Universität zu Köln

Lamy, Frank ORCID: 0000-0001-5952-1765, Kilian, Rolf, Arz, Helge W., Francois, Jean-Pierre ORCID: 0000-0001-7616-0762, Kaiser, Jerome, Prange, Matthias and Steinke, Tatjana (2010). Holocene changes in the position and intensity of the southern westerly wind belt. Nat. Geosci., 3 (10). S. 695 - 700. NEW YORK: NATURE PUBLISHING GROUP. ISSN 1752-0894

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Abstract

The position and intensity of the southern westerly wind belt varies seasonally as a consequence of changes in sea surface temperature. During the austral winter, the belt expands northward and the wind intensity in the core decreases. Conversely, during the summer, the belt contracts, and the intensity within the core is strengthened. Reconstructions of the westerly winds since the last glacial maximum, however, have suggested that changes at a single site reflected shifts throughout the entire southern wind belt(1-4). Here we use sedimentological and pollen records to reconstruct precipitation patterns over the past 12,500 yr from sites along the windward side of the Andes. Precipitation at the sites, located in the present core and northern margin of the westerlies, is driven almost entirely by the wind belt(5), and can be used to reconstruct its intensity. Rather than varying coherently throughout the Holocene epoch, we find a distinct anti-phasing of wind strength between the core and northern margin over multi-millennial timescales. During the early Holocene, the core westerlies were strong whereas the northern margin westerlies were weak. We observe the opposite pattern in the late Holocene. As this variation resembles modern seasonal variability, we suggest that our observed changes in westerly wind strength can best be explained by variations in sea surface temperature in the eastern South Pacific Ocean.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lamy, Frank UNSPECIFIED orcid.org/0000-0001-5952-1765 UNSPECIFIED Kilian, Rolf UNSPECIFIED UNSPECIFIED UNSPECIFIED Arz, Helge W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Francois, Jean-Pierre UNSPECIFIED orcid.org/0000-0001-7616-0762 UNSPECIFIED Kaiser, Jerome UNSPECIFIED UNSPECIFIED UNSPECIFIED Prange, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Steinke, Tatjana UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-496044
DOI:	10.1038/NGEO959
Journal or Publication Title:	Nat. Geosci.
Volume:	3
Number:	10
Page Range:	S. 695 - 700
Date:	2010
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	NEW YORK
ISSN:	1752-0894
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ATMOSPHERIC CO2; CENTRAL CHILE; EL-NINO; CLIMATE; PRECIPITATION; VARIABILITY; OCEAN; COVARIABILITY; ANTARCTICA; EVOLUTION Multiple languages Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49604