North Atlantic weather regimes: A synoptic study of phase space
In the phase space of weather, low frequency variability (LFV) of the atmosphere can be captured in a large scale subspace, where a trajectory connects consecutive large scale weather maps, thus revealing flow changes and recurrences. Using this approach, Vautard applied the trajectory speed minimiz...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19910012360 2023-05-15T16:29:02+02:00 North Atlantic weather regimes: A synoptic study of phase space Orrhede, Anna Karin Unclassified, Unlimited, Publicly available JAN 1, 1990 application/pdf http://hdl.handle.net/2060/19910012360 unknown Document ID: 19910012360 Accession ID: 91N21673 http://hdl.handle.net/2060/19910012360 No Copyright CASI METEOROLOGY AND CLIMATOLOGY NASA-CR-188162 NAS 1.26:188162 1990 ftnasantrs 2019-07-21T09:07:21Z In the phase space of weather, low frequency variability (LFV) of the atmosphere can be captured in a large scale subspace, where a trajectory connects consecutive large scale weather maps, thus revealing flow changes and recurrences. Using this approach, Vautard applied the trajectory speed minimization method (Vautard and Legras) to atmospheric data. From 37 winters of 700 mb geopotential height anomalies over the North Atlantic and the adjacent land masses, four persistent and recurrent weather patterns, interpreted as weather regimes, were discernable: a blocking regime, a zonal regime, a Greenland anticyclone regime, and an Atlantic regime. These regimes are studied further in terms of maintenance and transitions. A regime survey unveils preferences regarding event durations and precursors for the onset or break of an event. The transition frequencies between regimes vary, and together with the transition times, suggest the existence of easier transition routes. These matters are more systematically studied using complete synoptic map sequences from a number of events. Other/Unknown Material Greenland North Atlantic NASA Technical Reports Server (NTRS) Greenland |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
METEOROLOGY AND CLIMATOLOGY |
spellingShingle |
METEOROLOGY AND CLIMATOLOGY Orrhede, Anna Karin North Atlantic weather regimes: A synoptic study of phase space |
topic_facet |
METEOROLOGY AND CLIMATOLOGY |
description |
In the phase space of weather, low frequency variability (LFV) of the atmosphere can be captured in a large scale subspace, where a trajectory connects consecutive large scale weather maps, thus revealing flow changes and recurrences. Using this approach, Vautard applied the trajectory speed minimization method (Vautard and Legras) to atmospheric data. From 37 winters of 700 mb geopotential height anomalies over the North Atlantic and the adjacent land masses, four persistent and recurrent weather patterns, interpreted as weather regimes, were discernable: a blocking regime, a zonal regime, a Greenland anticyclone regime, and an Atlantic regime. These regimes are studied further in terms of maintenance and transitions. A regime survey unveils preferences regarding event durations and precursors for the onset or break of an event. The transition frequencies between regimes vary, and together with the transition times, suggest the existence of easier transition routes. These matters are more systematically studied using complete synoptic map sequences from a number of events. |
format |
Other/Unknown Material |
author |
Orrhede, Anna Karin |
author_facet |
Orrhede, Anna Karin |
author_sort |
Orrhede, Anna Karin |
title |
North Atlantic weather regimes: A synoptic study of phase space |
title_short |
North Atlantic weather regimes: A synoptic study of phase space |
title_full |
North Atlantic weather regimes: A synoptic study of phase space |
title_fullStr |
North Atlantic weather regimes: A synoptic study of phase space |
title_full_unstemmed |
North Atlantic weather regimes: A synoptic study of phase space |
title_sort |
north atlantic weather regimes: a synoptic study of phase space |
publishDate |
1990 |
url |
http://hdl.handle.net/2060/19910012360 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
CASI |
op_relation |
Document ID: 19910012360 Accession ID: 91N21673 http://hdl.handle.net/2060/19910012360 |
op_rights |
No Copyright |
_version_ |
1766018714661027840 |