Reconstruction of past shifts in the position of the subtropical front South of New Zealand since the last glacial period
Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, Spain The Subtropical Front (STF) separates warm and saltier subtropical waters from the cold, less saline and nutrient-rich subantarctic waters of the Southern Ocean. Chan...
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ftcsic:oai:digital.csic.es:10261/135868 2024-02-11T10:08:51+01:00 Reconstruction of past shifts in the position of the subtropical front South of New Zealand since the last glacial period Calvo, Eva María Quirós, Laia Bostock, H. Neil, H. Pelejero, Carles 2015-02-24 http://hdl.handle.net/10261/135868 unknown Association for the Sciences of Limnology and Oceanography http://www.sgmeet.com/aslo/granada2015/program.asp Sí 2015 Aquatic Sciences Meeting. Program Book: 97 (2015) http://hdl.handle.net/10261/135868 none póster de congreso http://purl.org/coar/resource_type/c_6670 2015 ftcsic 2024-01-16T10:17:02Z Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, Spain The Subtropical Front (STF) separates warm and saltier subtropical waters from the cold, less saline and nutrient-rich subantarctic waters of the Southern Ocean. Changes in the latitudinal position of the STF are thought to be crucial for the global climate system but past migrations of the STF are not always well constrained due to the insufficient spatial resolution covered by paleorecords. Three marine cores were recovered south of New Zealand, along a latitudinal transect crossing the modern STF position. We are analysing long chain alkenones, as markers of coccolithophore productivity and past sea surface temperatures, and also n-alkanes and n-alcohols, as proxies for continental input. Preliminary results show a 3-4°C temperature gradient during the Holocene between the core locations, while during the last glacial period no temperature gradient existed, with a consistent 8-9°C recorded at all three sites. This suggests a northward displacement of the STF during the cold glacial climate and the prevalence of subantarctic waters at the core sites. The SST evolution will also be compared with changes in past productivity and the input of continental material Peer Reviewed Still Image Southern Ocean Digital.CSIC (Spanish National Research Council) New Zealand Southern Ocean |
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Digital.CSIC (Spanish National Research Council) |
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Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, Spain The Subtropical Front (STF) separates warm and saltier subtropical waters from the cold, less saline and nutrient-rich subantarctic waters of the Southern Ocean. Changes in the latitudinal position of the STF are thought to be crucial for the global climate system but past migrations of the STF are not always well constrained due to the insufficient spatial resolution covered by paleorecords. Three marine cores were recovered south of New Zealand, along a latitudinal transect crossing the modern STF position. We are analysing long chain alkenones, as markers of coccolithophore productivity and past sea surface temperatures, and also n-alkanes and n-alcohols, as proxies for continental input. Preliminary results show a 3-4°C temperature gradient during the Holocene between the core locations, while during the last glacial period no temperature gradient existed, with a consistent 8-9°C recorded at all three sites. This suggests a northward displacement of the STF during the cold glacial climate and the prevalence of subantarctic waters at the core sites. The SST evolution will also be compared with changes in past productivity and the input of continental material Peer Reviewed |
format |
Still Image |
author |
Calvo, Eva María Quirós, Laia Bostock, H. Neil, H. Pelejero, Carles |
spellingShingle |
Calvo, Eva María Quirós, Laia Bostock, H. Neil, H. Pelejero, Carles Reconstruction of past shifts in the position of the subtropical front South of New Zealand since the last glacial period |
author_facet |
Calvo, Eva María Quirós, Laia Bostock, H. Neil, H. Pelejero, Carles |
author_sort |
Calvo, Eva María |
title |
Reconstruction of past shifts in the position of the subtropical front South of New Zealand since the last glacial period |
title_short |
Reconstruction of past shifts in the position of the subtropical front South of New Zealand since the last glacial period |
title_full |
Reconstruction of past shifts in the position of the subtropical front South of New Zealand since the last glacial period |
title_fullStr |
Reconstruction of past shifts in the position of the subtropical front South of New Zealand since the last glacial period |
title_full_unstemmed |
Reconstruction of past shifts in the position of the subtropical front South of New Zealand since the last glacial period |
title_sort |
reconstruction of past shifts in the position of the subtropical front south of new zealand since the last glacial period |
publisher |
Association for the Sciences of Limnology and Oceanography |
publishDate |
2015 |
url |
http://hdl.handle.net/10261/135868 |
geographic |
New Zealand Southern Ocean |
geographic_facet |
New Zealand Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://www.sgmeet.com/aslo/granada2015/program.asp Sí 2015 Aquatic Sciences Meeting. Program Book: 97 (2015) http://hdl.handle.net/10261/135868 |
op_rights |
none |
_version_ |
1790608478469881856 |