Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent
Extra-tropical cyclones in the subantarctic play a central role in the poleward transport of heat and moisture into Antarctica, with the latter being a key component of the mass balance of the Antarctic ice sheet. As the climate in this region undergoes substantial changes, it is anticipated that th...
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ftfuberlin:oai:refubium.fu-berlin.de:fub188/22166 2023-05-15T13:53:47+02:00 Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent Grieger, Jens Leckebusch, Gregor C. Raible, Christoph C. Rudeva, Irina Simmonds, Ian 2018 18 Seiten application/pdf https://refubium.fu-berlin.de/handle/fub188/22166 https://doi.org/10.17169/refubium-5 https://doi.org/10.1080/16000870.2018.1454808 eng eng https://refubium.fu-berlin.de/handle/fub188/22166 http://dx.doi.org/10.17169/refubium-5 doi:10.1080/16000870.2018.1454808 https://creativecommons.org/licenses/by/4.0/ CC-BY extra-tropical cyclones IMILAST cyclone identification Antarctica Southern Ocean ddc:551 doc-type:article 2018 ftfuberlin https://doi.org/10.17169/refubium-5 https://doi.org/10.1080/16000870.2018.1454808 2022-05-15T20:45:42Z Extra-tropical cyclones in the subantarctic play a central role in the poleward transport of heat and moisture into Antarctica, with the latter being a key component of the mass balance of the Antarctic ice sheet. As the climate in this region undergoes substantial changes, it is anticipated that the character of these synoptic features will change. There are a number of different methods used to identify and track cyclones, which can potentially lead to different conclusions as to cyclone variability and trends, and mechanisms which drive these features. Given this, it is timely to assess the level of consensus among 14 state-of-the-art cyclone identification and tracking methods. We undertake this comparison with the ERA-Interim data-set for the period 1979–2008 and find large differences in the number of tracks identified by different methods, but the spatial patterns of the system density broadly agree. Links between large-scale modes of variability, such as the Southern Annular Mode (SAM), and subantarctic cyclones as suggested in the literature are confirmed by our analysis. Trends in the number of cyclone tracks show a more diverse picture. Robust trends are identified by almost all methods for austral summer over the region south to 60°S, mainly due to the strong relation to SAM, whereas in austral winter the methods disagree in the statistical significance of the trends. The agreement among the methods is greater when the comparison is confined to the stronger cyclones. This is confirmed by a moisture flux analysis associated with these strong synoptic systems. Our results indicate that multiple cyclone identification and tracking methods should be used to obtain robust conclusions for trends in cyclone characteristics as well as their relation to the large-scale circulation in the subantarctic region. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Southern Ocean Freie Universität Berlin: Refubium (FU Berlin) Antarctic Austral Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Freie Universität Berlin: Refubium (FU Berlin) |
op_collection_id |
ftfuberlin |
language |
English |
topic |
extra-tropical cyclones IMILAST cyclone identification Antarctica Southern Ocean ddc:551 |
spellingShingle |
extra-tropical cyclones IMILAST cyclone identification Antarctica Southern Ocean ddc:551 Grieger, Jens Leckebusch, Gregor C. Raible, Christoph C. Rudeva, Irina Simmonds, Ian Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent |
topic_facet |
extra-tropical cyclones IMILAST cyclone identification Antarctica Southern Ocean ddc:551 |
description |
Extra-tropical cyclones in the subantarctic play a central role in the poleward transport of heat and moisture into Antarctica, with the latter being a key component of the mass balance of the Antarctic ice sheet. As the climate in this region undergoes substantial changes, it is anticipated that the character of these synoptic features will change. There are a number of different methods used to identify and track cyclones, which can potentially lead to different conclusions as to cyclone variability and trends, and mechanisms which drive these features. Given this, it is timely to assess the level of consensus among 14 state-of-the-art cyclone identification and tracking methods. We undertake this comparison with the ERA-Interim data-set for the period 1979–2008 and find large differences in the number of tracks identified by different methods, but the spatial patterns of the system density broadly agree. Links between large-scale modes of variability, such as the Southern Annular Mode (SAM), and subantarctic cyclones as suggested in the literature are confirmed by our analysis. Trends in the number of cyclone tracks show a more diverse picture. Robust trends are identified by almost all methods for austral summer over the region south to 60°S, mainly due to the strong relation to SAM, whereas in austral winter the methods disagree in the statistical significance of the trends. The agreement among the methods is greater when the comparison is confined to the stronger cyclones. This is confirmed by a moisture flux analysis associated with these strong synoptic systems. Our results indicate that multiple cyclone identification and tracking methods should be used to obtain robust conclusions for trends in cyclone characteristics as well as their relation to the large-scale circulation in the subantarctic region. |
format |
Article in Journal/Newspaper |
author |
Grieger, Jens Leckebusch, Gregor C. Raible, Christoph C. Rudeva, Irina Simmonds, Ian |
author_facet |
Grieger, Jens Leckebusch, Gregor C. Raible, Christoph C. Rudeva, Irina Simmonds, Ian |
author_sort |
Grieger, Jens |
title |
Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent |
title_short |
Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent |
title_full |
Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent |
title_fullStr |
Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent |
title_full_unstemmed |
Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent |
title_sort |
subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent |
publishDate |
2018 |
url |
https://refubium.fu-berlin.de/handle/fub188/22166 https://doi.org/10.17169/refubium-5 https://doi.org/10.1080/16000870.2018.1454808 |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Southern Ocean |
op_relation |
https://refubium.fu-berlin.de/handle/fub188/22166 http://dx.doi.org/10.17169/refubium-5 doi:10.1080/16000870.2018.1454808 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.17169/refubium-5 https://doi.org/10.1080/16000870.2018.1454808 |
_version_ |
1766259230198726656 |