Sea surface temperatures in the equatorial and South Atlantic Ocean during the Last Glacial Maximum (23–19 ka)
Sea surface temperatures in the equatorial and South Atlantic Ocean during the Last Glacial Maximum (23–19 ka)
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末次盛冰期（23-19ka）期间赤道和南大西洋的海面温度
DOI：
10.1029/2003pa000902
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
G. Wefer
中科院分区：
文献类型：
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作者：
H. Niebler;H. Arz;B. Donner;S. Mulitza;J. Pätzold;G. Wefer
利用热带和亚热带南大西洋（10°N-37°S） 70个沉积物岩心的浮游有孔虫组合，利用改进版的Imbrie-Kipp传递函数法（IKTF）估计末次盛冰期的年平均海面温度（SSTs）和季节性，该方法考虑了稀有但对温度敏感的物种的丰度。与CLIMAP项目成员[1981]相比，重建的海温表明整个热带/亚热带南大西洋的冰川海温更冷，纳米比亚附近的上升流区降温最强（7-10°C），西亚热带环流降温最小（1-2°C）。在西大西洋，我们的数据支持来自其他代理的近期温度估计。在东大西洋的上升流区，我们的数据与烯酮的海温重建相冲突，这可能是由于产生烯酮的藻类的环境偏好或由于异常高丰度的厚皮奈菌（sininistral）而低估了有孔虫的海温。
[1] We used planktic foraminiferal assemblages in 70 sediment cores from the tropical and subtropical South Atlantic Ocean (10°N-37°S) to estimate annual mean sea surface temperatures (SSTs) and seasonality for the Last Glacial Maximum with a modified version of the Imbrie-Kipp transfer function method (IKTF) that takes into account the abundance of rare but temperature sensitive species. In contrast to CLIMAP Project Members [1981], the reconstructed SSTs indicate cooler glacial SSTs in the entire tropical/subtropical South Atlantic with strongest cooling in the upwelling region off Namibia (7-10°C) and smallest cooling (1-2°C) in the western subtropical gyre. In the western Atlantic, our data support recent temperature estimates from other proxies. In the upwelling regions in the eastern Atlantic, our data conflict with SST reconstructions from alkenones, which may be due to an environmental preference of the alkenone-producing algae or to an underestimation of foraminiferal SSTs due to anomalous high abundances of N. pachyderma (sinistral).