On the development of strong ridge episodes over the eastern North Atlantic
The occurrence of strong and persistent mid-latitude anticyclonic ridges over the Eastern North Atlantic is a major contributor to the occurrence of severe winter droughts over Western Iberia. We analyze the development of strong and persistent ridge episodes within 40–50°N; 40°W–5°E, which are defi...
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American Geophysical Union
2009
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ftunivreading:oai:centaur.reading.ac.uk:32779 2023-09-05T13:21:21+02:00 On the development of strong ridge episodes over the eastern North Atlantic Santos, João A. Pinto, Joaquim G. Ulbrich, Uwe 2009 text https://centaur.reading.ac.uk/32779/ https://centaur.reading.ac.uk/32779/1/grl26148.pdf https://doi.org/10.1029/2009GL039086 en eng American Geophysical Union https://centaur.reading.ac.uk/32779/1/grl26148.pdf Santos, João A., Pinto, Joaquim G. and Ulbrich, Uwe (2009) On the development of strong ridge episodes over the eastern North Atlantic. Geophysical Research Letters, 36 (17). L17804. ISSN 0094-8276 doi: https://doi.org/10.1029/2009GL039086 <https://doi.org/10.1029/2009GL039086> Article PeerReviewed 2009 ftunivreading https://doi.org/10.1029/2009GL039086 2023-08-14T17:52:29Z The occurrence of strong and persistent mid-latitude anticyclonic ridges over the Eastern North Atlantic is a major contributor to the occurrence of severe winter droughts over Western Iberia. We analyze the development of strong and persistent ridge episodes within 40–50°N; 40°W–5°E, which are defined as 300 hPa geopotential height anomalies above 50 gpm that persist for at least 10 consecutive days. Results suggest that the generation and maintenance of these episodes, with positive stratospheric geopotential anomalies over the North American continent and the adjacent North Pacific, are associated with an intensified polar jet. Such positive anomalies tend to detach from the main stratospheric anomaly and propagate eastwards and downwards as Rossby tropospheric waves. Furthermore, the Eastern North Atlantic ridge is generated and repeatedly reinforced until the stratospheric anomaly dissipates. Results also show evidence for waves breaking anticyclonically during the episodes, which is dynamically coherent with their persistency and quasi-stationarity. Article in Journal/Newspaper North Atlantic CentAUR: Central Archive at the University of Reading Pacific Geophysical Research Letters 36 17 |
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Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
English |
description |
The occurrence of strong and persistent mid-latitude anticyclonic ridges over the Eastern North Atlantic is a major contributor to the occurrence of severe winter droughts over Western Iberia. We analyze the development of strong and persistent ridge episodes within 40–50°N; 40°W–5°E, which are defined as 300 hPa geopotential height anomalies above 50 gpm that persist for at least 10 consecutive days. Results suggest that the generation and maintenance of these episodes, with positive stratospheric geopotential anomalies over the North American continent and the adjacent North Pacific, are associated with an intensified polar jet. Such positive anomalies tend to detach from the main stratospheric anomaly and propagate eastwards and downwards as Rossby tropospheric waves. Furthermore, the Eastern North Atlantic ridge is generated and repeatedly reinforced until the stratospheric anomaly dissipates. Results also show evidence for waves breaking anticyclonically during the episodes, which is dynamically coherent with their persistency and quasi-stationarity. |
format |
Article in Journal/Newspaper |
author |
Santos, João A. Pinto, Joaquim G. Ulbrich, Uwe |
spellingShingle |
Santos, João A. Pinto, Joaquim G. Ulbrich, Uwe On the development of strong ridge episodes over the eastern North Atlantic |
author_facet |
Santos, João A. Pinto, Joaquim G. Ulbrich, Uwe |
author_sort |
Santos, João A. |
title |
On the development of strong ridge episodes over the eastern North Atlantic |
title_short |
On the development of strong ridge episodes over the eastern North Atlantic |
title_full |
On the development of strong ridge episodes over the eastern North Atlantic |
title_fullStr |
On the development of strong ridge episodes over the eastern North Atlantic |
title_full_unstemmed |
On the development of strong ridge episodes over the eastern North Atlantic |
title_sort |
on the development of strong ridge episodes over the eastern north atlantic |
publisher |
American Geophysical Union |
publishDate |
2009 |
url |
https://centaur.reading.ac.uk/32779/ https://centaur.reading.ac.uk/32779/1/grl26148.pdf https://doi.org/10.1029/2009GL039086 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://centaur.reading.ac.uk/32779/1/grl26148.pdf Santos, João A., Pinto, Joaquim G. and Ulbrich, Uwe (2009) On the development of strong ridge episodes over the eastern North Atlantic. Geophysical Research Letters, 36 (17). L17804. ISSN 0094-8276 doi: https://doi.org/10.1029/2009GL039086 <https://doi.org/10.1029/2009GL039086> |
op_doi |
https://doi.org/10.1029/2009GL039086 |
container_title |
Geophysical Research Letters |
container_volume |
36 |
container_issue |
17 |
_version_ |
1776201969586667520 |