Deep Equatorial Pacific Ocean Oxygenation and Atmospheric CO2 Over The Last Ice Age

Deep Equatorial Pacific Ocean Oxygenation and Atmospheric CO2 Over The Last Ice Age
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最后一个冰河时期赤道太平洋深海氧化和大气二氧化碳

DOI:
10.1038/s41598-020-63628-x
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发表时间:
2020
期刊:
影响因子:
4.6
通讯作者:
Schmidt, Matthew W.
Schmidt, Matthew W.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Marcantonio, Franco;Hostak, Ryan;Hertzberg, Jennifer E.;Schmidt, Matthew W.

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储存在深海中的碳的通风被认为在与更新世冰川消退相关的大气CO2增加中起着重要作用。这种呼吸碳的存在已经被一系列来自全球海洋不同地点的古海洋学代理记录下来。在这里,我们提出了一个新的沉积物芯从东赤道太平洋(EEP)跨越过去18万年,重建高分辨率230 Th衍生通量的232 Th和过剩钡,沿着与氧化还原敏感的铀浓度,以检查过去的变化,粉尘输送,输出生产力,和底层水氧化,分别。我们的底层水氧合记录与来自太平洋和南大洋的其他类似高分辨率记录进行了比较。我们认为,深太平洋是一个网站的呼吸碳存储与全球大气CO2浓度下降的时期在末次盛冰期,证实了以前的大量研究的结论。然而,我们的研究是第一次显示出类似的关系超越了最后一次冰川,延伸到至少7万年。
Ventilation of carbon stored in the deep ocean is thought to play an important role in atmospheric CO2increases associated with Pleistocene deglaciations. The presence of this respired carbon has been recorded by an array of paleoceanographic proxies from various locations across the global ocean. Here we present a new sediment core from the Eastern Equatorial Pacific (EEP) Ocean spanning the last 180,000 years and reconstruct high-resolution230Th-derived fluxes of232Th and excess barium, along with redox-sensitive uranium concentrations to examine past variations in dust delivery, export productivity, and bottom-water oxygenation, respectively. Our bottom-water oxygenation record is compared to other similar high-resolution records from across the Pacific and in the Southern Ocean. We suggest that the deep Pacific is a site of respired carbon storage associated with periods of decreased global atmospheric CO2concentration during the LGM, confirming the conclusions from a wealth of previous studies. However, our study is the first to show a similar relationship beyond the last glacial, extending to at least 70,000 years.
沉积物重新分布过程中的颗粒分选及其对 230Th 归一化质量积累率的影响
DOI: --
发表时间: 2014
期刊:
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DOI: 10.1002/2017pa003155
发表时间: 2017-12-01
期刊: PALEOCEANOGRAPHY
影响因子: --
作者:
de la Fuente, Maria;Calvo, Eva;Cacho, Isabel
通讯作者: Cacho, Isabel