Improving ice core interpretation using in situ and reanalysis data
Back trajectory analysis, provided by the British Atmospheric Data Centre using meteorological parameters from the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis ERA-40 (1980-2001) and operational analysis (2002-2006), is used to investigate transport pathways and source regio...
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American Geophysical Union
2009
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ftnerc:oai:nora.nerc.ac.uk:11313 2023-05-15T13:45:10+02:00 Improving ice core interpretation using in situ and reanalysis data Thomas, E.R. Bracegirdle, T.J. 2009 text http://nora.nerc.ac.uk/id/eprint/11313/ https://nora.nerc.ac.uk/id/eprint/11313/1/2009JD012263.pdf en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/11313/1/2009JD012263.pdf Thomas, E.R. orcid:0000-0002-3010-6493 Bracegirdle, T.J. orcid:0000-0002-8868-4739 . 2009 Improving ice core interpretation using in situ and reanalysis data. Journal of Geophysical Research, 114 (D2), D20116. 8, pp. https://doi.org/10.1029/2009JD012263 <https://doi.org/10.1029/2009JD012263> Meteorology and Climatology Glaciology Publication - Article PeerReviewed 2009 ftnerc https://doi.org/10.1029/2009JD012263 2023-02-04T19:27:17Z Back trajectory analysis, provided by the British Atmospheric Data Centre using meteorological parameters from the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis ERA-40 (1980-2001) and operational analysis (2002-2006), is used to investigate transport pathways and source regions of climate proxies preserved in a new ice core (Gomez) from the southwestern Antarctic Peninsula. The ECMWF data are compared with automatic weather station data and ice core annual accumulation records to demonstrate that the ECMWF data capture a large proportion of the annual and subseasonal precipitation variability at the site. The back trajectories reveal that precipitation preserved in the ice core accumulation record, and hence climate proxies contained therein, originate from the low-pressure systems from the Bellingshausen Sea transported via circumpolar westerly winds. Hence, precipitation-dependent ice core proxies, such as isotopic composition, will be influenced by both localized sea ice extent and large-scale circulation changes, such as the Southern Annular Mode. Sea ice proxies from the ice core are expected to be dominated by sea ice extent in the Bellingshausen Sea but also influenced by sea ice in the Weddell Sea, with a small proportion of air mass trajectories originating from this region during the summer. Comparison with other ice core sites reveals a stronger influence of easterly transport at more northerly locations, thus explaining the observed differences in snow accumulation records between ice cores and the poor correlation with instrumental records at these sites. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea ice core Sea ice Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Weddell Sea Bellingshausen Sea Weddell Gomez ENVELOPE(-58.795,-58.795,-62.196,-62.196) Journal of Geophysical Research 114 D20 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Meteorology and Climatology Glaciology |
spellingShingle |
Meteorology and Climatology Glaciology Thomas, E.R. Bracegirdle, T.J. Improving ice core interpretation using in situ and reanalysis data |
topic_facet |
Meteorology and Climatology Glaciology |
description |
Back trajectory analysis, provided by the British Atmospheric Data Centre using meteorological parameters from the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis ERA-40 (1980-2001) and operational analysis (2002-2006), is used to investigate transport pathways and source regions of climate proxies preserved in a new ice core (Gomez) from the southwestern Antarctic Peninsula. The ECMWF data are compared with automatic weather station data and ice core annual accumulation records to demonstrate that the ECMWF data capture a large proportion of the annual and subseasonal precipitation variability at the site. The back trajectories reveal that precipitation preserved in the ice core accumulation record, and hence climate proxies contained therein, originate from the low-pressure systems from the Bellingshausen Sea transported via circumpolar westerly winds. Hence, precipitation-dependent ice core proxies, such as isotopic composition, will be influenced by both localized sea ice extent and large-scale circulation changes, such as the Southern Annular Mode. Sea ice proxies from the ice core are expected to be dominated by sea ice extent in the Bellingshausen Sea but also influenced by sea ice in the Weddell Sea, with a small proportion of air mass trajectories originating from this region during the summer. Comparison with other ice core sites reveals a stronger influence of easterly transport at more northerly locations, thus explaining the observed differences in snow accumulation records between ice cores and the poor correlation with instrumental records at these sites. |
format |
Article in Journal/Newspaper |
author |
Thomas, E.R. Bracegirdle, T.J. |
author_facet |
Thomas, E.R. Bracegirdle, T.J. |
author_sort |
Thomas, E.R. |
title |
Improving ice core interpretation using in situ and reanalysis data |
title_short |
Improving ice core interpretation using in situ and reanalysis data |
title_full |
Improving ice core interpretation using in situ and reanalysis data |
title_fullStr |
Improving ice core interpretation using in situ and reanalysis data |
title_full_unstemmed |
Improving ice core interpretation using in situ and reanalysis data |
title_sort |
improving ice core interpretation using in situ and reanalysis data |
publisher |
American Geophysical Union |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/11313/ https://nora.nerc.ac.uk/id/eprint/11313/1/2009JD012263.pdf |
long_lat |
ENVELOPE(-58.795,-58.795,-62.196,-62.196) |
geographic |
Antarctic Antarctic Peninsula Weddell Sea Bellingshausen Sea Weddell Gomez |
geographic_facet |
Antarctic Antarctic Peninsula Weddell Sea Bellingshausen Sea Weddell Gomez |
genre |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea ice core Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea ice core Sea ice Weddell Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/11313/1/2009JD012263.pdf Thomas, E.R. orcid:0000-0002-3010-6493 Bracegirdle, T.J. orcid:0000-0002-8868-4739 . 2009 Improving ice core interpretation using in situ and reanalysis data. Journal of Geophysical Research, 114 (D2), D20116. 8, pp. https://doi.org/10.1029/2009JD012263 <https://doi.org/10.1029/2009JD012263> |
op_doi |
https://doi.org/10.1029/2009JD012263 |
container_title |
Journal of Geophysical Research |
container_volume |
114 |
container_issue |
D20 |
_version_ |
1766214485951905792 |