13 documents found, page 1 of 2
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...
Comparison between CCMP, QuikSCAT and buoy winds along the Iberian Peninsula coast
Carvalho, D.; Rocha, A.; Gómez-Gesteira, M.; Alvarez, I.; Silva Santos, C.Ocean surface wind data derived from several QuikSCAT products and the Cross-Calibrated Multi-Platform (CCMP) project were compared to wind speed and direction measurements, in order to assess which one of these databases has higher accuracy and ability to describe the local wind regime characteristics. For this, data from QuikSCAT (swath data from L2B 25. km and L2B 12.5. km slice composites, together with gri...
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....
Analysis of chlorophyll a concentration along the Galician coast: seasonal vari...
Alvarez, I.; Lorenzo, M. N.; deCastro, M.The spatial and temporal distribution of chlorophyll a (Chl a) concentration was analysed along the Galician coast from 1998 to 2007. Sea surface temperature and Ekman transport data were also used to investigate the relationship between the ocean–atmosphere conditions and Chl a formation and variability. The west coast showed the highest Chl a concentration, with three peaks of maximum values (February, April–...
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...
The state of climate in NW Iberia
Gómez-Gesteira, M.; Gimeno, L.; deCastro, M.; Lorenzo, M. N.; Alvarez, I.; Nieto, R.; Taboada, J. J.; Crespo, A. J. C.; Ramos, A. M.; Iglesias, I.Since 1974, there has been a significant increasing trend in land and sea surface temperatures of 0.5 and 0.24°C decade–1, respectively, in the NW Iberian Peninsula. Over the same period, annual precipitation does not show any trend, although some tendencies have been detected at seasonal scales. A significant positive trend, on average of 2 cm decade–1, was also observed in sea level rise from 1943 onwards. Ek...
Evaluating QuikSCAT wind data to study wind induced coastal phenomena along the...
Sousa, M. C.; Alvarez, I.; Vaz , N.; Dias, J. M.The wind regime is studied at the Western Galician coast (NW Iberian Peninsula) using a comparative analysis of two different wind datasets: QuikSCAT satellite and meteorological data collected at stations situated near the coast. The main interest of this research is to evaluate if the wind data from QuikSCAT can be used to study wind induced coastal phenomena. These datasets allow an adequate statistical asse...