The Record of Global Change in Circum-Antarctic Marine Sediments
Sediment drilling, using rigs located on sea ice inshore, and Ocean Drilling Program facilities farther offshore, have described the stepwise cooling of Antarctica through the Cenozoic, setting the scene for more detailed studies of short-period, recent change. Such studies will not be easy. The vir...
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ftdtic:ADP007344 2023-05-15T13:38:48+02:00 The Record of Global Change in Circum-Antarctic Marine Sediments Barker, P. F. Pudsey, C. J. Larter, R. D. NATURAL ENVIRONMENT RESEARCH COUNCIL LONDON (UNITED KINGDOM) 1992-03 text/html http://www.dtic.mil/docs/citations/ADP007344 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007344 en eng http://www.dtic.mil/docs/citations/ADP007344 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geography Physical and Dynamic Oceanography Snow Ice and Permafrost *OCEAN BOTTOM *RECORDS ACCUMULATION BOTTOM BOTTOM WATERS CARBON CARBONATES CIRCULATION COOLING CYCLES DEEP OCEANS DRILLING FACILITIES FLOW GLOBAL ICE LIMITATIONS OCEAN BASINS OCEAN CURRENTS OCEANS OFFSHORE PISTONS PRODUCTIVITY RATES REGIONS SEA ICE SEDIMENTS SHEETS SLOPE TIME VOLUME WATER WATER FLOW WATER MASSES SYMPOSIA *Global changes Comoponent Reports *Circum Antarctic Marine sediments Stepwise cooling Pelagic sediments Hemipelagic sediments Text 1992 ftdtic 2016-02-19T17:39:52Z Sediment drilling, using rigs located on sea ice inshore, and Ocean Drilling Program facilities farther offshore, have described the stepwise cooling of Antarctica through the Cenozoic, setting the scene for more detailed studies of short-period, recent change. Such studies will not be easy. The virtual absence of carbonate sediments and the strength of bottom currents in some regions are fundamental limitations. Nevertheless, Antarctic ocean sediments contain a record of global change which complements the record of the ice sheet, and extends it back in time. Pelagic and hemipelagic sediments of the ocean basins record changes in primary productivity, dissolution, sea ice extent and the strength of deep ocean circulation, and in the volume of the main circum-Antarctic water masses. Prograded sediments of the Antarctic continental shelf and slope contain a record of glacial/interglacial changes in ice sheet volume. Modern piston-coring techniques are capable of revealing changes over the last glacial cycle in some detail, in suitably expanded sections. At lower sediment accumulation rates, a less detailed but longer record can be obtained. It can already be shown that, at and around glacial maximum, (a) grounded ice sheets extended to the Antarctic continental shelf edge, (b) the marginal sea ice zone lay up to 5 deg farther north, and (c) Weddell Sea Bottom Water flow was far slower than at present. 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, p586-592. See also Volume 1, AD-A253 027. Text Antarc* Antarctic Antarctic Ocean Antarctica Ice Ice Sheet permafrost Sea ice Weddell Sea Alaska Defense Technical Information Center: DTIC Technical Reports database Antarctic The Antarctic Weddell Sea Fairbanks Weddell Antarctic Ocean |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geography Physical and Dynamic Oceanography Snow Ice and Permafrost *OCEAN BOTTOM *RECORDS ACCUMULATION BOTTOM BOTTOM WATERS CARBON CARBONATES CIRCULATION COOLING CYCLES DEEP OCEANS DRILLING FACILITIES FLOW GLOBAL ICE LIMITATIONS OCEAN BASINS OCEAN CURRENTS OCEANS OFFSHORE PISTONS PRODUCTIVITY RATES REGIONS SEA ICE SEDIMENTS SHEETS SLOPE TIME VOLUME WATER WATER FLOW WATER MASSES SYMPOSIA *Global changes Comoponent Reports *Circum Antarctic Marine sediments Stepwise cooling Pelagic sediments Hemipelagic sediments |
spellingShingle |
