mil/docs/citations/ADP007351 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007351 |
geographic |
Fairbanks |
geographic_facet |
Fairbanks |
genre |
glacier glaciers Ice permafrost Alaska |
genre_facet |
glacier glaciers Ice permafrost Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP007351 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766008422973571072 |