9 documents found, page 1 of 1
Influence of the Minho River plume on the Rias Baixas (NW of the iberian penins...
Sousa, M. C.; Vaz, N.; Alvarez, I.; Gomez-Gesteira, M.; Dias, J. M.The buoyancy generated by the Minho estuarine plume can flood the Rias Baixas for long periods, reversing the normal salinity gradients. Thus, the main purpose of this work was to study the propagation of Minho estuarine plume to the Rias Baixas, establishing the wind and river discharge conditions in which this plume affects the circulation and hydrography features of these coastal systems as well as the plume...
Assessment of chlorophyll variability along the northwestern coast of Iberian P...
Picado, A.; Alvarez, I.; Vaz, N.; Varela, R.; Gomez-Gesteira, M.; Dias, J. M.The northwestern coast of the Iberian Peninsula is characterized by a high primary production mainly supported by coastal upwelling, creating an extraordinary commercial interest for fisheries and aquaculture. Considering chlorophyll- a (Chl- a) as an indicator of primary production, its spatio-temporal variability was researched in this study in the surface water of this upwelling region from 1998 to 2007. Sat...
Modeling the Minho River plume intrusion into the Rias Baixas (NW Iberian Penin...
Sousa, M. C.; Vaz, N.; Alvarez, I.; Gomez-Gesteira, M.; Dias, J. M.The Minho River discharge is recognized as particularly important in driving the circulation and hydrography of Rias Baixas, which are highly productive fishery and aquaculture regions extremely sensitive to environmental characteristics. The intrusion of the Minho River plume inside these Rias can reverse the normal circulation pattern and affect the macronutrient concentrations, imposing a control on new prod...
Assessment of Wind Pattern Accuracy from the QuikSCAT Satellite and the WRF Mod...
Sousa, M. C.; Alvarez, I.; Vaz, N.; Gomez-Gesteira, M.; Dias, J. M.Surface wind along the Galician coast is a key factor allowing the analysis of important oceanographic features that are related to the great primary production in this area, as upwelling events. A comparative analysis between surface winds obtained from the Quick Scatterometer (QuikSCAT), the Weather Research and Forecasting (WRF) Model, and in situ observations from buoys along the Galician coast is carried o...
Differences in coastal and oceanic SST trends due to the strengthening of coast...
Santos, F.; Gomez-Gesteira, M.; deCastro, M.; Alvarez, I.Coastal and oceanic sea surface temperature (SST) trends were analyzed in the Benguela upwelling ecosystem from the seventies on. Monthly SST data were obtained from the UK Meteorological Office, Hadley Center at two transects in front of the Namibia coast and the western coast of South Africa. A positive SST trend (0.06 °C dec−1) is observed at open sea locations and a negative one (−0.13 °C dec−1) near shore....
Comparative analysis of upwelling influence between the western and northern co...
Alvarez, I.; Gomez-Gesteira, M.; DeCastro, M.; Lorenzo, M. N.; Crespo, A. J. C.; Dias, J. M.Upwelling conditions have been simultaneously analyzed along the western and northern coast of the Iberian Peninsula in terms of wind forcing and water temperature response. The wind forcing analysis showed that the season under more upwelling favorable conditions corresponds to spring–summer (April–September) along the western coast and only to summer (June–August) along the northern one. Taking into account t...
Effects of heat waves on human mortality, Galicia, Spain
DeCastro, M.; Gomez-Gesteira, M.; Ramos, A. M.; Álvarez, I.; DeCastro, P.Two major heat waves were identified in Galicia over the period 1987–2006. The first was detected in July 1990, and the second in August 2003. The most likely factor contributing to both heat waves was the north-eastward displacement of the Atlantic subtropical high. The effect of these heat waves on excessive mortality was assessed through the analysis of temperature means and normalized mortality exceedance o...
Poleward intrusion in the northern Galician shelf
Alvarez, I.; Ospina-Alvarez, N.; deCastro, M.; Varela, M.; Gomez-Gesteira, M.; Prego, R.The evolution of a warm water mass related to the Iberian Poleward Current (IPC) was characterized along the northern Galician shelf in November 2008 by means of Sea Surface Temperature and wind data. It was observed that under upwelling favorable conditions water temperature decreased along the northern coast and a temperature break appeared between Cape Vilano and Cape Ortegal showing a relaxation of the pole...
Summer upwelling frequency along the western Cantabrian coast from 1967 to 2007
Alvarez, I.; Gomez-Gesteira, M.; deCastro, M.; Gomez-Gesteira, J. L.; Dias, J. M.Upwelling events have been analyzed along the western part of the Cantabrian coast from 1967 to 2007. This analysis shows that the highest number of days under upwelling favorable conditions was observed from June to September (12–14 days per month) with a probability of finding consecutive days under upwelling favorable conditions decreasing from 47% to 17% when events between 1 and 5 consecutive days were con...