Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years
The oxygen isotopic composition of planktonic foraminifera tests is one of the widest used geochemical tools to reconstruct past changes of physical parameters of the upper ocean. It is common practice to analyze multiple individuals from a mono-specific population and assume that the outcome reflec...
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Copernicus Publications
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fttriple:oai:gotriple.eu:oai:doaj.org/article:bbe2638c28014f23b3c02c15bf58cd71 2023-05-15T18:00:55+02:00 Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years G. M. Ganssen F. J. C. Peeters B. Metcalfe P. Anand S. J. A. Jung D. Kroon G.-J. A. Brummer 2011-12-01 https://doi.org/10.5194/cp-7-1337-2011 http://www.clim-past.net/7/1337/2011/cp-7-1337-2011.pdf https://doaj.org/article/bbe2638c28014f23b3c02c15bf58cd71 en eng Copernicus Publications doi:10.5194/cp-7-1337-2011 1814-9324 1814-9332 http://www.clim-past.net/7/1337/2011/cp-7-1337-2011.pdf https://doaj.org/article/bbe2638c28014f23b3c02c15bf58cd71 undefined Climate of the Past, Vol 7, Iss 4, Pp 1337-1349 (2011) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2011 fttriple https://doi.org/10.5194/cp-7-1337-2011 2023-01-22T19:16:43Z The oxygen isotopic composition of planktonic foraminifera tests is one of the widest used geochemical tools to reconstruct past changes of physical parameters of the upper ocean. It is common practice to analyze multiple individuals from a mono-specific population and assume that the outcome reflects a mean value of the environmental conditions during calcification of the analyzed individuals. Here we present the oxygen isotope composition of individual specimens of the surface-dwelling species Globigerinoides ruber and Globigerina bulloides from sediment cores in the Western Arabian Sea off Somalia, inferred as indicators of past seasonal ranges in temperature. Combining the δ18O measurements of individual specimens to obtain temperature ranges with Mg/Ca based mean calcification temperatures allows us to reconstruct temperature extrema. Our results indicate that over the past 20 kyr the seasonal temperature range has fluctuated from its present value of 16 °C to mean values of 13 °C and 11 °C for the Holocene and LGM, respectively. The data for the LGM suggest that the maximum temperature was lower, whilst minimum temperature remained approximately constant. The rather minor variability in lowest summer temperatures during the LGM suggests roughly constant summer monsoon intensity, while upwelling-induced productivity was lowered. Article in Journal/Newspaper Planktonic foraminifera Unknown Climate of the Past 7 4 1337 1349 |
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envir geo G. M. Ganssen F. J. C. Peeters B. Metcalfe P. Anand S. J. A. Jung D. Kroon G.-J. A. Brummer Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years |
topic_facet |
envir geo |
description |
The oxygen isotopic composition of planktonic foraminifera tests is one of the widest used geochemical tools to reconstruct past changes of physical parameters of the upper ocean. It is common practice to analyze multiple individuals from a mono-specific population and assume that the outcome reflects a mean value of the environmental conditions during calcification of the analyzed individuals. Here we present the oxygen isotope composition of individual specimens of the surface-dwelling species Globigerinoides ruber and Globigerina bulloides from sediment cores in the Western Arabian Sea off Somalia, inferred as indicators of past seasonal ranges in temperature. Combining the δ18O measurements of individual specimens to obtain temperature ranges with Mg/Ca based mean calcification temperatures allows us to reconstruct temperature extrema. Our results indicate that over the past 20 kyr the seasonal temperature range has fluctuated from its present value of 16 °C to mean values of 13 °C and 11 °C for the Holocene and LGM, respectively. The data for the LGM suggest that the maximum temperature was lower, whilst minimum temperature remained approximately constant. The rather minor variability in lowest summer temperatures during the LGM suggests roughly constant summer monsoon intensity, while upwelling-induced productivity was lowered. |
format |
Article in Journal/Newspaper |
author |
G. M. Ganssen F. J. C. Peeters B. Metcalfe P. Anand S. J. A. Jung D. Kroon G.-J. A. Brummer |
author_facet |
G. M. Ganssen F. J. C. Peeters B. Metcalfe P. Anand S. J. A. Jung D. Kroon G.-J. A. Brummer |
author_sort |
G. M. Ganssen |
title |
Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years |
title_short |
Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years |
title_full |
Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years |
title_fullStr |
Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years |
title_full_unstemmed |
Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years |
title_sort |
quantifying sea surface temperature ranges of the arabian sea for the past 20 000 years |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/cp-7-1337-2011 http://www.clim-past.net/7/1337/2011/cp-7-1337-2011.pdf https://doaj.org/article/bbe2638c28014f23b3c02c15bf58cd71 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Climate of the Past, Vol 7, Iss 4, Pp 1337-1349 (2011) |
op_relation |
doi:10.5194/cp-7-1337-2011 1814-9324 1814-9332 http://www.clim-past.net/7/1337/2011/cp-7-1337-2011.pdf https://doaj.org/article/bbe2638c28014f23b3c02c15bf58cd71 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-7-1337-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
4 |
container_start_page |
1337 |
op_container_end_page |
1349 |
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1766170196071940096 |