Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary
Abstract: Terrigenous sediment parameters in modem sea-bottom samples and sediment cores of the South Atlantic are used to infer variations in detrital sources and modes of terrigenous sediment supply in response to environmental changes through the late Quaternary climate cycles. Mass-accumulation...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.466.4435 2023-05-15T13:49:19+02:00 Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary B. Diekmann D. K. Futterer H. Grobe L C. D. Hillenbr G. Kuhn L K. Michels L R. Petschick M. Pirrung L The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.466.4435 http://epic.awi.de/5029/1/Die2002b.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.466.4435 http://epic.awi.de/5029/1/Die2002b.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://epic.awi.de/5029/1/Die2002b.pdf text ftciteseerx 2016-01-08T06:56:54Z Abstract: Terrigenous sediment parameters in modem sea-bottom samples and sediment cores of the South Atlantic are used to infer variations in detrital sources and modes of terrigenous sediment supply in response to environmental changes through the late Quaternary climate cycles. Mass-accumulation rates of terrigenous sediment and fluxes of ice-rafted detritus are discussed in terms of temporal variations in detrital sediment input from land to sea. Grain-size parameters ofterrigenous mud document the intensity of bottom-water circulation, whereas clay-mineral assemblages constrain the sources and marine transport routes of suspended fine-grained particulates, controlled by the modes of sediment input and patterns of ocean circulation. The results suggest low-frequency East Antarctic ice dynamics with dominant lOO-kyr cycles and high rates of Antarctic Bottom Water formation and iceberg discharge during interglacial times. In contrast, the more subpolar ice masses of the Antarctic Peninsula also respond to short-term climate variability with maximum iceberg discharges during glacial terminations related to the rapid disintegration of advanced ice masses. In the northern Scotia Sea, increased sediment supply from southern South America points to extended ice masses in Patagonia during glacial times. In the southeastern South Atlantic, changes in regio-nal ocean circulation are linked to global thermohaline ocean circulation and are in phase with northern-hemispheric processes of ice build-up and associated formation of North Atlantic Deep Water, which decreased during glacial times and permitted a wider extension of southern-source water masses in the study area. Text Antarc* Antarctic Antarctic Peninsula Iceberg* North Atlantic Deep Water North Atlantic Scotia Sea Unknown Antarctic Antarctic Peninsula Patagonia Scotia Sea The Antarctic |
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English |
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Abstract: Terrigenous sediment parameters in modem sea-bottom samples and sediment cores of the South Atlantic are used to infer variations in detrital sources and modes of terrigenous sediment supply in response to environmental changes through the late Quaternary climate cycles. Mass-accumulation rates of terrigenous sediment and fluxes of ice-rafted detritus are discussed in terms of temporal variations in detrital sediment input from land to sea. Grain-size parameters ofterrigenous mud document the intensity of bottom-water circulation, whereas clay-mineral assemblages constrain the sources and marine transport routes of suspended fine-grained particulates, controlled by the modes of sediment input and patterns of ocean circulation. The results suggest low-frequency East Antarctic ice dynamics with dominant lOO-kyr cycles and high rates of Antarctic Bottom Water formation and iceberg discharge during interglacial times. In contrast, the more subpolar ice masses of the Antarctic Peninsula also respond to short-term climate variability with maximum iceberg discharges during glacial terminations related to the rapid disintegration of advanced ice masses. In the northern Scotia Sea, increased sediment supply from southern South America points to extended ice masses in Patagonia during glacial times. In the southeastern South Atlantic, changes in regio-nal ocean circulation are linked to global thermohaline ocean circulation and are in phase with northern-hemispheric processes of ice build-up and associated formation of North Atlantic Deep Water, which decreased during glacial times and permitted a wider extension of southern-source water masses in the study area. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
B. Diekmann D. K. Futterer H. Grobe L C. D. Hillenbr G. Kuhn L K. Michels L R. Petschick M. Pirrung L |
spellingShingle |
B. Diekmann D. K. Futterer H. Grobe L C. D. Hillenbr G. Kuhn L K. Michels L R. Petschick M. Pirrung L Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary |
author_facet |
B. Diekmann D. K. Futterer H. Grobe L C. D. Hillenbr G. Kuhn L K. Michels L R. Petschick M. Pirrung L |
author_sort |
B. Diekmann |
title |
Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary |
title_short |
Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary |
title_full |
Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary |
title_fullStr |
Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary |
title_full_unstemmed |
Terrigenous Sediment Supply in the Polar to Temperate South Atlantic: Land-Ocean Links of Environmental Changes during the Late Quaternary |
title_sort |
terrigenous sediment supply in the polar to temperate south atlantic: land-ocean links of environmental changes during the late quaternary |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.466.4435 http://epic.awi.de/5029/1/Die2002b.pdf |
geographic |
Antarctic Antarctic Peninsula Patagonia Scotia Sea The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Patagonia Scotia Sea The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Iceberg* North Atlantic Deep Water North Atlantic Scotia Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Iceberg* North Atlantic Deep Water North Atlantic Scotia Sea |
op_source |
http://epic.awi.de/5029/1/Die2002b.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.466.4435 http://epic.awi.de/5029/1/Die2002b.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766251174711787520 |