Coupled impacts of atmospheric circulation and sea-ice on late Pleistocene terrigenous sediment dynamics in the subarctic Pacific Ocean
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...
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Zenodo
2021
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| Online Access: | https://dx.doi.org/10.5281/zenodo.5111467 https://zenodo.org/record/5111467 |
| Summary: | 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 such coupled ocean-atmosphere system as a amplifier for the regional climate variability from global background. |
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