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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Autores principales:	Rong Wang, Gerhard Kuhn, Xun Gong, Boris K. Biskaborn, Rainer Gersonde, Lester Lembke-Jene, Gerrit Lohmann, Ralf Tiedemann, Bernhard Diekmann
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	North Pacific terrigenous sediments heinrich event brooks range deglaciation meltwater Science Q
Acceso en línea:	https://doaj.org/article/da33cf072f2e433a837342905a4e7119
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spelling	oai:doaj.org-article:da33cf072f2e433a837342905a4e71192021-12-02T11:23:33ZDeglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea2296-646310.3389/feart.2021.712415https://doaj.org/article/da33cf072f2e433a837342905a4e71192021-12-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.712415/fullhttps://doaj.org/toc/2296-6463A 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 strengthened contour currents along the continental slope, leaving behind winnowed sand-rich sediments through the early to mid-Holocene, with non-deposition occurring since about 6.0 ka.Rong WangRong WangGerhard KuhnXun GongBoris K. BiskabornRainer GersondeLester Lembke-JeneGerrit LohmannGerrit LohmannRalf TiedemannRalf TiedemannBernhard DiekmannBernhard DiekmannFrontiers Media S.A.articleNorth Pacificterrigenous sedimentsheinrich eventbrooks rangedeglaciationmeltwaterScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	North Pacific terrigenous sediments heinrich event brooks range deglaciation meltwater Science Q
spellingShingle	North Pacific terrigenous sediments heinrich event brooks range deglaciation meltwater Science Q Rong Wang Rong Wang Gerhard Kuhn Xun Gong Boris K. Biskaborn Rainer Gersonde Lester Lembke-Jene Gerrit Lohmann Gerrit Lohmann Ralf Tiedemann Ralf Tiedemann Bernhard Diekmann Bernhard Diekmann Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea
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 strengthened contour currents along the continental slope, leaving behind winnowed sand-rich sediments through the early to mid-Holocene, with non-deposition occurring since about 6.0 ka.
format	article
author	Rong Wang Rong Wang Gerhard Kuhn Xun Gong Boris K. Biskaborn Rainer Gersonde Lester Lembke-Jene Gerrit Lohmann Gerrit Lohmann Ralf Tiedemann Ralf Tiedemann Bernhard Diekmann Bernhard Diekmann
author_facet	Rong Wang Rong Wang Gerhard Kuhn Xun Gong Boris K. Biskaborn Rainer Gersonde Lester Lembke-Jene Gerrit Lohmann Gerrit Lohmann Ralf Tiedemann Ralf Tiedemann Bernhard Diekmann Bernhard Diekmann
author_sort	Rong Wang
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 S.A.
publishDate	2021
url	https://doaj.org/article/da33cf072f2e433a837342905a4e7119
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Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea

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