Historical variation and trends in storminess along the Portuguese South Coast

Type Article
Date 2011
Language English
Author(s) Almeida L. P.1, Ferreira O.1, Vousdoukas M. I.1, 4, Dodet Guillaume2, 3
Affiliation(s) 1 : Univ Algarve, CIMA, Faro, Portugal.
2 : Univ Lisbon, Fac Ciencias, P-1200 Lisbon, Portugal.
3 : Lab Natl Engn Civil, Lisbon, Portugal.
4 : Forschungszentrum Kuste, Hannover, Germany.
Source Natural Hazards And Earth System Sciences (1561-8633) (Copernicus Gesellschaft Mbh), 2011 , Vol. 11 , N. 9 , P. 2407-2417
DOI 10.5194/nhess-11-2407-2011
WOS© Times Cited 46
Note Special issue The record of marine storminess along European coastlines Editor(s): P. Ciavola and J. A. Jimenez
Abstract

This work investigates historical variation and trends in storm climate for the South Portugal region, using data from wave buoy measurements and from modelling, for the period 1952 to 2009. Several storm parameters (annual number of storms; annual number of days with storms; annual maximum and mean individual storm duration and annual 99.8th percentile of significant wave height) were used to analyse: (1) historical storminess trends; (2) storm parameter variability and relationships; and (3) historical storminess and its relationship to the North Atlantic Oscillation (NAO). No statistically significant linear increase or decrease was found in any of the storm parameters over the period of interest. The main pattern of storm characteristics and extreme wave heights is an oscillatory variability with intensity peaks every 7-8 yr, and the magnitude of recent variations is comparable with that of variations observed in the earlier parts of the record. In addition, the results reveal that the NAO index is able to explain only a small percentage of the variation in storm wave height, suggesting that more local factors may be of importance in controlling storminess in this region.

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