Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11
Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11
复制标题
海洋同位素第11阶段大西洋翻转环流和厄加勒斯泄漏对东南大西洋上层海洋水文学的影响
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Pancost
中科院分区：
文献类型：
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作者：
A. Dickson;M. Leng;M. Maslin;H. Sloane;J. Green;J. Bendle;E. McClymont;R. Pancost
海洋同位素阶段（MIS）11间冰期的气候动力学可以提供有关气候系统将如何演变的低振幅轨道强迫的条件下，也发现在晚全新世。本文介绍了东南大西洋钻探计划1085站点的新的稳定同位素和烯酮数据，提供了间冰期气候演变以及大西洋纬向翻转环流（MOC）和Agulhas泄漏对区域上层海洋水文的影响的详细信息。这些数据表明，尽管在MIS 11期间，温暖的表层海洋条件维持在接近全新世的水平达40，000年，但由居住在更深处的浮游有孔虫物种记录的次表层温度和盐度仅维持在7000-8000年的最高值。地表水温度和盐度数据表明，温暖，咸沃茨到东南大西洋的洋际交换直接关系到MOC的活动在研究期间的变化。具体而言，在翻转环流减弱期间的短暂区域变暖事件可能已被印度洋沃茨的持续洋间交换放大，这些海水使MOC准备好突然进入一个活跃的运行模式。相反，在MIS 11间冰期最佳结束时，海洋间交换的峰值可能反映了表层沃茨的信风强迫的增强，这些海水出口到北大西洋可能有助于MIS 11至10冰期初期重新形成冰盖。
Climate dynamics during the marine isotope stage (MIS) 11 interglacial may provide information about how the climate system will evolve under the conditions of low-amplitude orbital forcing that are also found during the late Holocene. New stable isotope and alkenone data are presented from southeast Atlantic Ocean Drilling Program Site 1085, providing detailed information on interglacial climate evolution and the impacts of Atlantic meridional overturning circulation (MOC) and Agulhas leakage on the regional upper ocean hydrography. The data suggest that although warm surface ocean conditions were maintained at approximate Holocene levels for 40,000 years during MIS 11, subsurface temperature and salinity recorded by deeper-dwelling planktonic foraminifera species were maintained at their highest values for only 7000–8000 years. Surface water temperature and salinity data suggest that the interocean exchange of warm, salty waters into the southeast Atlantic Ocean was directly related to changes in the activity of the MOC during the study interval. Specifically, transient regional warming events during periods of weakened overturning circulation may have been amplified by the continuous interocean exchange of warm, salty Indian Ocean waters that primed the MOC for abrupt resumptions into a vigorous mode of operation. Conversely, a peak in interocean exchange at the end of the MIS 11 interglacial optimum may reflect enhanced trade wind forcing of surface waters whose export to the North Atlantic Ocean could have contributed to renewed ice sheet buildup during the MIS 11 to 10 glacial inception.
影响因子：
64.8
作者：
Biastoch, A.;Boening, C. W.;Lutjeharms, J. R. E.
通讯作者：
Lutjeharms, J. R. E.