Millennial-scale climate variability during the last 12.5 ka recorded in a Caribbean speleothem
Millennial-scale climate variability during the last 12.5 ka recorded in a Caribbean speleothem
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DOI：
10.1016/j.epsl.2012.11.019
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发表时间：
2013-01-01
影响因子：
5.3
通讯作者：
Mangini, Augusto
中科院分区：
文献类型：
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作者：
Fensterer, Claudia;Scholz, Denis;Mangini, Augusto
我们根据古巴西部的两块石笋提供了过去 12.5 ka 的洞穴植物稳定氧同位素记录。 Delta O-18 信号被解释为代表过去的降水变化。在 10 到 6 ka 之间，两个石笋都显示出从较高的 Delta O-18 值（表明较干燥的条件）到较低的 Delta O-18 值（表明较湿润的条件）的明显转变。这种转变在海地附近的浮游三角洲 O-18 记录中也可见。因此，在轨道时间尺度上，加勒比降水的 Delta O-18 值与加勒比地表水的氧同位素组成非常相似。在千年时间尺度上，洞穴 Delta O-18 记录显示与西非附近的北大西洋海面温度 (SST) 记录高度相关，并且与邦德事件相似。北大西洋海温较低的时期对应于加勒比地区降水量的减少，反之亦然。与加勒比海的潜在遥相关可能反映了热带辐合带的位置，因为热带辐合带的位置进一步向南导致加勒比海北部的降水减少。 (C) 2012 Elsevier B.V. 保留所有权利。
We present a speleothem stable oxygen isotope record for the last 12.5 ka based on two stalagmites from western Cuba. The delta O-18 signal is interpreted to represent past precipitation variability.Both stalagmites show a pronounced transition from higher delta O-18 values (indicating drier conditions) to more negative delta O-18 values (suggesting wetter conditions) between 10 and 6 ka. This transition is also visible in a planktonic delta O-18 record off Haiti. On orbital timescales, the delta O-18 value of Caribbean precipitation, thus, strongly resembles the oxygen isotope composition of Caribbean surface water.On millenial timescales, the speleothem delta O-18 record shows a high correlation to a North Atlantic sea surface temperature (SST) record off West Africa as well as a similarity with the Bond events. Periods of lower North Atlantic SST correspond to less precipitation in the Caribbean and vice versa. The potential teleconnection to the Caribbean may reflect the position of the Intertropical Convergence Zone because a further southward position of the ITCZ leads to reduced precipitation in the northern Caribbean. (C) 2012 Elsevier B.V. All rights reserved.