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首页> 外文期刊>Paleoceanography >Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11
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Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11

机译：海洋同位素第11期期间大西洋翻转环流和Agulhas泄漏对东南大西洋上层海洋水文学的影响

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摘要

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.
机译：海洋同位素阶段（MIS）11间冰期的气候动力学可能提供有关在全新世晚期也发现的低振幅轨道强迫条件下气候系统如何演化的信息。来自东南大西洋钻探计划站点1085的新的稳定同位素和烯酮数据提供了冰川间气候演变以及大西洋经向翻转环流（MOC）和Agulhas泄漏对区域上层海洋水文学的影响的详细信息。数据表明，尽管在MIS 11期间，温暖的表层海洋条件在40,000年来一直保持全新世水平，但深层浮游有孔虫物种记录的地下温度和盐度仅在7000-8000年间保持在最高值。地表水温度和盐度数据表明，在研究间隔期间，向东南大西洋的海水，咸水之间的海洋交换与MOC活性的变化直接相关。具体来说，在倾覆环流减弱的时期内，区域性暂时性变暖事件可能已经因海洋之间不断交换温暖，咸味的印度洋海水而加剧，这使MOC突然恢复了正常运行状态。相反，在MIS 11最佳冰期末结束时，海洋间交换的高峰可能反映了地表水贸易风的强迫，其向北大西洋的出口可能有助于在MIS 11至10冰川初期重新形成了冰盖。

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