Bahamian speleothem reveals temperature decrease associated with Heinrich stadials
Bahamian speleothem reveals temperature decrease associated with Heinrich stadials
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DOI：
10.1016/j.epsl.2015.08.035
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发表时间：
2015-11-15
影响因子：
5.3
通讯作者：
Kakuk, Brian
中科院分区：
文献类型：
--
作者：
Arienzo, Monica M.;Swart, Peter K.;Kakuk, Brian
温度重建海因里希stadials 1-3从一个绝对定年的speleothem在巴哈马群岛的阿巴科岛，以了解这些间隔在亚热带大西洋的气候变化的性质。石笋碳酸盐记录，由U-Th测年技术，包括较高的三角洲O-18和三角洲C-13值内海因里希stadials 1，2，3，然后迅速下降，在年底的stadials。为了帮助这些结果的解释，流体包裹体的δ O-18与海因里希stadials进行了分析。这些测量，允许区分温度和沉淀的Δ O-18的相对影响，证明流体包裹体的Δ O-18的变化很小，表明与Heinrich stadials 1-3相关的洞穴碳酸盐的Δ O-18值的变化主要是由平均类似于4摄氏度的温度下降驱动的，而不是降雨量的Δ O-18的变化（因此降雨量）。这些发现支持了以前在北大西洋的工作，并与气候响应大西洋纬向翻转环流减弱是一致的。(C)201 5 Elsevier B. V.保留所有权利。
Temperature reconstructions across Heinrich stadials 1-3 are presented from an absolute-dated speleothem from Abaco Island in the Bahamas to understand the nature of climate change across these intervals in the subtropical Atlantic. The stalagmite carbonate record, dated by the U-Th geochronometry technique, includes higher delta O-18 and delta C-13 values within Heinrich stadials 1, 2, and 3 followed by rapid declines at the end of the stadials. To aid in the interpretation of these results, the delta O-18 of fluid inclusions associated with the Heinrich stadials were also analyzed. These measurements, which allowed for the relative influence of temperature and delta O-18 of precipitation to be distinguished, demonstrate minimal changes in the delta O-18 of fluid inclusions, suggesting that change's in the delta O-18 values of the speleothem carbonate associated with Heinrich stadials 1-3 are principally driven by an average similar to 4 degrees C temperature decrease, rather than a change in the delta O-18 of the rainfall (hence rainfall amount). These findings support previous work in the North Atlantic and are consistent with the climate response to a weakening of the Atlantic meridional overturning circulation. (C) 201 5 Elsevier B.V. All rights reserved.