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
Burke A
中科院分区:
综合性期刊1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

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北太平洋冰川翻转环流的增强导致了变暖、营养限制和大气CO2浓度降低。虽然太平洋是热量和二氧化碳的主要储存库,因此是全球气候系统的重要组成部分,但人们对不同气候条件下的环流知之甚少。在这里,我们提出的证据表明,在末次盛冰期(LGM),北太平洋是更好的通风在中间深度和表面沃茨与较低的营养物质,较高的盐度,和温暖的温度相比,今天。模拟表明,这种模式是很好地解释了增强的太平洋纬向翻转环流(PMOC),它带来了温暖,咸,营养贫乏的副热带沃茨的高纬度地区。LGM的PMOC增强将降低大气中的CO2-部分通过与南大洋的协同作用-并支持稳定的区域气候,这可能有助于白令吉亚的人类居住,以及从亚洲向北美的迁移。
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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