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Persistent Link Between Caribbean Precipitation and Atlantic Ocean Circulation During the Last Glacial Revealed by a Speleothem Record From Puerto Rico
Paleoceanography and Paleoclimatology ( IF 3.2 ) Pub Date : 2020-11-03 , DOI: 10.1029/2020pa003944
Sophie F. Warken 1, 2, 3 , Rolf Vieten 4 , Amos Winter 4, 5 , Christoph Spötl 6 , Thomas E. Miller 7 , Klaus P. Jochum 8 , Andrea Schröder‐Ritzrau 2 , Augusto Mangini 2 , Denis Scholz 1
Affiliation  

The sensitivity of tropical Atlantic precipitation patterns to the mean position of the Intertropical Convergence Zone (ITCZ) at different time scales is well‐known. However, recent research suggests a more complex behavior of the northern hemispheric tropical rain belt related to the ITCZ in the western tropical Atlantic. Here we present a precisely dated speleothem multi‐proxy record from a well‐monitored cave in Puerto Rico, covering the period between 46.2 and 15.3 ka. The stable isotope and trace element records document a pronounced response of regional rainfall to abrupt climatic excursions in the North Atlantic across the Last Glacial such as Heinrich stadials and Dansgaard/Oeschger events. The annual to multidecadal resolution of the proxy time series allows substructural investigations of the recorded events. Spectral analysis suggests that multidecadal to centennial variability persisted in the regional hydroclimate mainly during interstadial conditions but also during the Last Glacial Maximum. In particular, we observe a strong agreement between the speleothem proxy data and the strength of the Atlantic meridional overturning circulation, supporting a persistent link of oceanic forcing to regional precipitation. Comparison to other paleo‐precipitation records enables the reconstruction of past changes in position, strength, and extent of the ITCZ in the western tropical Atlantic in response to millennial‐ and orbital‐scale global climate change.

中文翻译:

波多黎各Speleothem记录揭示了最后一次冰川期间加勒比海降水与大西洋环流之间的持久联系

在不同的时间尺度上,热带大西洋降水模式对热带辐合带(ITCZ)平均位置的敏感性是众所周知的。但是,最近的研究表明,北半球热带雨带的行为与西部热带大西洋的ITCZ有关。在这里,我们从波多黎各的一个受良好监测的洞穴中呈现了一个精确日期的蛇麻草多代理记录,涵盖了46.2至15.3 ka之间的时间段。稳定的同位素和痕量元素记录记录了北冰洋在最后一次冰川期间对北大西洋突然气候变化的明显反应,例如海因里希(Heinrich)滩涂和Dansgaard / Oeschger事件。代理时间序列的年度至数十年分辨率可以对记录的事件进行子结构调查。光谱分析表明,区域性水文气候在年代际条件下持续数十年到百年的变化,但在最后一次冰期最大值期间也是如此。特别是,我们观察到蛇麻草代用数据与大西洋经向翻转环流的强度之间有很强的一致性,支持了海洋强迫与区域降水的持久联系。通过与其他古降水记录进行比较,可以重建热带热带西部ITCZ的位置,强度和范围过去的变化,以响应千禧年和轨道尺度的全球气候变化。我们观察到蛇麻草代用资料与大西洋经向翻转环流的强度之间有很强的一致性,支持了海洋强迫与区域降水的持久联系。通过与其他古降水记录进行比较,可以重建热带热带西部ITCZ的位置,强度和范围过去的变化,以响应千禧年和轨道尺度的全球气候变化。我们观察到蛇麻草代用资料与大西洋经向翻转环流的强度之间有很强的一致性,支持了海洋强迫与区域降水的持久联系。通过与其他古降水记录进行比较,可以重建热带热带西部ITCZ的位置,强度和范围过去的变化,以响应千禧年和轨道尺度的全球气候变化。
更新日期:2020-11-21
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