Universität zu Köln

Berg, Sonja ORCID: 0000-0002-9629-6007, White, Duanne A., Jivcov, Sandra, Melles, Martin, Leng, Melanie J., Rethemeyer, Janet, Allen, Claire, Perren, Bianca ORCID: 0000-0001-6089-6468, Bennike, Ole and Viehberg, Finn (2019). Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet. Quat. Res., 91 (1). S. 132 - 149. NEW YORK: CAMBRIDGE UNIV PRESS. ISSN 1096-0287

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Abstract

The subantarctic island of South Georgia provides terrestrial and coastal marine records of climate variability, which are crucial for the understanding of the drivers of Holocene climate changes in the subantarctic region. Here we investigate a sediment core (Co1305) from a coastal inlet on South Georgia using elemental, lipid biomarker, diatom, and stable isotope data to infer changes in environmental conditions and to constrain the timing of late-glacial and Holocene glacier fluctuations. Because of the scarcity of terrestrial macrofossils and the presence of redeposited and relict organic matter in the sediments, age control for the record was obtained by compound-specific radiocarbon dating of mostly marine-derived n-C-16 fatty acids. A basal till layer recovered in Little Jason Lagoon was likely deposited during an advance of local glaciers during the Antarctic cold reversal. After glacier retreat, an oligotrophic lake occupied the site, which transitioned to a marine inlet around 8.0 +/- 0.9 ka because of relative sea-level rise. From 7.0 +/- 0.6 to 4.0 +/- 0.4 ka, reduced vegetation coverage in the catchment, as well as high siliciclastic input and deposition of ice-rafted debris, indicates glacier advances in the terrestrial catchment and likely in the adjacent fjord. A second, less extensive period of glacier advances occurred in the late Holocene, after 1.8 +/- 0.3 ka.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Berg, Sonja UNSPECIFIED orcid.org/0000-0002-9629-6007 UNSPECIFIED White, Duanne A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jivcov, Sandra UNSPECIFIED UNSPECIFIED UNSPECIFIED Melles, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Leng, Melanie J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, Janet UNSPECIFIED UNSPECIFIED UNSPECIFIED Allen, Claire UNSPECIFIED UNSPECIFIED UNSPECIFIED Perren, Bianca UNSPECIFIED orcid.org/0000-0001-6089-6468 UNSPECIFIED Bennike, Ole UNSPECIFIED UNSPECIFIED UNSPECIFIED Viehberg, Finn UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-160538
DOI:	10.1017/qua.2018.85
Journal or Publication Title:	Quat. Res.
Volume:	91
Number:	1
Page Range:	S. 132 - 149
Date:	2019
Publisher:	CAMBRIDGE UNIV PRESS
Place of Publication:	NEW YORK
ISSN:	1096-0287
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEMISPHERE WESTERLY WINDS; ORGANIC-MATTER; CUMBERLAND BAY; POTTER COVE; FATTY-ACIDS; C/N RATIOS; CLIMATE; PENINSULA; DEGLACIATION; CARBON Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16053