The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis
Waves in the North Atlantic are strongly seasonal, and peak in the winter season. The west coast of Portugal is exposed to winter swell, generated by wind associated with North Atlantic extratropical cyclones. The track of these storms, generated near the North America east coast, is strongly influe...
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ftdtic:ADA432981 2023-05-15T17:26:25+02:00 The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis Semedo, Alvaro A. NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY 2005-03 text/html http://www.dtic.mil/docs/citations/ADA432981 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA432981 en eng http://www.dtic.mil/docs/citations/ADA432981 Approved for public release; distribution is unlimited., Availability: This document is not available from DTIC in microfiche. DTIC AND NTIS Physical and Dynamic Oceanography Geography Mechanics *OCEAN WAVES *STORMS *OSCILLATION *NORTH ATLANTIC OCEAN EUROPE COASTAL REGIONS WIND PATHS TRACKING THESES WINTER CYCLONES ISLANDS NORTH AMERICA EAST(DIRECTION) BUOYS PORTUGAL WESTERN EUROPE IBERIAN PENINSULA UNITED KINGDOM NORTH ATLANTIC OSCILLATION Text 2005 ftdtic 2016-02-21T10:32:02Z Waves in the North Atlantic are strongly seasonal, and peak in the winter season. The west coast of Portugal is exposed to winter swell, generated by wind associated with North Atlantic extratropical cyclones. The track of these storms, generated near the North America east coast, is strongly influenced by the North Atlantic Oscillation (NAO). When the NAO is in its positive phase they normally track northeast and reach Western Europe well north of the Iberian Peninsula, in the British Islands or Scandinavia. However, in the negative NAO situation, the track of the storms is more zonal and south than usual, due to a weakened NAO. The characteristics of wave regime in Portugal are shown to be strongly related to the NAO phase and corresponding storm tracking. Positive NAO storms, tracking northeast towards the north of Europe, drive longer period swell from the northwest, whereas negative NAO storms have associated shorter period swell arriving to Portugal from a more westerly direction. The relation between the NAO phase and the storm tracks and the characteristics of the wave regime is investigated with ten year observations from four directional waverider coastal buoys, located off the coast of Portugal. The original document contains color images. Text North Atlantic North Atlantic oscillation Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Physical and Dynamic Oceanography Geography Mechanics *OCEAN WAVES *STORMS *OSCILLATION *NORTH ATLANTIC OCEAN EUROPE COASTAL REGIONS WIND PATHS TRACKING THESES WINTER CYCLONES ISLANDS NORTH AMERICA EAST(DIRECTION) BUOYS PORTUGAL WESTERN EUROPE IBERIAN PENINSULA UNITED KINGDOM NORTH ATLANTIC OSCILLATION |
spellingShingle |
Physical and Dynamic Oceanography Geography Mechanics *OCEAN WAVES *STORMS *OSCILLATION *NORTH ATLANTIC OCEAN EUROPE COASTAL REGIONS WIND PATHS TRACKING THESES WINTER CYCLONES ISLANDS NORTH AMERICA EAST(DIRECTION) BUOYS PORTUGAL WESTERN EUROPE IBERIAN PENINSULA UNITED KINGDOM NORTH ATLANTIC OSCILLATION Semedo, Alvaro A. The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis |
topic_facet |
Physical and Dynamic Oceanography Geography Mechanics *OCEAN WAVES *STORMS *OSCILLATION *NORTH ATLANTIC OCEAN EUROPE COASTAL REGIONS WIND PATHS TRACKING THESES WINTER CYCLONES ISLANDS NORTH AMERICA EAST(DIRECTION) BUOYS PORTUGAL WESTERN EUROPE IBERIAN PENINSULA UNITED KINGDOM NORTH ATLANTIC OSCILLATION |
description |
Waves in the North Atlantic are strongly seasonal, and peak in the winter season. The west coast of Portugal is exposed to winter swell, generated by wind associated with North Atlantic extratropical cyclones. The track of these storms, generated near the North America east coast, is strongly influenced by the North Atlantic Oscillation (NAO). When the NAO is in its positive phase they normally track northeast and reach Western Europe well north of the Iberian Peninsula, in the British Islands or Scandinavia. However, in the negative NAO situation, the track of the storms is more zonal and south than usual, due to a weakened NAO. The characteristics of wave regime in Portugal are shown to be strongly related to the NAO phase and corresponding storm tracking. Positive NAO storms, tracking northeast towards the north of Europe, drive longer period swell from the northwest, whereas negative NAO storms have associated shorter period swell arriving to Portugal from a more westerly direction. The relation between the NAO phase and the storm tracks and the characteristics of the wave regime is investigated with ten year observations from four directional waverider coastal buoys, located off the coast of Portugal. The original document contains color images. |
author2 |
NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY |
format |
Text |
author |
Semedo, Alvaro A. |
author_facet |
Semedo, Alvaro A. |
author_sort |
Semedo, Alvaro A. |
title |
The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis |
title_short |
The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis |
title_full |
The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis |
title_fullStr |
The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis |
title_full_unstemmed |
The North Atlantic Oscillation Influence on the Wave Regime in Portugal: An Extreme Wave Event Analysis |
title_sort |
north atlantic oscillation influence on the wave regime in portugal: an extreme wave event analysis |
publishDate |
2005 |
url |
http://www.dtic.mil/docs/citations/ADA432981 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA432981 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA432981 |
op_rights |
Approved for public release; distribution is unlimited., Availability: This document is not available from DTIC in microfiche. |
_version_ |
1766118080920944640 |