A late Quaternary record of seasonal sea surface temperatures off southern Africa
The southern Cape coastal region is important for understanding both the behavioural history of modern humans, and regional and global climate dynamics, because it boasts a long archaeological record and occupies a key geographical location near the intersection of two major oceans. The western boun...
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fttriple:oai:gotriple.eu:10670/1.hqpp5n 2023-05-15T14:03:00+02:00 A late Quaternary record of seasonal sea surface temperatures off southern Africa Loftus, E. Sealy, J. Leng, M. J. Lee-thorp, J. A. https://doi.org/10.1016/j.quascirev.2017.07.003 https://archimer.ifremer.fr/doc/00495/60711/83613.pdf https://archimer.ifremer.fr/doc/00495/60711/ en eng Pergamon-elsevier Science Ltd doi:10.1016/j.quascirev.2017.07.003 10670/1.hqpp5n https://archimer.ifremer.fr/doc/00495/60711/83613.pdf https://archimer.ifremer.fr/doc/00495/60711/ other Archimer, archive institutionnelle de l'Ifremer Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2017-09 , Vol. 171 , P. 73-84 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1016/j.quascirev.2017.07.003 2023-01-22T18:51:25Z The southern Cape coastal region is important for understanding both the behavioural history of modern humans, and regional and global climate dynamics, because it boasts a long archaeological record and occupies a key geographical location near the intersection of two major oceans. The western boundary Agulhas Current, implicated in global heat exchange dynamics, is an important modulator of southern African climates and yet we understand its past behaviour only broadly as the Current itself scours the coastal shelf and marine sediment core records necessarily provide little detail. Numerous archaeological sites from both the late Pleistocene and Holocene provide the opportunity for reconstruction of near shore seasonal SST records, which respond both to localized wind-driven upwellings and Agulhas temperature shifts, corresponding in turn with terrestrial precipitation trends in the near-coastal and summer rainfall regions. Here we present a record of seasonal SSTs extending over MISS, MIS4, and the Holocene, from serial 8180 measurements of a single gastropod species, Turbo sannaticus. The results show that mean SST shifts accord well with global SST trends, although they are larger than those recorded in the Agulhas Current from coarser-scale marine sediment records. Comparison with a record of Antarctic sea-ice suggests that annual SST amplitude responds to Antarctic sea-ice extent, reflecting the positioning of the regional wind systems that drive upwelling dynamics along the coast. Thus, near shore SST seasonality reflects the relative dominance of the westerly and easterly wind systems. These data provide a new climate archive for an important but understudied climate system. Text Antarc* Antarctic Sea ice Unknown Antarctic Quaternary Science Reviews 171 73 84 |
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envir geo Loftus, E. Sealy, J. Leng, M. J. Lee-thorp, J. A. A late Quaternary record of seasonal sea surface temperatures off southern Africa |
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description |
The southern Cape coastal region is important for understanding both the behavioural history of modern humans, and regional and global climate dynamics, because it boasts a long archaeological record and occupies a key geographical location near the intersection of two major oceans. The western boundary Agulhas Current, implicated in global heat exchange dynamics, is an important modulator of southern African climates and yet we understand its past behaviour only broadly as the Current itself scours the coastal shelf and marine sediment core records necessarily provide little detail. Numerous archaeological sites from both the late Pleistocene and Holocene provide the opportunity for reconstruction of near shore seasonal SST records, which respond both to localized wind-driven upwellings and Agulhas temperature shifts, corresponding in turn with terrestrial precipitation trends in the near-coastal and summer rainfall regions. Here we present a record of seasonal SSTs extending over MISS, MIS4, and the Holocene, from serial 8180 measurements of a single gastropod species, Turbo sannaticus. The results show that mean SST shifts accord well with global SST trends, although they are larger than those recorded in the Agulhas Current from coarser-scale marine sediment records. Comparison with a record of Antarctic sea-ice suggests that annual SST amplitude responds to Antarctic sea-ice extent, reflecting the positioning of the regional wind systems that drive upwelling dynamics along the coast. Thus, near shore SST seasonality reflects the relative dominance of the westerly and easterly wind systems. These data provide a new climate archive for an important but understudied climate system. |
format |
Text |
author |
Loftus, E. Sealy, J. Leng, M. J. Lee-thorp, J. A. |
author_facet |
Loftus, E. Sealy, J. Leng, M. J. Lee-thorp, J. A. |
author_sort |
Loftus, E. |
title |
A late Quaternary record of seasonal sea surface temperatures off southern Africa |
title_short |
A late Quaternary record of seasonal sea surface temperatures off southern Africa |
title_full |
A late Quaternary record of seasonal sea surface temperatures off southern Africa |
title_fullStr |
A late Quaternary record of seasonal sea surface temperatures off southern Africa |
title_full_unstemmed |
A late Quaternary record of seasonal sea surface temperatures off southern Africa |
title_sort |
late quaternary record of seasonal sea surface temperatures off southern africa |
publisher |
Pergamon-elsevier Science Ltd |
url |
https://doi.org/10.1016/j.quascirev.2017.07.003 https://archimer.ifremer.fr/doc/00495/60711/83613.pdf https://archimer.ifremer.fr/doc/00495/60711/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
Archimer, archive institutionnelle de l'Ifremer Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2017-09 , Vol. 171 , P. 73-84 |
op_relation |
doi:10.1016/j.quascirev.2017.07.003 10670/1.hqpp5n https://archimer.ifremer.fr/doc/00495/60711/83613.pdf https://archimer.ifremer.fr/doc/00495/60711/ |
op_rights |
other |
op_doi |
https://doi.org/10.1016/j.quascirev.2017.07.003 |
container_title |
Quaternary Science Reviews |
container_volume |
171 |
container_start_page |
73 |
op_container_end_page |
84 |
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