Antarctic climate variability on regional and continental scales over the last 2000 years
Climate trends in the Antarctic region remain poorly characterized, owing to the brevity and scarcity of direct climate observations and the large magnitude of interannual to decadal-scale climate variability. Here, within the framework of the PAGES Antarctica2k working group, we build an enlarged d...
Published in: | Climate of the Past |
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Online Access: | http://hdl.handle.net/1885/143566 https://doi.org/10.5194/cp-13-1609-2017 https://openresearch-repository.anu.edu.au/bitstream/1885/143566/4/Stenni2017_Climate%20of%20the%20Past_Antarctica2k.pdf.jpg |
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/143566 2024-01-14T10:00:37+01:00 Antarctic climate variability on regional and continental scales over the last 2000 years Stenni, Barbara Curran, Mark A. J. Abram, Nerilie Orsi, Anais Goursaud, Sentia Masson-Delmotte, Valerie Neukom, Raphael Goosse, Hugues Divine, Dmitry van Ommen, Tas Steig, Eric J. Dixon, Daniel A. Thomas, Elizabeth R. Bertler, Nancy A. N. Isaksson, Elisabeth Ekaykin, Alexey Werner, Martin Frezzotti, Massimo application/pdf http://hdl.handle.net/1885/143566 https://doi.org/10.5194/cp-13-1609-2017 https://openresearch-repository.anu.edu.au/bitstream/1885/143566/4/Stenni2017_Climate%20of%20the%20Past_Antarctica2k.pdf.jpg unknown European Geosciences Union http://purl.org/au-research/grants/arc/DP140102059 http://purl.org/au-research/grants/arc/CE1101028 1814-9332 http://hdl.handle.net/1885/143566 doi:10.5194/cp-13-1609-2017 https://openresearch-repository.anu.edu.au/bitstream/1885/143566/4/Stenni2017_Climate%20of%20the%20Past_Antarctica2k.pdf.jpg © 2017 Author(s) https://creativecommons.org/licenses/by/3.0/au/ Creative Commons Attribution 3.0 License. Climate of the Past Journal article ftanucanberra https://doi.org/10.5194/cp-13-1609-2017 2023-12-15T09:33:10Z Climate trends in the Antarctic region remain poorly characterized, owing to the brevity and scarcity of direct climate observations and the large magnitude of interannual to decadal-scale climate variability. Here, within the framework of the PAGES Antarctica2k working group, we build an enlarged database of ice core water stable isotope records from Antarctica, consisting of 112 records. We produce both unweighted and weighted isotopic (δ¹⁸O) composites and temperature reconstructions since 0 CE, binned at 5- and 10-year resolution, for seven climatically distinct regions covering the Antarctic continent. Following earlier work of the Antarctica2k working group, we also produce composites and reconstructions for the broader regions of East Antarctica, West Antarctica and the whole continent. We use three methods for our temperature reconstructions: (i) a temperature scaling based on the δ¹⁸O–temperature relationship output from an ECHAM5-wiso model simulation nudged to ERA-Interim atmospheric reanalyses from 1979 to 2013, and adjusted for the West Antarctic Ice Sheet region to borehole temperature data, (ii) a temperature scaling of the isotopic normalized anomalies to the variance of the regional reanalysis temperature and (iii) a composite-plus-scaling approach used in a previous continent-scale reconstruction of Antarctic temperature since 1 CE but applied to the new Antarctic ice core database. Our new reconstructions confirm a significant cooling trend from 0 to 1900 CE across all Antarctic regions where records extend back into the 1st millennium, with the exception of the Wilkes Land coast and Weddell Sea coast regions. Within this long-term cooling trend from 0 to 1900 CE, we find that the warmest period occurs between 300 and 1000 CE, and the coldest interval occurs from 1200 to 1900 CE. Since 1900 CE, significant warming trends are identified for the West Antarctic Ice Sheet, the Dronning Maud Land coast and the Antarctic Peninsula regions, and these trends are robust across the distribution of ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land East Antarctica ice core Ice Sheet Weddell Sea West Antarctica Wilkes Land Australian National University: ANU Digital Collections Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Dronning Maud Land West Antarctica West Antarctic Ice Sheet Weddell Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Climate of the Past 13 11 1609 1634 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
description |
