Enhanced climate instability in the North Atlantic and southern Europe during the Last Interglacial.
Enhanced climate instability in the North Atlantic and southern Europe during the Last Interglacial.
复制标题
DOI：
10.1038/s41467-018-06683-3
复制
发表时间：
2018-10-12
影响因子：
16.6
通讯作者：
Zanchetta G
中科院分区：
文献类型：
--
作者：
Tzedakis PC;Drysdale RN;Margari V;Skinner LC;Menviel L;Rhodes RH;Taschetto AS;Hodell DA;Crowhurst SJ;Hellstrom JC;Fallick AE;Grimalt JO;McManus JF;Martrat B;Mokeddem Z;Parrenin F;Regattieri E;Roe K;Zanchetta G
末次间冰期（LIG）期间千年/百年尺度气候不稳定的程度和性质仍然存在相当大的模糊性。在这里，我们分析海洋和陆地代理从深海沉积物序列的葡萄牙边缘和联合收割机的结果与密集的意大利speleothem记录和气候模型实验。气候变率的最强表达发生在过渡到和出LIG。我们的记录还记录了南欧一系列数百年的间冰期干旱事件，与北大西洋冷水团的扩张相一致。这些变化的空间和时间指纹表明，海洋表面环流的重组，与大西洋纬向翻转环流（AMOC）的低强度中断一致。这种LIG变化的幅度大于全新世记录中观察到的。由于过度温暖，格陵兰岛的冰融化和径流可能导致AMOC减弱，并增加了整个LIG的气候不稳定性。必须为相对温暖条件下的自然气候变异性确定一个基线。在这里，我们表明，在北大西洋和南欧的最后一次间冰期的特点是增强气候不稳定性相对于前工业全新世。
Considerable ambiguity remains over the extent and nature of millennial/centennial-scale climate instability during the Last Interglacial (LIG). Here we analyse marine and terrestrial proxies from a deep-sea sediment sequence on the Portuguese Margin and combine results with an intensively dated Italian speleothem record and climate-model experiments. The strongest expression of climate variability occurred during the transitions into and out of the LIG. Our records also document a series of multi-centennial intra-interglacial arid events in southern Europe, coherent with cold water-mass expansions in the North Atlantic. The spatial and temporal fingerprints of these changes indicate a reorganization of ocean surface circulation, consistent with low-intensity disruptions of the Atlantic meridional overturning circulation (AMOC). The amplitude of this LIG variability is greater than that observed in Holocene records. Episodic Greenland ice melt and runoff as a result of excess warmth may have contributed to AMOC weakening and increased climate instability throughout the LIG. It is important to establish a baseline for natural climate variability under relatively warm conditions. Here we show that the Last Interglacial in the North Atlantic and southern Europe was characterized by enhanced climate instability relative to the pre-industrial Holocene.
登录
查看更多内容
DOI：
10.1016/s0031-0182(98)00205-3
发表时间：
1999-06-01
影响因子：
3
作者：
Chmura, GL;Smirnov, A;Campbell, ID
通讯作者：
Campbell, ID
影响因子：
--
作者：
Anand, P;Elderfield, H;Conte, MH
通讯作者：
Conte, MH
影响因子：
18.3
作者：
Boening, Claus W.;Behrens, Erik;Bamber, Jonathan L.
通讯作者：
Bamber, Jonathan L.
影响因子：
56.9
作者：
Drysdale, R. N.;Hellstrom, J. C.;Isola, I.
通讯作者：
Isola, I.
影响因子：
64.8
作者：
Caesar, L.;Rahmstorf, S.;Saba, V.
通讯作者：
Saba, V.