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The Southern Westerlies During
the Holocene: Paleoenvironmental
Reconstructions from Chilean Lake,
Fjord, and Ocean Margin Sediments
Combined with Climate Modeling
Frank Lamy, Matthias Prange, Helge W. Arz, Vidya Varma,
Jerome Kaiser, Rolf Kilian, Jens Hefter, Albert Benthien
and Gesine Mollenhauer
Abstract This project aimed at investigating centennial to millennial-scale changes
of the strength and position of the southern westerly wind belt (SWW) using multi-
proxy paleoprecipitation and paleoceanographic records combined with transient
model runs. The proxy data records reveal a distinct latitudinal anti-phasing of wind
changes between the core and northern margin of the SWW over the Holocene.
During the early Holocene, the SWW core was enhanced and the northern margin
was reduced, whereas the opposite pattern is observed in the late Holocene. These
Holocene changes resemble modern seasonal wind belt variations and can be best
explained by varying sea-surface temperature
c.
Transient modeling experiments from the mid- to late Holocene are not yet con-
sistent with these proxy results. However, a good data-model agreement exists
when investigating the potential impact of solar variability on the SWW at cen-
tennial time-scales during the latest Holocene with periods of lower (higher) solar
activity causing equatorward (southward) shifts of the SWW.
fields in the eastern South Paci
F. Lamy (
&
)
J. Hefter
A. Benthien
G. Mollenhauer
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research,
Bremerhaven, Germany
e-mail: frank.lamy@awi.de
M. Prange
V. Varma
MARUM
Center for Marine Environmental Sciences and Faculty of Geosciences,
University of Bremen, Bremen, Germany
H.W. Arz
—
J. Kaiser
Leibniz Institute for Baltic Sea Research Warnemünde, Rostock-Warnemünde, Germany
R. Kilian
Department of Geology, Faculty of Geography/Geosciences, University of Trier,
Trier, Germany
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