Effects of CO2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean.
The aim of this study was to evaluate the applicability of long-chain alkenones in sediments from the South Atlantic for the reconstruction of past sea-surface temperatures and of CO2- and nutrient concentrations. The investigations focused on both the alkenone unsaturation index) and the stable car...
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/3832 2023-05-15T18:21:04+02:00 Effects of CO2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean. Benthien, Albert 2001 104 pp application/pdf https://media.suub.uni-bremen.de/handle/elib/3832 https://nbn-resolving.org/urn:nbn:de:gbv:46-ep000102927 ger ger Universität Bremen FB5 Geowissenschaften Marum – Zentrum für Marine Umweltwissenschaften Berichte, Fachbereich Geowissenschaften, Universität Bremen 0931-0800 https://media.suub.uni-bremen.de/handle/elib/3832 urn:nbn:de:gbv:46-ep000102927 info:eu-repo/semantics/openAccess 550 550 Earth sciences and geology ddc:550 Bericht, Report report 2001 ftsubbremen 2023-03-26T22:09:16Z The aim of this study was to evaluate the applicability of long-chain alkenones in sediments from the South Atlantic for the reconstruction of past sea-surface temperatures and of CO2- and nutrient concentrations. The investigations focused on both the alkenone unsaturation index) and the stable carbon isotope composition of alkenones. The use of alkenone unsaturation index as paleotemperature proxy requires a firm calibration of the index. Already existing calibrations, based on culture experiments and on recent sediments, have confirmed the general validity of the index. Uncertainties exist, however, regarding the season and the water depth at which the alkenone signal is produced. Moreover, it is suggested that a single calibration may not be applicable in all oceanic regions. For this purpose, the alkenone unsaturation index of 87 surface sediment sampies from the western South Atlantic was converted into temperature and compared with modem atlas sea-surface temperatures. 168 Report South Atlantic Ocean Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
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Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
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language |
German |
topic |
550 550 Earth sciences and geology ddc:550 |
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550 550 Earth sciences and geology ddc:550 Benthien, Albert Effects of CO2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean. |
topic_facet |
550 550 Earth sciences and geology ddc:550 |
description |
The aim of this study was to evaluate the applicability of long-chain alkenones in sediments from the South Atlantic for the reconstruction of past sea-surface temperatures and of CO2- and nutrient concentrations. The investigations focused on both the alkenone unsaturation index) and the stable carbon isotope composition of alkenones. The use of alkenone unsaturation index as paleotemperature proxy requires a firm calibration of the index. Already existing calibrations, based on culture experiments and on recent sediments, have confirmed the general validity of the index. Uncertainties exist, however, regarding the season and the water depth at which the alkenone signal is produced. Moreover, it is suggested that a single calibration may not be applicable in all oceanic regions. For this purpose, the alkenone unsaturation index of 87 surface sediment sampies from the western South Atlantic was converted into temperature and compared with modem atlas sea-surface temperatures. 168 |
format |
Report |
author |
Benthien, Albert |
author_facet |
Benthien, Albert |
author_sort |
Benthien, Albert |
title |
Effects of CO2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean. |
title_short |
Effects of CO2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean. |
title_full |
Effects of CO2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean. |
title_fullStr |
Effects of CO2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean. |
title_full_unstemmed |
Effects of CO2 and nutrient concentration on the stable carbon isotope composition of C37:2 alkenones in sediments of the South Atlantic Ocean. |
title_sort |
effects of co2 and nutrient concentration on the stable carbon isotope composition of c37:2 alkenones in sediments of the south atlantic ocean. |
publisher |
Universität Bremen |
publishDate |
2001 |
url |
https://media.suub.uni-bremen.de/handle/elib/3832 https://nbn-resolving.org/urn:nbn:de:gbv:46-ep000102927 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
Berichte, Fachbereich Geowissenschaften, Universität Bremen 0931-0800 https://media.suub.uni-bremen.de/handle/elib/3832 urn:nbn:de:gbv:46-ep000102927 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766200115927711744 |