Strong coupling of Asian Monsoon and Antarctic climates on sub-orbital timescales.
Strong coupling of Asian Monsoon and Antarctic climates on sub-orbital timescales.
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亚洲季风和南极气候在亚轨道时间尺度上的强耦合
DOI：
10.1038/srep32995
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发表时间：
2016-09-08
影响因子：
4.6
通讯作者：
Liu D
中科院分区：
文献类型：
--
作者：
Chen S;Wang Y;Cheng H;Edwards RL;Wang X;Kong X;Liu D
越来越多的证据表明，千年尺度的气候变率对轨道尺度的气候变化起着积极的作用，但其机制仍不清楚。永兴洞石笋δ 18 O记录反映了8.8 ~ 2.2万年前亚洲季风强度的变化。从我们的记录中去除65°N的日射信号后，δ 18 O残留物在海洋同位素阶段（MIS）3期间与亚轨道时间尺度上的南极温度变化强烈反相。此外，一旦从南极冰芯记录的冰量信号被删除，并外推回最后两个冰期-间冰期周期，我们观察到亚洲和南极气候变化之间的短期和长期事件的线性关系。这为北方和南半球气候之间的联系提供了强有力的证据，这种联系是通过大气环流的变化来运作的。我们发现，最弱的季风密切相关的最温暖的南极事件总是发生在终止。这一发现，沿着蛋白石通量记录的类似变化，表明千年尺度的事件通过与增强的上升流和增加的CO2相关的正反馈在推动冰川消退中发挥了关键作用。
There is increasing evidence that millennial-scale climate variability played an active role on orbital-scale climate changes, but the mechanism for this remains unclear. A 230Th-dated stalagmite δ18O record between 88 and 22 thousand years (ka) ago from Yongxing Cave in central China characterizes changes in Asian monsoon (AM) strength. After removing the 65°N insolation signal from our record, the δ18O residue is strongly anti-phased with Antarctic temperature variability on sub-orbital timescales during the Marine Isotope Stage (MIS) 3. Furthermore, once the ice volume signal from Antarctic ice core records were removed and extrapolated back to the last two glacial-interglacial cycles, we observe a linear relationship for both short- and long-duration events between Asian and Antarctic climate changes. This provides the robust evidence of a link between northern and southern hemisphere climates that operates through changes in atmospheric circulation. We find that the weakest monsoon closely associated with the warmest Antarctic event always occurred during the Terminations. This finding, along with similar shifts in the opal flux record, suggests that millennial-scale events play a key role in driving the deglaciation through positive feedbacks associated with enhanced upwelling and increasing CO2.
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DOI：
10.1073/pnas.0708494104
发表时间：
2007-10-30
影响因子：
11.1
作者：
Barker, Stephen;Knorr, Gregor
通讯作者：
Knorr, Gregor
影响因子：
--
作者：
Barrows, Timothy T.;Juggins, Steve;Pelejero, Carles
通讯作者：
Pelejero, Carles
影响因子：
4.3
作者：
Bazin, L.;Landais, A.;Wolff, E.
通讯作者：
Wolff, E.
影响因子：
--
作者：
Hayes, C. T.;Anderson, R. F.;Fleisher, M. Q.
通讯作者：
Fleisher, M. Q.
影响因子：
4.9
作者：
Cvijanovic, Ivana;Langen, Peter L.;Ditlevsen, Peter D.
通讯作者：
Ditlevsen, Peter D.