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Phase-Shift Between Surface Ocean
Warming, Evaporation and Changes
of Continental Ice Volume During
Termination I Observed at Tropical Ocean
Sediment Cores
Anton Eisenhauer, Christian Horn, Dirk N
rnberg, Thomas Blanz
and Dieter Garbe-Sch
Abstract The hypothesis that the tropical oceans lead the global warming at the
Termination I and II by
3,000 years (Visser et al. 2003 ) whereas
melting of the northern continental ice masses is lacking behind challenges the
Milankovitch theory of climate change and emphasizes the role of the tropics for
global climate change. Although the simultaneous multi-proxy approach of
planktonic foraminiferal Mg/Ca,
2,000 to
18 O and
44/40 Ca from tropical sediment core
SO-164-03-4 (16
N; 72
W; 2,744 m) from the Caribbean tend to
rm the observation by Visser et al. ( 2003 ) we interpret the shift between
Mg/Ca and
18 O in core SO-164-03-4 to be due to local changes in sea-surface salinity
(SSS) variations triggered by glacial/interglacial related shifts of the Inter-tropical
Convergence Zone (ITCZ).
Keywords Sea-surface temperature
Sea-surface salinity
Termination I
Foraminiferal geochemistry
Ca isotopes
1 Introduction
We investigated the important question in paleo-climatology to which degree the
high northern latitudes or the tropics are triggering glacial/interglacial climate
change. In more detail the proposed study is intended to examine the timing and
phasing of ocean warming around Termination I verifying the hypothesis, put
forward by Visser et al. in 2003 . The inferences of Visser et al. ( 2003 ) are based on
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