Geography Physical and Dynamic Oceanography Snow Ice and Permafrost *OCEAN BOTTOM *RECORDS ACCUMULATION BOTTOM BOTTOM WATERS CARBON CARBONATES CIRCULATION COOLING CYCLES DEEP OCEANS DRILLING FACILITIES FLOW GLOBAL ICE LIMITATIONS OCEAN BASINS OCEAN CURRENTS OCEANS OFFSHORE PISTONS PRODUCTIVITY RATES REGIONS SEA ICE SEDIMENTS SHEETS SLOPE TIME VOLUME WATER WATER FLOW WATER MASSES SYMPOSIA *Global changes Comoponent Reports *Circum Antarctic Marine sediments Stepwise cooling Pelagic sediments Hemipelagic sediments Barker, P. F. Pudsey, C. J. Larter, R. D. The Record of Global Change in Circum-Antarctic Marine Sediments |
topic_facet |
Geography Physical and Dynamic Oceanography Snow Ice and Permafrost *OCEAN BOTTOM *RECORDS ACCUMULATION BOTTOM BOTTOM WATERS CARBON CARBONATES CIRCULATION COOLING CYCLES DEEP OCEANS DRILLING FACILITIES FLOW GLOBAL ICE LIMITATIONS OCEAN BASINS OCEAN CURRENTS OCEANS OFFSHORE PISTONS PRODUCTIVITY RATES REGIONS SEA ICE SEDIMENTS SHEETS SLOPE TIME VOLUME WATER WATER FLOW WATER MASSES SYMPOSIA *Global changes Comoponent Reports *Circum Antarctic Marine sediments Stepwise cooling Pelagic sediments Hemipelagic sediments |
description |
Sediment drilling, using rigs located on sea ice inshore, and Ocean Drilling Program facilities farther offshore, have described the stepwise cooling of Antarctica through the Cenozoic, setting the scene for more detailed studies of short-period, recent change. Such studies will not be easy. The virtual absence of carbonate sediments and the strength of bottom currents in some regions are fundamental limitations. Nevertheless, Antarctic ocean sediments contain a record of global change which complements the record of the ice sheet, and extends it back in time. Pelagic and hemipelagic sediments of the ocean basins record changes in primary productivity, dissolution, sea ice extent and the strength of deep ocean circulation, and in the volume of the main circum-Antarctic water masses. Prograded sediments of the Antarctic continental shelf and slope contain a record of glacial/interglacial changes in ice sheet volume. Modern piston-coring techniques are capable of revealing changes over the last glacial cycle in some detail, in suitably expanded sections. At lower sediment accumulation rates, a less detailed but longer record can be obtained. It can already be shown that, at and around glacial maximum, (a) grounded ice sheets extended to the Antarctic continental shelf edge, (b) the marginal sea ice zone lay up to 5 deg farther north, and (c) Weddell Sea Bottom Water flow was far slower than at present. 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, p586-592. See also Volume 1, AD-A253 027. |
author2 |
NATURAL ENVIRONMENT RESEARCH COUNCIL LONDON (UNITED KINGDOM) |
format |
Text |
author |
Barker, P. F. Pudsey, C. J. Larter, R. D. |
author_facet |
Barker, P. F. Pudsey, C. J. Larter, R. D. |
author_sort |
Barker, P. F. |
title |
The Record of Global Change in Circum-Antarctic Marine Sediments |
title_short |
The Record of Global Change in Circum-Antarctic Marine Sediments |
title_full |
The Record of Global Change in Circum-Antarctic Marine Sediments |
title_fullStr |
The Record of Global Change in Circum-Antarctic Marine Sediments |
title_full_unstemmed |
The Record of Global Change in Circum-Antarctic Marine Sediments |
title_sort |
record of global change in circum-antarctic marine sediments |
publishDate |
1992 |
url |
http://www.dtic.mil/docs/citations/ADP007344 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007344 |
geographic |
Antarctic The Antarctic Weddell Sea Fairbanks Weddell Antarctic Ocean |
geographic_facet |
Antarctic The Antarctic Weddell Sea Fairbanks Weddell Antarctic Ocean |
genre |
Antarc* Antarctic Antarctic Ocean Antarctica Ice Ice Sheet permafrost Sea ice Weddell Sea Alaska |
genre_facet |
Antarc* Antarctic Antarctic Ocean Antarctica Ice Ice Sheet permafrost Sea ice Weddell Sea Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP007344 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766111268817600512 |