Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial.
Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial.
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DOI：
10.1038/s41467-017-00577-6
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发表时间：
2017-09-12
影响因子：
16.6
通讯作者：
Cooper A
中科院分区：
文献类型：
--
作者：
Turney CSM;Jones RT;Phipps SJ;Thomas Z;Hogg A;Kershaw AP;Fogwill CJ;Palmer J;Bronk Ramsey C;Adolphi F;Muscheler R;Hughen KA;Staff RA;Grosvenor M;Golledge NR;Rasmussen SO;Hutchinson DK;Haberle S;Lorrey A;Boswijk G;Cooper A
格陵兰和南极在末次冰期（115，000年至11，650年前）的温度对比被认为是由北大西洋和南极深层水形成速度的不平衡（“两极跷跷板”）驱动的。在这里，我们利用从新西兰贝壳杉（Agathis australis）获得的bidecadally解决14 C数据集进行高精度对齐的关键气候数据集跨越冰山漂流碎片事件海因里希3和格陵兰岛Interstadial（GI）5.1在北大西洋（约30,400至28,400年前）。我们没有观察到贝壳杉和大西洋海洋沉积物14 C数据集之间的分歧，这意味着有限的深水形成的变化。然而，南大洋（南极部门）的冰山漂流碎片事件似乎已经发生同步GI-5.1变暖和减少降水在赤道太平洋和大西洋西部。瞬态融水模拟的合奏表明，舌tic-sourced盐度异常可以产生气候变化，通过大气Rossby波列传播到全球。测试过去气候变化机制的一个挑战是古气候记录的精确相关性。在这里，通过气候建模和陆地，冰和海洋14 C和10 Be记录的对齐，作者表明南大洋淡水冲洗可以引发全球变化。
Contrasting Greenland and Antarctic temperatures during the last glacial period (115,000 to 11,650 years ago) are thought to have been driven by imbalances in the rates of formation of North Atlantic and Antarctic Deep Water (the ‘bipolar seesaw’). Here we exploit a bidecadally resolved 14C data set obtained from New Zealand kauri (Agathis australis) to undertake high-precision alignment of key climate data sets spanning iceberg-rafted debris event Heinrich 3 and Greenland Interstadial (GI) 5.1 in the North Atlantic (~30,400 to 28,400 years ago). We observe no divergence between the kauri and Atlantic marine sediment 14C data sets, implying limited changes in deep water formation. However, a Southern Ocean (Atlantic-sector) iceberg rafted debris event appears to have occurred synchronously with GI-5.1 warming and decreased precipitation over the western equatorial Pacific and Atlantic. An ensemble of transient meltwater simulations shows that Antarctic-sourced salinity anomalies can generate climate changes that are propagated globally via an atmospheric Rossby wave train. A challenge for testing mechanisms of past climate change is the precise correlation of palaeoclimate records. Here, through climate modelling and the alignment of terrestrial, ice and marine 14C and 10Be records, the authors show that Southern Ocean freshwater hosing can trigger global change.
影响因子：
16.6
作者：
Turney CSM;Jones RT;Phipps SJ;Thomas Z;Hogg A;Kershaw AP;Fogwill CJ;Palmer J;Bronk Ramsey C;Adolphi F;Muscheler R;Hughen KA;Staff RA;Grosvenor M;Golledge NR;Rasmussen SO;Hutchinson DK;Haberle S;Lorrey A;Boswijk G;Cooper A
通讯作者：
Cooper A