Western Caribbean sea surface temperatures during the late Quaternary
Western Caribbean sea surface temperatures during the late Quaternary
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DOI：
10.1029/2005gc000957
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发表时间：
2006-02
期刊：
影响因子：
3.7
通讯作者：
M. Schmidt;M. Vautravers;H. Spero
中科院分区：
文献类型：
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作者：
M. Schmidt;M. Vautravers;H. Spero
哥伦比亚盆地岩芯ODP 999 A中的浮游有孔虫Globigerinoides ruber中的Mg/Ca比值表明，在最近三次冰期最高峰期间，加勒比海表面温度比现在低2.1至2.7°C。相比之下，动物区系得出的SST（SIMMAX方法）显示，在过去的36万年里，加勒比地区8月的SST变化<2°C，而2月的SST变化在21.0°C和26.5°C之间。Mg/Ca-SST记录的变化包含了23 kyr的强烈周期性，这表明Mg/Ca-SST记录反映了暖季加权SST平均值，而不是年平均SST。结合几个溶解指数，我们确定在我们的记录减少碳酸盐保存的短暂时期，并显示MIS 11脱颖而出，在过去的460 kyr在加勒比海最密集的溶解周期。比较加勒比海SST变化与过去36万年西太平洋热带SST变化的类似估计，揭示了东西热带SST梯度的变化与冰期-间冰期气候变化是同时期的，与冰期ITCZ的南移和类似厄尔尼诺的热带环流模式一致。
Mg/Ca ratios in the planktonic foraminifera Globigerinoides ruber from Colombian Basin core ODP 999A suggest that Caribbean sea surface temperatures (SSTs) were from 2.1 to 2.7°C colder than the present during the last three glacial maximums. In comparison, faunal derived SSTs (SIMMAX method) show that August SSTs in the Caribbean varied <2°C over the past 360 kyr, whereas February SSTs varied between 21.0°C and 26.5°C. Changes in the Mg/Ca‐SST record contain a strong 23 kyr periodicity, suggesting the Mg/Ca‐SST record reflects a warm season weighted SST average rather than an annual mean SST. Combining several dissolution indices, we identify brief periods of decreased carbonate preservation in our record and show that MIS 11 stands out as the most intensive dissolution cycle in the Caribbean over the last 460 kyr. Comparison of Caribbean SST change with a similar estimate of tropical SST variability in the western Pacific over the past 360 kyr reveals shifts in the east‐west tropical SST gradient that are coeval with glacial‐interglacial climate change and consistent both with a southward migration of the glacial ITCZ and with a glacial El Niño‐like mode of tropical circulation.