Zhong, Y; Liu, Y; Gong, X; Wilson, D; Lu, Z; Liu, J; Song, T; ... Liu, Q; + view all Zhong, Y; Liu, Y; Gong, X; Wilson, D; Lu, Z; Liu, J; Song, T; Gorbarenko, S; Shi, X; Yang, X; Liu, Q; - view fewer (2021) Coupled impacts of atmospheric circulation and sea-ice on late Pleistocene terrigenous sediment dynamics in the subarctic Pacific Ocean. Geophysical Research Letters , 48 (19) , Article e2021GL095312. 10.1029/2021GL095312.

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Abstract

Processes controlling environmental change in the subarctic Pacific Ocean on millennial to orbital timescales are not well understood. Here we use a 230-kyr sedimentary record from the northwest Pacific Ocean to assess the response of late Pleistocene sediment dynamics to orbital forcing. Combining a source-to-sink perspective based on sedimentological records with climate model reanalysis, we reveal that fluctuations in sediment provenance were closely linked to obliquity-forced changes in atmospheric circulation modes. Specifically, the position of the Aleutian Low controlled sediment transport from the Bering Sea and Aleutian Arc sources. Furthermore, a distinct shift in North Pacific ocean circulation during the Last Glacial Maximum may have been related to a strengthened Siberian High. The coincidence of atmospheric mode switches with changes in sea-ice extent and North Pacific Intermediate Water formation in the marginal seas suggests that this coupled ocean-atmosphere system may have acted as a regional amplifier of global climate variability.

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