Universität zu Köln

Zolitschka, Bernd ORCID: 0000-0001-8256-0420, Fey, Michael, Janssen, Stephanie, Maidana, Nora I., Mayr, Christoph ORCID: 0000-0001-9002-9963, Wulf, Sabine ORCID: 0000-0003-0229-7656, Haberzettl, Torsten, Corbella, Hugo, Luecke, Andreas, Ohlendorf, Christian and Schaebitz, Frank ORCID: 0000-0003-3879-9308 (2019). Southern Hemispheric Westerlies control sedimentary processes of Laguna Azul (south-eastern Patagonia, Argentina). Holocene, 29 (3). S. 403 - 421. LONDON: SAGE PUBLICATIONS LTD. ISSN 1477-0911

Full text not available from this repository.

Abstract

Multiproxy investigations of lacustrine sediments from Laguna Azul (52 degrees S) document multi-millennial Holocene influences of Southern Hemispheric Westerlies (SHW) on the hydroclimatic variability of south-eastern Patagonia. During the last 4000 years, this hydroclimatic variability is overprinted by centennial warm/dry periods. A cool/wet period from 11,600 to 10,100 cal. BP is succeeded by an early Holocene dry period (10,100-8300 cal. BP) with a shallow lake, strong anoxia, methanogenesis and high salinity. Between 8300 and 4000 cal. BP the influence of SHW weakened, resulting in a freshwater lake considered to be related to less arid conditions. Since 4000 cal. BP, regional temperature decreased accompanied by re-intensification of SHW reaching full strength since 3000 cal. BP. Centred around 2200, 1000 cal. BP and in the 20th century, Laguna Azul experienced century-long warm/dry spells. Between these dry periods, two pronounced moist periods are suggested to be contemporaneous to the Dark Age Cold Period' and the Little Ice Age'. Different from millennial SHW variations, centennial fluctuations appear to be synchronous for South America and the Northern Hemisphere. Changes in solar activity, large volcanic eruptions and/or modulations of ocean circulation are potential triggers for this synchronicity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zolitschka, Bernd UNSPECIFIED orcid.org/0000-0001-8256-0420 UNSPECIFIED Fey, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Janssen, Stephanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Maidana, Nora I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mayr, Christoph UNSPECIFIED orcid.org/0000-0001-9002-9963 UNSPECIFIED Wulf, Sabine UNSPECIFIED orcid.org/0000-0003-0229-7656 UNSPECIFIED Haberzettl, Torsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Corbella, Hugo UNSPECIFIED UNSPECIFIED UNSPECIFIED Luecke, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Ohlendorf, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaebitz, Frank UNSPECIFIED orcid.org/0000-0003-3879-9308 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-155200
DOI:	10.1177/0959683618816446
Journal or Publication Title:	Holocene
Volume:	29
Number:	3
Page Range:	S. 403 - 421
Date:	2019
Publisher:	SAGE PUBLICATIONS LTD
Place of Publication:	LONDON
ISSN:	1477-0911
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LAKE-LEVEL CHANGES; TIERRA-DEL-FUEGO; EL-NINO/SOUTHERN-OSCILLATION; POTROK AIKE ARGENTINA; ATMOSPHERIC CO2; SANTA-CRUZ; PALEOENVIRONMENTAL CHANGES; ANTARCTIC PENINSULA; LATE PLEISTOCENE; ORGANIC-MATTER Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15520