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...
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Language: | English |
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Online Access: | https://doi.org/10.5194/cp-13-1609-2017 https://cp.copernicus.org/articles/13/1609/2017/ |
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fttriple:oai:gotriple.eu:cB6Z8iZtOxJC3YFiMhLkV 2023-05-15T13:40:49+02:00 Antarctic climate variability on regional and continental scales over the last 2000 years Stenni, Barbara Curran, Mark A. J. Abram, Nerilie J. Orsi, Anais Goursaud, Sentia Masson-Delmotte, Valerie Neukom, Raphael Goosse, Hugues Divine, Dmitry Ommen, Tas Steig, Eric J. Dixon, Daniel A. Thomas, Elizabeth R. Bertler, Nancy A. N. Isaksson, Elisabeth Ekaykin, Alexey Werner, Martin Frezzotti, Massimo 2018-09-27 https://doi.org/10.5194/cp-13-1609-2017 https://cp.copernicus.org/articles/13/1609/2017/ en eng Copernicus Publications doi:10.5194/cp-13-1609-2017 10670/1.ae40vy 1814-9324 1814-9332 https://cp.copernicus.org/articles/13/1609/2017/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-13-1609-2017 2023-01-22T17:52:01Z 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 Unknown Antarctic Antarctic Peninsula Dronning Maud Land East Antarctica The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Climate of the Past 13 11 1609 1634 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Stenni, Barbara Curran, Mark A. J. Abram, Nerilie J. Orsi, Anais Goursaud, Sentia Masson-Delmotte, Valerie Neukom, Raphael Goosse, Hugues Divine, Dmitry 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 |
topic_facet |
geo envir |
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 J. Orsi, Anais Goursaud, Sentia Masson-Delmotte, Valerie Neukom, Raphael Goosse, Hugues Divine, Dmitry Ommen, Tas Steig, Eric J. Dixon, Daniel A. Thomas, Elizabeth R. Bertler, Nancy A. N. Isaksson, Elisabeth Ekaykin, Alexey Werner, Martin Frezzotti, Massimo |
author_facet |
Stenni, Barbara Curran, Mark A. J. Abram, Nerilie J. Orsi, Anais Goursaud, Sentia Masson-Delmotte, Valerie Neukom, Raphael Goosse, Hugues Divine, Dmitry 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 |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-13-1609-2017 https://cp.copernicus.org/articles/13/1609/2017/ |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic Antarctic Peninsula Dronning Maud Land East Antarctica The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica Wilkes Land |
geographic_facet |
Antarctic Antarctic Peninsula Dronning Maud Land East Antarctica The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica 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 |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-13-1609-2017 10670/1.ae40vy 1814-9324 1814-9332 https://cp.copernicus.org/articles/13/1609/2017/ |
op_rights |
undefined |
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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1766140988309372928 |