Reorganization of Pacific Deep Waters linked to middle Miocene Antarctic cryosphere expansion: A perspective from the South China Sea

Reorganization of Pacific Deep Waters linked to middle Miocene Antarctic cryosphere expansion: A perspective from the South China Sea
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太平洋深水区的重组与中新世南极冰冻圈扩张有关:来自南海的视角

DOI:
10.1016/j.palaeo.2009.10.019
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发表时间:
2009-12
影响因子:
3
通讯作者:
Wang, Pinxian
Wang, Pinxian
中科院分区:
地球科学2区
文献类型:
--
作者:
Cheng, Xinrong;Zhao, Quanhong;Tian, Jun;Li, Qianyu;Shevenell, Amelia;Wang, Pinxian

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在中中新世气候转型期(~ 14 Ma),中、深海环流的变化可能对全球碳循环和纬向热湿输送起着重要作用。南海中中新世(16- 13 Ma)高分辨率底栖有孔虫稳定同位素记录揭示了一次区域性底沃茨重组,早于全球公认的中中新世δ 18 O增加1‰(13.8Ma)10万年。在ODP 1146(2092米)和1148(3294米; 13.9- 13.5 Ma)站点之间观测到的底栖有孔虫δ 13 C梯度的逆转被解释为反映了低δ 13 C深海(> 2000米)太平洋沃茨向南通量的增加(Flower和肯内特,1993年; Shevenell和肯内特,2004年)。太平洋中层和深海环流的大规模变化,加上蒙特雷碳同位素漂移结束时全球碳循环的增强,可能是地球气候系统的内部反馈。这些反馈降低了南极洲对低纬度热量/湿度的敏感性,并促进了地球气候系统向新的、相对稳定的冰川状态的过渡。
Changes in intermediate and deep ocean circulation likely played a significant role in global carbon cycling and meridional heat/moisture transport during the middle Miocene climate transition (∼14Ma). High-resolution middle Miocene (16–13Ma) benthic foraminifer stable isotope records from the South China Sea reveal a reorganization of regional bottom waters, which preceded the globally recognized middle Miocene ∼1‰ δ18O increase (13.8Ma) by 100,000years. An observed reversal of the benthic foraminifera δ13C gradient between ODP Sites 1146 (2092m) and 1148 (3294m; 13.9–13.5Ma) is interpreted to reflect an increase in the southward flux of low δ13C deep (>2000m) Pacific Ocean waters (Flower and Kennett, 1993; Shevenell and Kennett, 2004). Large-scale changes in Pacific intermediate and deep ocean circulation, coupled with enhanced global carbon cycling at the end of the Monterey Carbon Isotope excursion, likely acted as internal feedbacks to the Earth's climate system. These feedbacks reduced the sensitivity of Antarctica to lower latitude-derived heat/moisture and facilitated the transition of the Earth's climate system to a new, relatively stable glacial state.
DOI: --
发表时间: 2002
影响因子: 1.4
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DOI: 10.1016/j.margeo.2006.05.006
发表时间: 2006-08
期刊: Marine Geology
影响因子: 2.9
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DOI: 10.1029/151gm14
发表时间: 2004-01
期刊: Geophysical monograph
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通讯作者: A. Shevenell;J. Kennett
DOI: 10.1029/pa004i001p00087
发表时间: 1989-02
期刊: Paleoceanography
影响因子: --
作者:
F. Woodruff;S. Savin
通讯作者: F. Woodruff;S. Savin
DOI: 10.1038/284615a0
发表时间: 1980-04
期刊: Nature
影响因子: 64.8
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通讯作者: D. Schnitker