Exploiting oceanographic satellite data to study the small scale coastal dynamics in a NE Atlantic open embayment

12/05/11 ,

An approach to the processing and analysis of oceanographic satellite data is presented suitable for its use in coastal areas. Satellite images of a small (300 km2) open embayment in the NW of the Iberian Peninsula (Seno de Corcubión) are used to study a decade of time series of three important oceanographic variables: sea surface temperature (SST), chlorophyll a concentration ([Chlo]) and turbidity (K490). Their interannual and seasonal trends, together with the regional variability, are assessed using a Generalized Linear Model (GLM).

We identify seasonal upwelling–downwelling processes, on top of interannual trends that show that coastal dynamics is not directly driven by the oceanic trend. To study spatial patterns the study area was divided in subareas; these subareas show significant differences among them in seasonal as well as in interannual scales.

Using this information, some oceanographic hypotheses were tested based on the statistical significance of the variable residual dependencies: a possible relationship between SST and turbidity (found to be not significant in the study area), and the presence of short-term upwelling events reported by other researchers in this geographical region (not found statistically signi?cant either). A database and an ceanographic atlas summarizing all the information used in the analyses have been generated and can be reely visualized online and downloaded.

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EasySIG: Sistema de información geográfica sencillo

28/03/11 ,

Acabamos de subir a la sección de descargas el programa EasySIG.

Este programa es un sistema de información geográfica muy sencillo, que se ha sido desarrollado partiendo del código de gvSIG v. 1.1.2 (www.gvsig.org), sextante (www.sextantegis.org) y la aplicación para dispositivos GPS desarrollada por la Junta de Castilla y León (www.iver.es).

Easy SIG

EasySIG se ha desarrollado pensando en usuarios ajenos a los SIG, para poner a su disposición una herramienta sencilla que permita la visualización y edición más sencilla de la información geográfica. EasySIG permite además importar y exportar información directamente de dispositivos GPS (Garmin) así como generar archivos .kmz para GoogleEarth.

En la página de descargas podeis encontrar los archivos de instalación para windows y linux. Además el programa cuenta con un archivo de ayuda que puede facilitar el comienzo del trabajo. Esperamos os sea útil.

IUCN Red List Workshop for Tunas and Billfishes

02/03/11 ,

From Feb. 15-18, 17 marine fishery biologists from four countries (US, Japan, Spain, and Brazil) met at the International Game Fish Foundation in Fort Lauderdale, FL in an International Union for the Conservation of Nature Red List Workshop to integrate previous assessments of the threat status to 18 species of tunas and billfishes. These species had been evaluated at previous IUCN Red List workshops in Lima, Peru; Taipei, Taiwan; and Brasilia, Brazil. Half of them were widespread species that needed to have the results of the regional workshop evaluations combined to produce a global threat assessment, the other half were species that needed additional review due to acquisition of new data. Draft evaluations have now been completed for the 64 species in four families: Scombridae (tunas and mackerels),Istiophoridae (billfishes), Xiphiidae (swordfish), and Coryphaenidae (dolphinfishes). Preliminary conclusions are that two thirds of the species are of Least Concern, 19% do not yet have sufficient data for adequate conclusions, and 17% are under some degree of threat. Final results will be published on the IUCN Red List this fall after peer review of the draft results. Bruce B. Collette, Chair, IUCN Tuna and Billfish Specialist Group.

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