Polar low le Cygne : Satellite observations and numerical simulations
Abstract A polar low (PL) which occurred in October 1993 over the Norwegian Sea is investigated from an observational and a numerical point of view. This PL has several unique features: it developed early in the season, it lasted for about 3 days, and its trajectory was such that it passed over weat...
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crwiley:10.1256/qj.03.72 2023-12-03T10:18:38+01:00 Polar low le Cygne : Satellite observations and numerical simulations Claud, Chantal Heinemann, Guenther Raustein, Elmer Mcmurdie, Lynn 2004 http://dx.doi.org/10.1256/qj.03.72 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1256%2Fqj.03.72 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1256/qj.03.72 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 130, issue 598, page 1075-1102 ISSN 0035-9009 1477-870X Atmospheric Science journal-article 2004 crwiley https://doi.org/10.1256/qj.03.72 2023-11-09T13:17:32Z Abstract A polar low (PL) which occurred in October 1993 over the Norwegian Sea is investigated from an observational and a numerical point of view. This PL has several unique features: it developed early in the season, it lasted for about 3 days, and its trajectory was such that it passed over weather stations so that ‘conventional’ observations of the low are available. The conditions of the formation, development and decay of the PL are investigated using a double approach: satellite data from several instruments are used together to document the mesoscale structure of the low, and two versions of a limited‐area model are run to investigate the dynamics of the low. Numerical model fields are compared to quantities derived from TIROS‐N Operational Vertical Sounder, the Special Sensor Microwave/Imager, and satellite radar altimeter data. In spite of a better spatial resolution of the models, humidity and surface wind speeds are less organized in the simulations than in satellite retrievals. The number of vertical levels, especially for the lowest layers of the atmosphere, appears to be an essential component for a good simulation of the trajectory of the low. There is, however, good overall agreement between modelled and satellite‐derived fields, and the good quality of the simulations allows inferences to be made regarding the essential physical and dynamical processes taking place during the formation and development of the PL. We find that the PL was the result of favourable flow conditions at the surface in the form of a shallow arctic front established south of the ice edge, together with an upper‐level potential‐vorticity anomaly setting the stage for a positive interaction. Later on, the strong surface sensible‐ and latent‐heat fluxes contributed to the extensive vertical development. This study demonstrates the usefulness of the approach adopted here, which relies not only on simulations but also on observations to get a very complete description of such disturbances. Copyright © 2004 Royal ... Article in Journal/Newspaper Arctic Norwegian Sea Wiley Online Library (via Crossref) Arctic Norwegian Sea Quarterly Journal of the Royal Meteorological Society 130 598 1075 1102 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Atmospheric Science |
spellingShingle |
Atmospheric Science Claud, Chantal Heinemann, Guenther Raustein, Elmer Mcmurdie, Lynn Polar low le Cygne : Satellite observations and numerical simulations |
topic_facet |
Atmospheric Science |
description |
Abstract A polar low (PL) which occurred in October 1993 over the Norwegian Sea is investigated from an observational and a numerical point of view. This PL has several unique features: it developed early in the season, it lasted for about 3 days, and its trajectory was such that it passed over weather stations so that ‘conventional’ observations of the low are available. The conditions of the formation, development and decay of the PL are investigated using a double approach: satellite data from several instruments are used together to document the mesoscale structure of the low, and two versions of a limited‐area model are run to investigate the dynamics of the low. Numerical model fields are compared to quantities derived from TIROS‐N Operational Vertical Sounder, the Special Sensor Microwave/Imager, and satellite radar altimeter data. In spite of a better spatial resolution of the models, humidity and surface wind speeds are less organized in the simulations than in satellite retrievals. The number of vertical levels, especially for the lowest layers of the atmosphere, appears to be an essential component for a good simulation of the trajectory of the low. There is, however, good overall agreement between modelled and satellite‐derived fields, and the good quality of the simulations allows inferences to be made regarding the essential physical and dynamical processes taking place during the formation and development of the PL. We find that the PL was the result of favourable flow conditions at the surface in the form of a shallow arctic front established south of the ice edge, together with an upper‐level potential‐vorticity anomaly setting the stage for a positive interaction. Later on, the strong surface sensible‐ and latent‐heat fluxes contributed to the extensive vertical development. This study demonstrates the usefulness of the approach adopted here, which relies not only on simulations but also on observations to get a very complete description of such disturbances. Copyright © 2004 Royal ... |
format |
Article in Journal/Newspaper |
author |
Claud, Chantal Heinemann, Guenther Raustein, Elmer Mcmurdie, Lynn |
author_facet |
Claud, Chantal Heinemann, Guenther Raustein, Elmer Mcmurdie, Lynn |
author_sort |
Claud, Chantal |
title |
Polar low le Cygne : Satellite observations and numerical simulations |
title_short |
Polar low le Cygne : Satellite observations and numerical simulations |
title_full |
Polar low le Cygne : Satellite observations and numerical simulations |
title_fullStr |
Polar low le Cygne : Satellite observations and numerical simulations |
title_full_unstemmed |
Polar low le Cygne : Satellite observations and numerical simulations |
title_sort |
polar low le cygne : satellite observations and numerical simulations |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1256/qj.03.72 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1256%2Fqj.03.72 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1256/qj.03.72 |
geographic |
Arctic Norwegian Sea |
geographic_facet |
Arctic Norwegian Sea |
genre |
Arctic Norwegian Sea |
genre_facet |
Arctic Norwegian Sea |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 130, issue 598, page 1075-1102 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1256/qj.03.72 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
130 |
container_issue |
598 |
container_start_page |
1075 |
op_container_end_page |
1102 |
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1784265648524754944 |