Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years
Detailed temperature reconstructions over the past 2000 years are important for contextualising modern climate change. The mid‐latitude SE Pacific is a key region in this regard in terms of understanding the climatic linkages between the tropics and southern high latitudes. Multi‐centennial timescal...
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Online Access: | https://epic.awi.de/id/eprint/49177/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018PA003465 https://hdl.handle.net/10013/epic.f24e4de4-e70f-4f3e-a415-c44a28dc1262 |
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ftawi:oai:epic.awi.de:49177 2024-09-15T17:46:18+00:00 Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years Collins, James A. Lamy, Frank Kaiser, Jérôme Ruggieri, Nicoletta Henkel, Susann de Pol-Holz, Ricardo Garreaud, René Arz, Helge W. 2019-02-16 https://epic.awi.de/id/eprint/49177/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018PA003465 https://hdl.handle.net/10013/epic.f24e4de4-e70f-4f3e-a415-c44a28dc1262 unknown Collins, J. A. , Lamy, F. , Kaiser, J. , Ruggieri, N. , Henkel, S. , de Pol-Holz, R. , Garreaud, R. and Arz, H. W. (2019) Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years , Paleoceanography and Paleoclimatology . doi:10.1029/2018PA003465 <https://doi.org/10.1029/2018PA003465> , hdl:10013/epic.f24e4de4-e70f-4f3e-a415-c44a28dc1262 EPIC3Paleoceanography and Paleoclimatology Article isiRev 2019 ftawi https://doi.org/10.1029/2018PA003465 2024-06-24T04:22:11Z Detailed temperature reconstructions over the past 2000 years are important for contextualising modern climate change. The mid‐latitude SE Pacific is a key region in this regard in terms of understanding the climatic linkages between the tropics and southern high latitudes. Multi‐centennial timescale temperature variability remains, however, poorly understood, due to a lack of long, high‐temporal‐resolution temperature records from this region and from the southern high latitudes in general. We present a unique alkenone sea surface temperature (SST) record from 44°S on the southern Chilean margin in the SE Pacific spanning the last 2300 years at decadal resolution. The record displays relatively large changes including a cooling transition from 14°C to 12.5°C between 1100 and 600 cal yrs BP, in line with other Chile margin SST records and coeval with Antarctic cooling. This cooling is attributable to reduced Southern Ocean deep convection, driven by a late Holocene sea‐ice increase in the Weddell Sea associated with increased El‐Niño Southern Oscillation (ENSO) variability. Superimposed on the late Holocene cooling we observe multi‐centennial timescale SST variability, including relatively cool SSTs (12.5°C) from 950 to 500 cal yrs BP, corresponding to the Medieval Climate Anomaly, and warmer SSTs (13°C) from 500 to 200 cal yrs BP, corresponding to the Little Ice Age. These oscillations may reflect either multi‐centennial internal variability of the Southern Ocean deep convection and/or multi‐centennial variability in the phasing of ENSO and Southern Annular Mode (SAM) events. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Paleoceanography and Paleoclimatology 34 3 336 352 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Detailed temperature reconstructions over the past 2000 years are important for contextualising modern climate change. The mid‐latitude SE Pacific is a key region in this regard in terms of understanding the climatic linkages between the tropics and southern high latitudes. Multi‐centennial timescale temperature variability remains, however, poorly understood, due to a lack of long, high‐temporal‐resolution temperature records from this region and from the southern high latitudes in general. We present a unique alkenone sea surface temperature (SST) record from 44°S on the southern Chilean margin in the SE Pacific spanning the last 2300 years at decadal resolution. The record displays relatively large changes including a cooling transition from 14°C to 12.5°C between 1100 and 600 cal yrs BP, in line with other Chile margin SST records and coeval with Antarctic cooling. This cooling is attributable to reduced Southern Ocean deep convection, driven by a late Holocene sea‐ice increase in the Weddell Sea associated with increased El‐Niño Southern Oscillation (ENSO) variability. Superimposed on the late Holocene cooling we observe multi‐centennial timescale SST variability, including relatively cool SSTs (12.5°C) from 950 to 500 cal yrs BP, corresponding to the Medieval Climate Anomaly, and warmer SSTs (13°C) from 500 to 200 cal yrs BP, corresponding to the Little Ice Age. These oscillations may reflect either multi‐centennial internal variability of the Southern Ocean deep convection and/or multi‐centennial variability in the phasing of ENSO and Southern Annular Mode (SAM) events. |
format |
Article in Journal/Newspaper |
author |
Collins, James A. Lamy, Frank Kaiser, Jérôme Ruggieri, Nicoletta Henkel, Susann de Pol-Holz, Ricardo Garreaud, René Arz, Helge W. |
spellingShingle |
Collins, James A. Lamy, Frank Kaiser, Jérôme Ruggieri, Nicoletta Henkel, Susann de Pol-Holz, Ricardo Garreaud, René Arz, Helge W. Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years |
author_facet |
Collins, James A. Lamy, Frank Kaiser, Jérôme Ruggieri, Nicoletta Henkel, Susann de Pol-Holz, Ricardo Garreaud, René Arz, Helge W. |
author_sort |
Collins, James A. |
title |
Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years |
title_short |
Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years |
title_full |
Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years |
title_fullStr |
Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years |
title_full_unstemmed |
Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years |
title_sort |
centennial‐scale se pacific sea surface temperature variability over the past 2300 years |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/49177/ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018PA003465 https://hdl.handle.net/10013/epic.f24e4de4-e70f-4f3e-a415-c44a28dc1262 |
genre |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
op_source |
EPIC3Paleoceanography and Paleoclimatology |
op_relation |
Collins, J. A. , Lamy, F. , Kaiser, J. , Ruggieri, N. , Henkel, S. , de Pol-Holz, R. , Garreaud, R. and Arz, H. W. (2019) Centennial‐scale SE Pacific sea surface temperature variability over the past 2300 years , Paleoceanography and Paleoclimatology . doi:10.1029/2018PA003465 <https://doi.org/10.1029/2018PA003465> , hdl:10013/epic.f24e4de4-e70f-4f3e-a415-c44a28dc1262 |
op_doi |
https://doi.org/10.1029/2018PA003465 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
34 |
container_issue |
3 |
container_start_page |
336 |
op_container_end_page |
352 |
_version_ |
1810494330300792832 |