Deglacial restructuring of the Eastern equatorial Pacific oxygen minimum zone

Deglacial restructuring of the Eastern equatorial Pacific oxygen minimum zone
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赤道东太平洋含氧最低区的冰消重建

DOI:
10.1038/s43247-022-00477-8
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发表时间:
2022
影响因子:
7.9
通讯作者:
Davis, Catherine V.
Davis, Catherine V.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Davis, Catherine V.

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赤道东太平洋的氧化作用对现代海洋中持续的气候变化做出反应,尽管该地区是否出现了冰消作用,最低氧区的范围或位置仍然没有受到很好的限制。在这里,来自居住在最低氧区的浮游有孔虫外壳的稳定同位素被用来重新评估中层最低氧区相对于温跃层和底栖生物的位置。氧同位素记录了氧气最低区向与 Heinrich Stadial 1 相关的温跃层快速浅滩,并在冰消期持续存在。同时,居住在最低氧区的 Globorotaloides hexagonus 和底栖 Cibicidoides wuellerstorfi 之间的碳同位素相似性表明,冰川消融过程中存在着共同的水源。研究结果支持东赤道太平洋在通过冰消、冰消最低氧区扩张以及从冰期到全新世区间中层水氧和碳动态的重组而向大气排放碳方面发挥着直接作用。
Oxygenation in the Eastern Equatorial Pacific is responsive to ongoing climate change in the modern ocean, although whether the region saw a deglacial change in extent or position of the Oxygen Minimum Zone remains poorly constrained. Here, stable isotopes from the shells of an Oxygen Minimum Zone-dwelling planktic foraminifer are used to reassess the position of the mid-water Oxygen Minimum Zone relative to both the thermocline and benthos. Oxygen isotopes record a rapid shoaling of the Oxygen Minimum Zone towards the thermocline associated with Heinrich Stadial 1 and persisting through the deglaciation. Meanwhile, carbon isotope similarities between Oxygen Minimum Zone-dwellingGloborotaloides hexagonusand benthicCibicidoides wuellerstorfisuggest a shared source water through the deglaciation. Results support a direct role for the Eastern Equatorial Pacific in venting carbon to the atmosphere through the deglaciation, a deglacial expansion of the Oxygen Minimum Zone, and a restructuring of mid-water oxygen and carbon dynamics from the glacial to Holocene intervals.
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DOI: --
发表时间: 1992
期刊: Geological Society Special Publication
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