North Atlantic surface ocean warming and salinization in response to middle Eocene greenhouse warming.
North Atlantic surface ocean warming and salinization in response to middle Eocene greenhouse warming.
复制标题
北大西洋表面的海洋变暖和盐化,以响应中始新世温室变暖。
DOI:
10.1126/sciadv.abq0110
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发表时间:
2023-01-25
期刊:
影响因子:
13.6
通讯作者:
中科院分区:
文献类型:
--
作者:
Quantitative reconstructions of hydrological change during ancient greenhouse warming events provide valuable insight into warmer-than-modern hydrological cycles but are limited by paleoclimate proxy uncertainties. We present sea surface temperature (SST) records and seawater oxygen isotope (δ18Osw) estimates for the Middle Eocene Climatic Optimum (MECO), using coupled carbonate clumped isotope (Δ47) and oxygen isotope (δ18Oc) data of well-preserved planktonic foraminifera from the North Atlantic Newfoundland Drifts. These indicate a transient ~3°C warming across the MECO, with absolute temperatures generally in accordance with trace element (Mg/Ca)–based SSTs but lower than biomarker-based SSTs for the same interval. We find a transient ~0.5‰ shift toward higher δ18Osw, which implies increased salinity in the North Atlantic subtropical gyre and potentially a poleward expansion of its northern boundary in response to greenhouse warming. These observations provide constraints on dynamic ocean response to warming events, which are consistent with theory and model simulations predicting an enhanced hydrological cycle under global warming. Integrated paleoclimate reconstructions reveal the dynamic response of the North Atlantic Ocean to ancient greenhouse warming.
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