Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes
Daily weather regimes are defined around the Kerguelen Islands (Southern Ocean) on the basis of daily 500-hPa geopotential height anomalies derived from the ERA5 ensemble reanalysis over the period 1979–2018. Ten regimes are retained as significant. Their occurrences are highly consistent across rea...
Published in: | Journal of Applied Meteorology and Climatology |
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ftvliz:oai:oma.vliz.be:353625 2023-05-15T13:42:51+02:00 Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes Pohl, B. Saucède, T. Favier, V. Pergaud, J. Verfaillie, D. Feral, J.-P. Krasniqi, Y. Richard, Y. 2021 https://www.vliz.be/nl/open-marien-archief?module=ref&refid=353625 en eng info:eu-repo/semantics/altIdentifier/wos/000660818400006 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1175/JAMC-D-20-0255.1 https://www.vliz.be/nl/open-marien-archief?module=ref&refid=353625 info:eu-repo/semantics/restrictedAccess %3Ci%3EJournal+of+Applied+Meteorology+and+Climatology+60%285%29%3C%2Fi%3E%3A+711-731.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1175%2FJAMC-D-20-0255.1%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1175%2FJAMC-D-20-0255.1%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftvliz https://doi.org/10.1175/JAMC-D-20-0255.1 2022-07-13T22:23:26Z Daily weather regimes are defined around the Kerguelen Islands (Southern Ocean) on the basis of daily 500-hPa geopotential height anomalies derived from the ERA5 ensemble reanalysis over the period 1979–2018. Ten regimes are retained as significant. Their occurrences are highly consistent across reanalysis ensemble members. Regimes show weak seasonality and nonsignificant long-term trends in their occurrences. Their sequences are usually short (1–3 days), with extreme persistence values above 10 days. Seasonal regime frequency is mostly driven by the phase of the southern annular mode over Antarctica, midlatitude dynamics over the Southern Ocean such as the Pacific–South American mode, and, to a lesser extent, tropical variability, with significant but weaker relationships with El Niño–Southern Oscillation. At the local scale over the Kerguelen Islands, regimes have a strong influence on measured atmospheric and oceanic variables, including minimum and maximum air temperature, mostly driven by horizontal advections, seawater temperature recorded 5 m below the surface, wind speed, and sea level pressure. Relationships are weaker for precipitation amounts. Regimes also modify regional contrasts between observational sites in Kerguelen, highlighting strong exposure contrasts. The regimes allow us to improve our understanding of weather and climate variability and interactions in this region; they will be used in future work to assess past and projected long-term circulation changes in the southern midlatitudes. Article in Journal/Newspaper Antarc* Antarctica Kerguelen Islands Southern Ocean Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Southern Ocean Kerguelen Kerguelen Islands Pacific Journal of Applied Meteorology and Climatology |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
Daily weather regimes are defined around the Kerguelen Islands (Southern Ocean) on the basis of daily 500-hPa geopotential height anomalies derived from the ERA5 ensemble reanalysis over the period 1979–2018. Ten regimes are retained as significant. Their occurrences are highly consistent across reanalysis ensemble members. Regimes show weak seasonality and nonsignificant long-term trends in their occurrences. Their sequences are usually short (1–3 days), with extreme persistence values above 10 days. Seasonal regime frequency is mostly driven by the phase of the southern annular mode over Antarctica, midlatitude dynamics over the Southern Ocean such as the Pacific–South American mode, and, to a lesser extent, tropical variability, with significant but weaker relationships with El Niño–Southern Oscillation. At the local scale over the Kerguelen Islands, regimes have a strong influence on measured atmospheric and oceanic variables, including minimum and maximum air temperature, mostly driven by horizontal advections, seawater temperature recorded 5 m below the surface, wind speed, and sea level pressure. Relationships are weaker for precipitation amounts. Regimes also modify regional contrasts between observational sites in Kerguelen, highlighting strong exposure contrasts. The regimes allow us to improve our understanding of weather and climate variability and interactions in this region; they will be used in future work to assess past and projected long-term circulation changes in the southern midlatitudes. |
format |
Article in Journal/Newspaper |
author |
Pohl, B. Saucède, T. Favier, V. Pergaud, J. Verfaillie, D. Feral, J.-P. Krasniqi, Y. Richard, Y. |
spellingShingle |
Pohl, B. Saucède, T. Favier, V. Pergaud, J. Verfaillie, D. Feral, J.-P. Krasniqi, Y. Richard, Y. Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes |
author_facet |
Pohl, B. Saucède, T. Favier, V. Pergaud, J. Verfaillie, D. Feral, J.-P. Krasniqi, Y. Richard, Y. |
author_sort |
Pohl, B. |
title |
Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes |
title_short |
Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes |
title_full |
Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes |
title_fullStr |
Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes |
title_full_unstemmed |
Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes |
title_sort |
recent climate variability around the kerguelen islands (southern ocean) seen through weather regimes |
publishDate |
2021 |
url |
https://www.vliz.be/nl/open-marien-archief?module=ref&refid=353625 |
geographic |
Southern Ocean Kerguelen Kerguelen Islands Pacific |
geographic_facet |
Southern Ocean Kerguelen Kerguelen Islands Pacific |
genre |
Antarc* Antarctica Kerguelen Islands Southern Ocean |
genre_facet |
Antarc* Antarctica Kerguelen Islands Southern Ocean |
op_source |
%3Ci%3EJournal+of+Applied+Meteorology+and+Climatology+60%285%29%3C%2Fi%3E%3A+711-731.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1175%2FJAMC-D-20-0255.1%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1175%2FJAMC-D-20-0255.1%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000660818400006 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1175/JAMC-D-20-0255.1 https://www.vliz.be/nl/open-marien-archief?module=ref&refid=353625 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1175/JAMC-D-20-0255.1 |
container_title |
Journal of Applied Meteorology and Climatology |
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1766173412553654272 |