Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1
Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1
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Heinrich Stadial 1期间赤道东太平洋经向海温梯度接近崩溃
DOI：
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Kienast
中科院分区：
文献类型：
--
作者：
S. Kienast;T. Friedrich;N. Dubois;P. Hill;A. Timmermann;A. Mix;M. Kienast
[1]利用从赤道锋区（~0.01°N，ME 0005 - 24 JC）到冷舌区（~3.6°S，TR 163 - 31 P和V19-30）的3个冰芯，重建了赤道远东太平洋（EEP）近25,000年（25 ka）的海表温度（SST）和无机大陆输入。我们重新审视以前发表的烯酮衍生SST记录这些网站，并提出了修订的年表V19-30。无机大陆输入量化在所有三个网站的基础上230 Th-规范化通量的长寿命大陆同位素钍-232，并解释为主要是灰尘。Heinrich Stadial 1（HS 1，18-15 ka B. P.）以及高粉尘输入沿着赤道及以北的出口生产高峰。这些发现证实了HS 1的地球系统模型实验，模拟加强东北信风在EEP，更强的赤道上升流，和表面冷却。此外，HS 1期间热带辐合带（ITCZ）的相关南移也表明典型沙尘源区的干燥条件。
[1] Sea surface temperatures (SST) and inorganic continental input over the last 25,000 years (25 ka) are reconstructed in the far eastern equatorial Pacific (EEP) based on three cores stretching from the equatorial front (~0.01°N, ME0005-24JC) into the cold tongue region (~3.6°S; TR163-31P and V19-30). We revisit previously published alkenone-derived SST records for these sites and present a revised chronology for V19-30. Inorganic continental input is quantified at all three sites based on 230Th-normalized fluxes of the long-lived continental isotope thorium-232 and interpreted to be largely dust. Our data show a very weak meridional (cross-equatorial) SST gradient during Heinrich Stadial 1 (HS1, 18–15 ka B.P.) and high dust input along with peak export production at and north of the equator. These findings are corroborated by an Earth system model experiment for HS1 that simulates intensified northeasterly trade winds in the EEP, stronger equatorial upwelling, and surface cooling. Furthermore, the related southward shift of the Intertropical Convergence Zone (ITCZ) during HS1 is also indicative of drier conditions in the typical source regions for dust.
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影响因子：
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作者：
B. Schneider;G. Leduc;W. Park
通讯作者：
B. Schneider;G. Leduc;W. Park
东南太平洋表层风沉积物的分布和来源
影响因子：
2.9
作者：
Saukel;J. B. W;Tiedemann;C. Vogt
通讯作者：
C. Vogt
DOI：
10.1016/j.dsr2.2010.08.005
发表时间：
2011-02-01
影响因子：
3
作者：
Brzezinski, Mark A.;Baines, Stephen B.;Twining, Benjamin S.
通讯作者：
Twining, Benjamin S.
DOI：
10.1016/j.dsr.2013.04.003
发表时间：
2013-08
期刊：
--
影响因子：
--
作者：
N. Mitchell;J. Huthnance
通讯作者：
N. Mitchell;J. Huthnance