Evolution of Sea Surface Temperature in the Southern Mid‐latitudes From Late Oligocene Through Early Miocene
Evolution of Sea Surface Temperature in the Southern Mid‐latitudes From Late Oligocene Through Early Miocene
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渐新世晚期到中新世早期南部中纬度地区海面温度的演变
DOI：
10.1029/2020pa004199
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发表时间：
2021
影响因子：
3.5
通讯作者：
H. Stoll
中科院分区：
文献类型：
--
作者：
J. Guitián;H. Stoll
南极冰量的巨大变化是渐新世中期至晚期以及中新世第一个百万年气候演变的特征。然而，海表温度（SST）的演变在这一时期仍然受到很大的限制，因为只有少数记录，从对比代理。在这项研究中，我们提出了一个长期的烯酮衍生SST记录从沉积物钻探的海洋钻探计划（ODP）在网站1168在西塔斯马尼亚海跨越29.8 Ma至16.7 Ma。SST记录突出表明，与渐新世中期冰期结束有关的渐新世晚期的长期变暖也可以在南半球的中高纬度地区被识别出来。24.6 ~ 22 Ma期间的平均温度较高（25.5°C）;然后平均温度下降1°C ~ 2°C，进入中新世，并在20.1 Ma时稳定下来。重建的温度在温暖的晚渐新世沃茨中变化很大，在早中新世至中中新世更稳定，略冷。我们确认，这种温度趋势是不是一个人工制品的纬度漂移的网站，作为温度异常相对于现代水温在古位置证实了SST趋势的渐新世。这是第一个由烯酮衍生的连续记录，重现了以前从底栖δ 18 O解释的长期渐新世气候趋势，该趋势记录了从渐新世中期冰期到最晚渐新世的变暖和/或冰量减少。
Large Antarctic ice volume changes characterized the middle to Late Oligocene and the first million years of climate evolution during the Miocene. However, the sea surface temperature (SST) evolution over this period remains poorly constrained, as only a few records from contrasting proxies are available. In this study, we present a long‐term alkenone‐derived SST record from sediments drilled by the Ocean Drilling Program (ODP) at Site 1168 in the west Tasmanian Sea spanning 29.8 Ma to 16.7 Ma. The SST record highlight that the long‐term warming in the Late Oligocene linked to the end of the Middle Oligocene Glacial Interval can be recognized also at mid‐to‐high latitudes of the Southern Hemisphere. Warmer average temperatures (25.5°C) characterize the period from 24.6 to 22 Ma; average temperatures then decrease by 1°C–2°C into the Miocene and stabilize by 20.1 Ma. The reconstructed temperatures are highly variable in the warm Late Oligocene waters, and more stable and slightly colder in the Early to Middle Miocene. We confirm that this temperature trend is not an artifact of the latitudinal drift of the site, as the temperature anomaly relative to the modern water temperature at the paleolocation confirms the SST trends of the Oligocene. This is the first alkenone‐derived continuous record to reproduce the long‐term Oligocene climate trend previously interpreted from the benthic δ18O, which recorded a warming and/or reduction in ice volume from the Middle Oligocene Glacial Interval through the latest Oligocene.
影响因子：
3
作者：
Yinsui Zheng;P. Heng;M. Conte;R. Vachula;Yongsong Huang
通讯作者：
Yinsui Zheng;P. Heng;M. Conte;R. Vachula;Yongsong Huang