Overturning circulation, nutrient limitation, and warming in the Glacial North Pacific.
Overturning circulation, nutrient limitation, and warming in the Glacial North Pacific.
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DOI:
10.1126/sciadv.abd1654
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发表时间:
2020-12
期刊:
影响因子:
13.6
通讯作者:
Burke A
中科院分区:
文献类型:
--
作者:
Rae JWB;Gray WR;Wills RCJ;Eisenman I;Fitzhugh B;Fotheringham M;Littley EFM;Rafter PA;Rees-Owen R;Ridgwell A;Taylor B;Burke A
Enhanced overturning circulation in the glacial North Pacific caused warming, nutrient limitation, and lower atmospheric CO2. Although the Pacific Ocean is a major reservoir of heat and CO2, and thus an important component of the global climate system, its circulation under different climatic conditions is poorly understood. Here, we present evidence that during the Last Glacial Maximum (LGM), the North Pacific was better ventilated at intermediate depths and had surface waters with lower nutrients, higher salinity, and warmer temperatures compared to today. Modeling shows that this pattern is well explained by enhanced Pacific meridional overturning circulation (PMOC), which brings warm, salty, and nutrient-poor subtropical waters to high latitudes. Enhanced PMOC at the LGM would have lowered atmospheric CO2—in part through synergy with the Southern Ocean—and supported an equable regional climate, which may have aided human habitability in Beringia, and migration from Asia to North America.
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