Climate trends in the Antarctic region remain poorly characterized, owing to the brevity and scarcity of direct climate observations and the large magnitude of interannual to decadal-scale climate variability. Here, within the framework of the PAGES Antarctica2k working group, we build an enlarged database of ice core water stable isotope records from Antarctica, consisting of 112 records. We produce both unweighted and weighted isotopic (δ¹⁸O) composites and temperature reconstructions since 0 CE, binned at 5- and 10-year resolution, for seven climatically distinct regions covering the Antarctic continent. Following earlier work of the Antarctica2k working group, we also produce composites and reconstructions for the broader regions of East Antarctica, West Antarctica and the whole continent. We use three methods for our temperature reconstructions: (i) a temperature scaling based on the δ¹⁸O–temperature relationship output from an ECHAM5-wiso model simulation nudged to ERA-Interim atmospheric reanalyses from 1979 to 2013, and adjusted for the West Antarctic Ice Sheet region to borehole temperature data, (ii) a temperature scaling of the isotopic normalized anomalies to the variance of the regional reanalysis temperature and (iii) a composite-plus-scaling approach used in a previous continent-scale reconstruction of Antarctic temperature since 1 CE but applied to the new Antarctic ice core database. Our new reconstructions confirm a significant cooling trend from 0 to 1900 CE across all Antarctic regions where records extend back into the 1st millennium, with the exception of the Wilkes Land coast and Weddell Sea coast regions. Within this long-term cooling trend from 0 to 1900 CE, we find that the warmest period occurs between 300 and 1000 CE, and the coldest interval occurs from 1200 to 1900 CE. Since 1900 CE, significant warming trends are identified for the West Antarctic Ice Sheet, the Dronning Maud Land coast and the Antarctic Peninsula regions, and these trends are robust across the distribution of ... |
format |
Article in Journal/Newspaper |
author |
Stenni, Barbara Curran, Mark A. J. Abram, Nerilie Orsi, Anais Goursaud, Sentia Masson-Delmotte, Valerie Neukom, Raphael Goosse, Hugues Divine, Dmitry van Ommen, Tas Steig, Eric J. Dixon, Daniel A. Thomas, Elizabeth R. Bertler, Nancy A. N. Isaksson, Elisabeth Ekaykin, Alexey Werner, Martin Frezzotti, Massimo |
spellingShingle |
Stenni, Barbara Curran, Mark A. J. Abram, Nerilie Orsi, Anais Goursaud, Sentia Masson-Delmotte, Valerie Neukom, Raphael Goosse, Hugues Divine, Dmitry van Ommen, Tas Steig, Eric J. Dixon, Daniel A. Thomas, Elizabeth R. Bertler, Nancy A. N. Isaksson, Elisabeth Ekaykin, Alexey Werner, Martin Frezzotti, Massimo Antarctic climate variability on regional and continental scales over the last 2000 years |
author_facet |
Stenni, Barbara Curran, Mark A. J. Abram, Nerilie Orsi, Anais Goursaud, Sentia Masson-Delmotte, Valerie Neukom, Raphael Goosse, Hugues Divine, Dmitry van Ommen, Tas Steig, Eric J. Dixon, Daniel A. Thomas, Elizabeth R. Bertler, Nancy A. N. Isaksson, Elisabeth Ekaykin, Alexey Werner, Martin Frezzotti, Massimo |
author_sort |
Stenni, Barbara |
title |
Antarctic climate variability on regional and continental scales over the last 2000 years |
title_short |
Antarctic climate variability on regional and continental scales over the last 2000 years |
title_full |
Antarctic climate variability on regional and continental scales over the last 2000 years |
title_fullStr |
Antarctic climate variability on regional and continental scales over the last 2000 years |
title_full_unstemmed |
Antarctic climate variability on regional and continental scales over the last 2000 years |
title_sort |
antarctic climate variability on regional and continental scales over the last 2000 years |
publisher |
European Geosciences Union |
url |
http://hdl.handle.net/1885/143566 https://doi.org/10.5194/cp-13-1609-2017 https://openresearch-repository.anu.edu.au/bitstream/1885/143566/4/Stenni2017_Climate%20of%20the%20Past_Antarctica2k.pdf.jpg |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Dronning Maud Land West Antarctica West Antarctic Ice Sheet Weddell Wilkes Land |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Dronning Maud Land West Antarctica West Antarctic Ice Sheet Weddell Wilkes Land |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land East Antarctica ice core Ice Sheet Weddell Sea West Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land East Antarctica ice core Ice Sheet Weddell Sea West Antarctica Wilkes Land |
op_source |
Climate of the Past |
op_relation |
http://purl.org/au-research/grants/arc/DP140102059 http://purl.org/au-research/grants/arc/CE1101028 1814-9332 http://hdl.handle.net/1885/143566 doi:10.5194/cp-13-1609-2017 https://openresearch-repository.anu.edu.au/bitstream/1885/143566/4/Stenni2017_Climate%20of%20the%20Past_Antarctica2k.pdf.jpg |
op_rights |
© 2017 Author(s) https://creativecommons.org/licenses/by/3.0/au/ Creative Commons Attribution 3.0 License. |
op_doi |
https://doi.org/10.5194/cp-13-1609-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
11 |
container_start_page |
1609 |
op_container_end_page |
1634 |
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1788066494653923328 |