Universität zu Köln

Jaeschke, Andrea, Wengler, Marc, Hefter, Jens, Ronge, Thomas A., Geibert, Walter ORCID: 0000-0001-8646-2334, Mollenhauer, Gesine ORCID: 0000-0001-5138-564X, Gersonde, Rainer and Lamy, Frank ORCID: 0000-0001-5952-1765 (2017). A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean. Geochim. Cosmochim. Acta, 204. S. 120 - 140. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1872-9533

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Abstract

In this study, we present a new multiproxy data set of terrigenous input, marine productivity and sea surface temperature (SST) from 52 surface sediment samples collected along E-W transects in the Pacific sector of the Southern Ocean. Allochthonous terrigenous input was characterized by the distribution of plant wax n-alkanes and soil-derived branched glycerol dialkyl glycerol tetraethers (brGDGTs). Th-230-normalized burial of both compound groups were highest close to the potential sources in Australia and New Zealand and are strongly related to lithogenic contents (Th-232), indicating common sources and transport. Detection of both long-chain n-alkanes and brGDGTs at the most remote sites in the open ocean strongly suggests a primarily eolian transport mechanism to at least 110 degrees W, i.e. by prevailing westerly winds. Two independent organic SST proxies were used, the U-37(K') based on alkenones, and the TEX86 based on isoprenoid GDGTs. Both, U-37(K') and TEX86 indices show robust relationships with temperature over a temperature range between 0.5 and 20 degrees C, likely implying different seasonal and regional imprints on the temperature signal. Alkenone-based temperature estimates best reflect modern summer SST in the study area when using the polar calibration of Sikes et al. (1997). In contrast, TEX86-derived temperatures may reflect a subsurface signal rather than surface. Th-230-normalized burial of alkenones is highest close to the Subtropical Front and is positively related to the deposition of lithogenic material throughout the study area. In contrast, highest isoGDGT burial south of the Antarctic Polar Front may be largely controlled by diatom blooms, and thus high opal fluxes during austral summer. (C) 2017 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jaeschke, Andrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Wengler, Marc UNSPECIFIED UNSPECIFIED UNSPECIFIED Hefter, Jens UNSPECIFIED UNSPECIFIED UNSPECIFIED Ronge, Thomas A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Geibert, Walter UNSPECIFIED orcid.org/0000-0001-8646-2334 UNSPECIFIED Mollenhauer, Gesine UNSPECIFIED orcid.org/0000-0001-5138-564X UNSPECIFIED Gersonde, Rainer UNSPECIFIED UNSPECIFIED UNSPECIFIED Lamy, Frank UNSPECIFIED orcid.org/0000-0001-5952-1765 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-232093
DOI:	10.1016/j.gca.2017.01.045
Journal or Publication Title:	Geochim. Cosmochim. Acta
Volume:	204
Page Range:	S. 120 - 140
Date:	2017
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1872-9533
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DIALKYL GLYCEROL TETRAETHERS; MEMBRANE-LIPIDS; ORGANIC-MATTER; ARCHAEAL DIVERSITY; SINKING PARTICLES; SUBTROPICAL FRONT; WESTERN PACIFIC; LATE QUATERNARY; STABLE CARBON; NEW-ZEALAND Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23209