Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009
Directional analysis has been used to study changes in the sub-polar climate of the mountainous and glacierised sub-Antarctic island of South Georgia (54-55°S, 36-38°W). Significantly for climate change studies, South Georgia lies in the Scotia Sea between polar and temperate latitudes, and approxim...
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ftulancaster:oai:eprints.lancs.ac.uk:53463 2023-05-15T14:01:35+02:00 Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009 Ferranti, E. J. S. Solera Garcia, Maria Angeles Timmis, Roger James Whyatt, Duncan 2010 https://eprints.lancs.ac.uk/id/eprint/53463/ unknown Ferranti, E. J. S. and Solera Garcia, Maria Angeles and Timmis, Roger James and Whyatt, Duncan (2010) Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009. In: EGU General Assembly 2010, 2010-05-01. Contribution to Conference NonPeerReviewed 2010 ftulancaster 2023-03-12T19:01:29Z Directional analysis has been used to study changes in the sub-polar climate of the mountainous and glacierised sub-Antarctic island of South Georgia (54-55°S, 36-38°W). Significantly for climate change studies, South Georgia lies in the Scotia Sea between polar and temperate latitudes, and approximately 1000 km northeast and downwind of the Antarctic Peninsula - one of the fastest-warming regions on Earth (Vaughan et al., 2001). South Georgia was chosen for directional analysis because its climate is substantially advected by predominantly westerly circulations, and because it has a long (since 1905) meteorological record from King Edward Point (KEP) on its eastern side. Additional shorter records from Bird Island at the northwest tip of South Georgia allow comparison between windward (Bird Island) and leeward (KEP) climate regimes. The variation of mountain barrier heights with direction from KEP allows climate changes to be studied under different amounts of orographic influence (from ~700 m to ~2200 m). Records of glacier advance and retreat provide further independent evidence of climate change for comparison with the meteorological record. Directional climate analysis is based on a series of monthly-mean pressure fields defining the orientation and strength of synoptic-scale air-mass advection over the Scotia Sea. These fields are used to define directional climatologies for six 30° sectors with bearings from 150-180° to 300-330°; these sectors encompass 99% of recorded months since 1905. The climatologies summarise the frequencies of air masses from each sector, and the accompanying temperatures and precipitation. The 6 sectors can be broadly associated with 4 air-mass types and source regions: (i) sectors 150-210° advect cold polar maritime air that originated over the Antarctic continent before passing over the Weddell Sea, (ii) sectors 210-270° advect warmer, more stable polar maritime air from the Bellingshausen Sea/Antarctic Peninsula region, (iii) sector 270-300° has warmer, drier returning polar ... Text Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Bird Island Scotia Sea Weddell Sea Lancaster University: Lancaster Eprints Antarctic Antarctic Peninsula Bellingshausen Sea Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) King Edward Point ENVELOPE(-36.496,-36.496,-54.284,-54.284) Scotia Sea The Antarctic Weddell Weddell Sea |
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Open Polar |
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Lancaster University: Lancaster Eprints |
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ftulancaster |
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description |
Directional analysis has been used to study changes in the sub-polar climate of the mountainous and glacierised sub-Antarctic island of South Georgia (54-55°S, 36-38°W). Significantly for climate change studies, South Georgia lies in the Scotia Sea between polar and temperate latitudes, and approximately 1000 km northeast and downwind of the Antarctic Peninsula - one of the fastest-warming regions on Earth (Vaughan et al., 2001). South Georgia was chosen for directional analysis because its climate is substantially advected by predominantly westerly circulations, and because it has a long (since 1905) meteorological record from King Edward Point (KEP) on its eastern side. Additional shorter records from Bird Island at the northwest tip of South Georgia allow comparison between windward (Bird Island) and leeward (KEP) climate regimes. The variation of mountain barrier heights with direction from KEP allows climate changes to be studied under different amounts of orographic influence (from ~700 m to ~2200 m). Records of glacier advance and retreat provide further independent evidence of climate change for comparison with the meteorological record. Directional climate analysis is based on a series of monthly-mean pressure fields defining the orientation and strength of synoptic-scale air-mass advection over the Scotia Sea. These fields are used to define directional climatologies for six 30° sectors with bearings from 150-180° to 300-330°; these sectors encompass 99% of recorded months since 1905. The climatologies summarise the frequencies of air masses from each sector, and the accompanying temperatures and precipitation. The 6 sectors can be broadly associated with 4 air-mass types and source regions: (i) sectors 150-210° advect cold polar maritime air that originated over the Antarctic continent before passing over the Weddell Sea, (ii) sectors 210-270° advect warmer, more stable polar maritime air from the Bellingshausen Sea/Antarctic Peninsula region, (iii) sector 270-300° has warmer, drier returning polar ... |
format |
Text |
author |
Ferranti, E. J. S. Solera Garcia, Maria Angeles Timmis, Roger James Whyatt, Duncan |
spellingShingle |
Ferranti, E. J. S. Solera Garcia, Maria Angeles Timmis, Roger James Whyatt, Duncan Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009 |
author_facet |
Ferranti, E. J. S. Solera Garcia, Maria Angeles Timmis, Roger James Whyatt, Duncan |
author_sort |
Ferranti, E. J. S. |
title |
Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009 |
title_short |
Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009 |
title_full |
Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009 |
title_fullStr |
Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009 |
title_full_unstemmed |
Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009 |
title_sort |
directional analysis of sub-antarctic climate change on south georgia 1905-2009 |
publishDate |
2010 |
url |
https://eprints.lancs.ac.uk/id/eprint/53463/ |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(-36.496,-36.496,-54.284,-54.284) |
geographic |
Antarctic Antarctic Peninsula Bellingshausen Sea Bird Island King Edward Point Scotia Sea The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Bellingshausen Sea Bird Island King Edward Point Scotia Sea The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Bird Island Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Bird Island Scotia Sea Weddell Sea |
op_relation |
Ferranti, E. J. S. and Solera Garcia, Maria Angeles and Timmis, Roger James and Whyatt, Duncan (2010) Directional Analysis of Sub-Antarctic Climate Change on South Georgia 1905-2009. In: EGU General Assembly 2010, 2010-05-01. |
_version_ |
1766271498557849600 |