Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea
A marine sediment record from the central Bering Sea, spanning the last 20 thousand years (ka), was studied to unravel the depositional history with regard to terrigenous sediment supply and biogenic sedimentation. Methodic approaches comprised the inference of accumulation rates of siliciclastic an...
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Online Access: | http://dx.doi.org/10.3389/feart.2021.712415 https://www.frontiersin.org/articles/10.3389/feart.2021.712415/full |
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crfrontiers:10.3389/feart.2021.712415 2024-09-15T17:36:30+00:00 Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea Wang, Rong Kuhn, Gerhard Gong, Xun Biskaborn, Boris K. Gersonde, Rainer Lembke-Jene, Lester Lohmann, Gerrit Tiedemann, Ralf Diekmann, Bernhard Bundesministerium für Bildung und Forschung China Scholarship Council 2021 http://dx.doi.org/10.3389/feart.2021.712415 https://www.frontiersin.org/articles/10.3389/feart.2021.712415/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 9 ISSN 2296-6463 journal-article 2021 crfrontiers https://doi.org/10.3389/feart.2021.712415 2024-07-16T04:04:32Z A marine sediment record from the central Bering Sea, spanning the last 20 thousand years (ka), was studied to unravel the depositional history with regard to terrigenous sediment supply and biogenic sedimentation. Methodic approaches comprised the inference of accumulation rates of siliciclastic and biogenic components, grain-size analysis, and (clay) mineralogy, as well as paleoclimatic modelling. Changes in the depositional history provides insight into land-ocean linkages of paleoenvironmental changes. During the finale of the Last Glacial Maximum, the depositional environment was characterized by hemipelagic background sedimentation. A marked change in the terrigenous sediment provenance during the late Heinrich 1 Stadial (15.7–14.5 ka), indicated by increases in kaolinite and a high glaciofluvial influx of clay, gives evidence of the deglaciation of the Brooks Range in the hinterland of Alaska. This meltwater pulse also stimulated the postglacial onset of biological productivity. Glacial melt implies regional climate warming during a time of widespread cooling on the northern hemisphere. Our simulation experiment with a coupled climate model suggests atmospheric teleconnections to the North Atlantic, with impacts on the dynamics of the Aleutian Low system that gave rise to warmer winters and an early onset of spring during that time. The late deglacial period between 14.5 and 11.0 ka was characterized by enhanced fluvial runoff and biological productivity in the course of climate amelioration, sea-level rise, seasonal sea-ice retreat, and permafrost thaw in the hinterland. The latter processes temporarily stalled during the Younger Dryas stadial (12.9-11.7 ka) and commenced again during the Preboreal (earliest Holocene), after 11.7 ka. High river runoff might have fertilized the Bering Sea and contributed to enhanced upper ocean stratification. Since 11.0 ka, advanced transgression has shifted the coast line and fluvial influence of the Yukon River away from the study site. The opening of the Bering Strait ... Article in Journal/Newspaper aleutian low Bering Sea Bering Strait Brooks Range Ice North Atlantic permafrost Sea ice Yukon river Alaska Yukon Frontiers (Publisher) Frontiers in Earth Science 9 |
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Frontiers (Publisher) |
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description |
A marine sediment record from the central Bering Sea, spanning the last 20 thousand years (ka), was studied to unravel the depositional history with regard to terrigenous sediment supply and biogenic sedimentation. Methodic approaches comprised the inference of accumulation rates of siliciclastic and biogenic components, grain-size analysis, and (clay) mineralogy, as well as paleoclimatic modelling. Changes in the depositional history provides insight into land-ocean linkages of paleoenvironmental changes. During the finale of the Last Glacial Maximum, the depositional environment was characterized by hemipelagic background sedimentation. A marked change in the terrigenous sediment provenance during the late Heinrich 1 Stadial (15.7–14.5 ka), indicated by increases in kaolinite and a high glaciofluvial influx of clay, gives evidence of the deglaciation of the Brooks Range in the hinterland of Alaska. This meltwater pulse also stimulated the postglacial onset of biological productivity. Glacial melt implies regional climate warming during a time of widespread cooling on the northern hemisphere. Our simulation experiment with a coupled climate model suggests atmospheric teleconnections to the North Atlantic, with impacts on the dynamics of the Aleutian Low system that gave rise to warmer winters and an early onset of spring during that time. The late deglacial period between 14.5 and 11.0 ka was characterized by enhanced fluvial runoff and biological productivity in the course of climate amelioration, sea-level rise, seasonal sea-ice retreat, and permafrost thaw in the hinterland. The latter processes temporarily stalled during the Younger Dryas stadial (12.9-11.7 ka) and commenced again during the Preboreal (earliest Holocene), after 11.7 ka. High river runoff might have fertilized the Bering Sea and contributed to enhanced upper ocean stratification. Since 11.0 ka, advanced transgression has shifted the coast line and fluvial influence of the Yukon River away from the study site. The opening of the Bering Strait ... |
author2 |
Bundesministerium für Bildung und Forschung China Scholarship Council |
format |
Article in Journal/Newspaper |
author |
Wang, Rong Kuhn, Gerhard Gong, Xun Biskaborn, Boris K. Gersonde, Rainer Lembke-Jene, Lester Lohmann, Gerrit Tiedemann, Ralf Diekmann, Bernhard |
spellingShingle |
Wang, Rong Kuhn, Gerhard Gong, Xun Biskaborn, Boris K. Gersonde, Rainer Lembke-Jene, Lester Lohmann, Gerrit Tiedemann, Ralf Diekmann, Bernhard Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea |
author_facet |
Wang, Rong Kuhn, Gerhard Gong, Xun Biskaborn, Boris K. Gersonde, Rainer Lembke-Jene, Lester Lohmann, Gerrit Tiedemann, Ralf Diekmann, Bernhard |
author_sort |
Wang, Rong |
title |
Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea |
title_short |
Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea |
title_full |
Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea |
title_fullStr |
Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea |
title_full_unstemmed |
Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea |
title_sort |
deglacial land-ocean linkages at the alaskan continental margin in the bering sea |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
http://dx.doi.org/10.3389/feart.2021.712415 https://www.frontiersin.org/articles/10.3389/feart.2021.712415/full |
genre |
aleutian low Bering Sea Bering Strait Brooks Range Ice North Atlantic permafrost Sea ice Yukon river Alaska Yukon |
genre_facet |
aleutian low Bering Sea Bering Strait Brooks Range Ice North Atlantic permafrost Sea ice Yukon river Alaska Yukon |
op_source |
Frontiers in Earth Science volume 9 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2021.712415 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
_version_ |
1810489962938761216 |