Late Quaternary variability of Mediterranean Outflow Water from radiogenic Nd and Pb isotopes
Late Quaternary variability of Mediterranean Outflow Water from radiogenic Nd and Pb isotopes
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放射性 Nd 和 Pb 同位素对地中海流出水的晚第四纪变化
DOI：
10.1016/j.quascirev.2010.06.021
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发表时间：
2010
影响因子：
4
通讯作者：
B. Haley
中科院分区：
文献类型：
--
作者：
R. Stumpf;M. Frank;J. Schönfeld;B. Haley
地中海外流水（MOW）的特点是温度和盐度高于其他环境水体。MOW分布在北大西洋东部500至1500米的水深处，是北大西洋大西洋经向翻转环流的盐度来源。我们使用高分辨率的Nd和Pb同位素记录的过去的环境海水中获得的自生铁锰涂层的沉积物在三个重力岩心在577，1745和1974米水深的加迪斯湾和沿着葡萄牙边缘补充的选择表面沉积物，以重建MOW在过去的23 000年的程度和途径。从所有水深的表面和downcore钕同位素数据表现出只有一个非常小的变化接近今天的MOW组成，但不反映今天的Nd同位素分层的水柱确定从附近的开放海洋水文站。相比之下，铅同位素记录显示出显着的和系统的变化，这提供了证据，一个显着不同的模式之间的MOW路径20 000年和12 000年前相比，随后的一段时间。
Mediterranean Outflow Water (MOW) is characterised by higher temperatures and salinities than other ambient water masses. MOW spreads at water depths between 500 and 1500 m in the eastern North Atlantic and has been a source of salinity for the Atlantic Meridional Overturning Circulation in the North Atlantic. We used high-resolution Nd and Pb isotope records of past ambient seawater obtained from authigenic ferromanganese coatings of sediments in three gravity cores at 577, 1745 and 1974 m water depth in the Gulf of Cadiz and along the Portuguese margin complemented by a selection of surface sediments to reconstruct the extent and pathways of MOW over the past 23 000 years. The surface and downcore Nd isotope data from all water depths exhibit only a very small variability close to the present day composition of MOW but do not reflect the present day Nd isotopic stratification of the water column as determined from a nearby open ocean hydrographic station. In contrast, the Pb isotope records show significant and systematic variations, which provide evidence for a significantly different pattern of the MOW pathways between 20 000 and 12 000 years ago compared with the subsequent period of time.
3·5-3·3Ma前上新世地中海外流的一次重大且长期的强化
影响因子：
5.8
作者：
Khèlifi N;Sarnthein M;Andersen N;Blanz T;Frank M;Garbe-Schönberg D;Haley B.A;Stumpf R;Weinelt M.
通讯作者：
Weinelt M.
影响因子：
5.8
作者：
Foster, Gavin L.;Vance, Derek;Prytulak, Julie
通讯作者：
Prytulak, Julie