A major and long-term Pliocene intensification of the Mediterranean Outflow, 3.5-3.3 Ma ago

A major and long-term Pliocene intensification of the Mediterranean Outflow, 3.5-3.3 Ma ago
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3·5-3·3Ma前上新世地中海外流的一次重大且长期的强化

DOI:
10.1130/g30058a.1
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发表时间:
2009
期刊:
影响因子:
5.8
通讯作者:
Weinelt M.
Weinelt M.
中科院分区:
地球科学1区
文献类型:
--
作者:
Khèlifi N;Sarnthein M;Andersen N;Blanz T;Frank M;Garbe-Schönberg D;Haley B.A;Stumpf R;Weinelt M.

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深海钻探工程(DSDP)548号站点(东大西洋大陆边缘,靠近爱尔兰,水深1250 m)获得了3.7-3.0 Ma前底栖生物δ 18 O、Mg/Ca基温度和底沃茨盐度变化的千年尺度连续记录。高ε Nd值(−10.7至−9)表明,该站点在整个上新世中期监测了地中海流出水(MOW)的变化。大洋钻探项目(ODP)站点978(阿尔沃兰海,1930米水深)的底层水的变化提供了一个补充记录MOW组成附近的西地中海来源。这两个地点都显示出从3.5到3.3 Ma前,底层水盐度持续上升0.7-1.4 psu,密度上升约1 kg m− 3,这与548地点底层水温上升约3 °C相匹配。这一事件表明,强烈增强的深水对流在地中海和MOW流量的相关增加,作为在地中海源区的主要干旱化的结果开始。与模式建议相一致,增强的MOW流可能加强了北大西洋上层深水的形成。
Largely continuous millennial-scale records of benthic δ18O, Mg/Ca-based temperature, and salinity variations in bottom waters were obtained from Deep Sea Drilling Project (DSDP) Site 548 (East Atlantic continental margin near Ireland, 1250 m water depth) for the period 3.7–3.0 Ma ago. High εNdvalues of −10.7 to −9 show that this site monitored changes in Mediterranean Outflow Water (MOW) throughout the mid-Pliocene. Bottom water variability at Ocean Drilling Progam (ODP) Site 978 (Alboran Sea, 1930 m water depth) provides a complementary record of MOW composition near its West Mediterranean source. Both sites show a singular and persistent rise in bottom water salinities by 0.7–1.4 psu, and in densities by ~1 kg m−3from 3.5 to 3.3 Ma ago, which is matched by an ~3 °C increase in bottom water temperature at Site 548. This event suggests the onset of strongly enhanced deep-water convection in the Mediterranean Sea and a related increase in MOW flow as a result of major aridification in the Mediterranean source region. In harmony with model suggestions, the enhanced MOW flow has possibly intensified Upper North Atlantic Deep Water formation.
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