Atlantic overturning responses to obliquity and precession over the last 3 Myr
Atlantic overturning responses to obliquity and precession over the last 3 Myr
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DOI：
10.1002/2013pa002505
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
L. Lisiecki
中科院分区：
文献类型：
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作者：
L. Lisiecki
本研究分析了39个大西洋和7个太平洋底栖生物δ 13 C记录，以表征3 Ma以来大西洋翻转的周期性和岁差响应。还分析了区域底栖δ 13 C叠加。在1.5-1.6 Ma观测到轨道响应的主要转变，与北方组分水的第一次冰期变浅相一致。自1.5Ma以来，2300 - 4000 m深度的大西洋底栖δ 13 C记录的相位滞后最大进动59°（6.7 kyr）和6月近日点进动强迫133°（8.5 kyr）。与北大西洋海表温度的比较表明，这些轨道响应（特别是岁差）在中深大西洋δ 13 C与海洋热传输和翻转率的变化。中更新世过渡对底栖δ 13 C的旋进和旋进相位影响不大，但导致0.6Ma时大西洋中深部δ 13 C的旋进功率降低了约50%。
This study analyzes 39 Atlantic and seven Pacific benthic δ13C records to characterize obliquity and precession responses in Atlantic overturning since 3 Ma. Regional benthic δ13C stacks are also analyzed. A major transition in orbital responses is observed at 1.5–1.6 Ma coincident with the first glacial shoaling of Northern Component Water. Since ∼1.5 Ma, the phases of Atlantic benthic δ13C records from 2300 to 4000 m depth lag maximum obliquity by 59° (6.7 kyr) and June perihelion precession forcing by 133° (8.5 kyr). Comparison with North Atlantic sea surface temperature suggests that these orbital responses (particularly precession) in middle deep Atlantic δ13C are associated with changes in ocean heat transport and overturning rates. The mid-Pleistocene transition had little effect on the obliquity and precession phases of benthic δ13C but did result in a ∼50% decrease in the obliquity power of middle deep Atlantic δ13C at 0.6 Ma.