Multi‐event analysis of the westerly Greenland tip jet based upon 45 winters in ERA‐40
Abstract The westerly Greenland tip jet is an intense, narrow and intermittent wind phenomenon located southeast of Cape Farewell that occurs frequently during the winter season. Using the ERA‐40 reanalysis dataset, a catalogue of 586 objectively detected westerly tip jet events is compiled for the...
Published in: | Quarterly Journal of the Royal Meteorological Society |
---|---|
Main Authors: | , , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2009
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/qj.488 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.488 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.488 |
id |
crwiley:10.1002/qj.488 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/qj.488 2024-06-09T07:45:19+00:00 Multi‐event analysis of the westerly Greenland tip jet based upon 45 winters in ERA‐40 Våge, Kjetil Spengler, Thomas Davies, Huw C. Pickart, Robert S. NCCR Climate Programme National Science Foundation NSF 2009 http://dx.doi.org/10.1002/qj.488 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.488 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.488 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 135, issue 645, page 1999-2011 ISSN 0035-9009 1477-870X journal-article 2009 crwiley https://doi.org/10.1002/qj.488 2024-05-16T14:29:05Z Abstract The westerly Greenland tip jet is an intense, narrow and intermittent wind phenomenon located southeast of Cape Farewell that occurs frequently during the winter season. Using the ERA‐40 reanalysis dataset, a catalogue of 586 objectively detected westerly tip jet events is compiled for the winters 1957‐2002, and an analysis is undertaken of the character of the jet and its accompanying atmospheric features. It is shown that the tip jet frequency exhibits a significant positive correlation with both the NAO index and the latitude of the Icelandic Low. The peak wind speed and accompanying heat fluxes of the jet have values up to 30 m s −1 and 600 W m −2 , respectively, and are sustained for less than one day. The air parcels constituting the tip jet are shown, based upon a trajectory model and the ERA‐40 dataset, to have a continental origin, and to exhibit a characteristic deflection and acceleration around southern Greenland. The events are almost invariably accompanied both by a notable coherence of the lower‐level tip jet with an overlying upper‐level jet stream, and by a surface cyclone located to the lee of Greenland. It is also shown that the cyclone originates upstream of and is advected to the lee of Greenland, and thereby it both precedes in time and contributes dynamically to the formation of the tip jet. On this basis, it is suggested that the tip jet arises from the interplay of the synoptic‐scale flow evolution and the perturbing effects of Greenland's topography upon the flow. Copyright © 2009 Royal Meteorological Society Article in Journal/Newspaper Cape Farewell Greenland Wiley Online Library Greenland Quarterly Journal of the Royal Meteorological Society 135 645 1999 2011 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The westerly Greenland tip jet is an intense, narrow and intermittent wind phenomenon located southeast of Cape Farewell that occurs frequently during the winter season. Using the ERA‐40 reanalysis dataset, a catalogue of 586 objectively detected westerly tip jet events is compiled for the winters 1957‐2002, and an analysis is undertaken of the character of the jet and its accompanying atmospheric features. It is shown that the tip jet frequency exhibits a significant positive correlation with both the NAO index and the latitude of the Icelandic Low. The peak wind speed and accompanying heat fluxes of the jet have values up to 30 m s −1 and 600 W m −2 , respectively, and are sustained for less than one day. The air parcels constituting the tip jet are shown, based upon a trajectory model and the ERA‐40 dataset, to have a continental origin, and to exhibit a characteristic deflection and acceleration around southern Greenland. The events are almost invariably accompanied both by a notable coherence of the lower‐level tip jet with an overlying upper‐level jet stream, and by a surface cyclone located to the lee of Greenland. It is also shown that the cyclone originates upstream of and is advected to the lee of Greenland, and thereby it both precedes in time and contributes dynamically to the formation of the tip jet. On this basis, it is suggested that the tip jet arises from the interplay of the synoptic‐scale flow evolution and the perturbing effects of Greenland's topography upon the flow. Copyright © 2009 Royal Meteorological Society |
author2 |
NCCR Climate Programme National Science Foundation NSF |
format |
Article in Journal/Newspaper |
author |
Våge, Kjetil Spengler, Thomas Davies, Huw C. Pickart, Robert S. |
spellingShingle |
Våge, Kjetil Spengler, Thomas Davies, Huw C. Pickart, Robert S. Multi‐event analysis of the westerly Greenland tip jet based upon 45 winters in ERA‐40 |
author_facet |
Våge, Kjetil Spengler, Thomas Davies, Huw C. Pickart, Robert S. |
author_sort |
Våge, Kjetil |
title |
Multi‐event analysis of the westerly Greenland tip jet based upon 45 winters in ERA‐40 |
title_short |
Multi‐event analysis of the westerly Greenland tip jet based upon 45 winters in ERA‐40 |
title_full |
Multi‐event analysis of the westerly Greenland tip jet based upon 45 winters in ERA‐40 |
title_fullStr |
Multi‐event analysis of the westerly Greenland tip jet based upon 45 winters in ERA‐40 |
title_full_unstemmed |
Multi‐event analysis of the westerly Greenland tip jet based upon 45 winters in ERA‐40 |
title_sort |
multi‐event analysis of the westerly greenland tip jet based upon 45 winters in era‐40 |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1002/qj.488 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.488 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.488 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Cape Farewell Greenland |
genre_facet |
Cape Farewell Greenland |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 135, issue 645, page 1999-2011 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.488 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
135 |
container_issue |
645 |
container_start_page |
1999 |
op_container_end_page |
2011 |
_version_ |
1801374617288310784 |