A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean
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 distrib...
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:23209 2023-05-15T13:57:43+02:00 A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean Jaeschke, Andrea Wengler, Marc Hefter, Jens Ronge, Thomas A. Geibert, Walter Mollenhauer, Gesine Gersonde, Rainer Lamy, Frank 2017 https://kups.ub.uni-koeln.de/23209/ eng eng PERGAMON-ELSEVIER SCIENCE LTD 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 ddc:no doc-type:article publishedVersion 2017 ftubkoeln 2022-11-09T07:19:06Z 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. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Cologne University: KUPS Antarctic Austral New Zealand Pacific Southern Ocean The Antarctic |
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Open Polar |
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Cologne University: KUPS |
op_collection_id |
ftubkoeln |
language |
English |
topic |
ddc:no |
spellingShingle |
ddc:no Jaeschke, Andrea Wengler, Marc Hefter, Jens Ronge, Thomas A. Geibert, Walter Mollenhauer, Gesine Gersonde, Rainer Lamy, Frank A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean |
topic_facet |
ddc:no |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Jaeschke, Andrea Wengler, Marc Hefter, Jens Ronge, Thomas A. Geibert, Walter Mollenhauer, Gesine Gersonde, Rainer Lamy, Frank |
author_facet |
Jaeschke, Andrea Wengler, Marc Hefter, Jens Ronge, Thomas A. Geibert, Walter Mollenhauer, Gesine Gersonde, Rainer Lamy, Frank |
author_sort |
Jaeschke, Andrea |
title |
A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean |
title_short |
A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean |
title_full |
A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean |
title_fullStr |
A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean |
title_full_unstemmed |
A biomarker perspective on dust, productivity, and sea surface temperature in the Pacific sector of the Southern Ocean |
title_sort |
biomarker perspective on dust, productivity, and sea surface temperature in the pacific sector of the southern ocean |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2017 |
url |
https://kups.ub.uni-koeln.de/23209/ |
geographic |
Antarctic Austral New Zealand Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral New Zealand Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
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 |
_version_ |
1766265531603615744 |