Upper-ocean circulation patterns in the northern Gulf of California, expressed in Ers-2 Synthetic Aperture Radar Imagery
ERS-2 Synthetic Aperture Radar (SAR) frames were collected over the northern Gulf of California during winter 1999. The frames, presented here as a single composite image (100 x 300 km), express a mesoscale meander or eddy-like feature, approximately 80 km wide, located close to the peninsula of Baj...
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Iniversidad Autónoma de Baja California
2001
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oai:cienciasmarinas.com.mx:article-4652019-05-08T23:46:20Z Upper-ocean circulation patterns in the northern Gulf of California, expressed in Ers-2 Synthetic Aperture Radar Imagery Patrones de circulación en la capa superior del océano en la parte norte del Golfo de California, expresados en imágenes del Radar de Apertura Sintética del Ers-2 Martínez-Díaz-León, A Synthetic Aperture Radar ocean circulation northern Gulf of California Radar de Apertura Sintética circulación oceánica norte del Golfo de California. ERS-2 Synthetic Aperture Radar (SAR) frames were collected over the northern Gulf of California during winter 1999. The frames, presented here as a single composite image (100 x 300 km), express a mesoscale meander or eddy-like feature, approximately 80 km wide, located close to the peninsula of Baja California. The eddy is expressed as bright, concentric bands that curve in an anticyclonic direction. The location and dimensions of the eddy are in very good agreement with the winter circulation of the northern Gulf of California described by Lavín et al. (1997), from the analysis of direct observations using satellite-tracked drifters and hydrographic surveys. The SAR image also depicts other smaller, cyclonic eddy-like features, located close to the mainland, which may be associated with the general circulation induced by the anticyclonic eddy. SAR images, together with the reduced number of in situ observations, can provide new and valuable information about the mesoscale circulation of the upper ocean in the Gulf of California, even when cloud cover prevents the use of other remote sensors, such as infrared radiometers and visible imaging systems. Se tomaron cuadros del Radar de Apertura Sintética (SAR) a bordo del ERS-2 sobre la parte norte del Golfo de California durante el invierno de 1999. Estos cuadros, presentados aquí como una imagen compuesta (100 x 300 km), expresan un meandro o giro de aproximadamente 80 km de diámetro localizado cerca de la península de Baja California. Este giro se aprecia en forma de bandas brillantes concéntricas que se curvan en sentido anticiclónico. La localización y dimensiones del giro concuerdan bien con la circulación invernal en la parte norte del Golfo de California descrita por Lavín et al. (1997), a partir del análisis de observaciones directas mediante el uso de boyas de deriva rastreadas por satélite y por lances hidrográficos. La imagen del SAR muestra también otros giros ciclónicos más pequeños localizados cerca del continente que pudieran estar asociados con la circulación general inducida por el giro anticiclónico. Se concluye que las imágenes del SAR, junto con el reducido número de observaciones in situ, pueden proporcionar información nueva y valiosa acerca de la circulación de mesoescala de la capa superior del océano en el Golfo de California, aun cuando las condiciones de nubosidad pudieran no permitir el uso de otros tipos de sensores remotos, tales como radiómetros que operen en el infrarrojo o sistemas ópticos que operen en el visible. Iniversidad Autónoma de Baja California 2001-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/465 10.7773/cm.v27i2.465 Ciencias Marinas; Vol. 27 No. 2 (2001); 209-221 Ciencias Marinas; Vol. 27 Núm. 2 (2001); 209-221 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/465/404 |
| institution |
Ciencias Marinas |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Martínez-Díaz-León, A |
| spellingShingle |
Martínez-Díaz-León, A Upper-ocean circulation patterns in the northern Gulf of California, expressed in Ers-2 Synthetic Aperture Radar Imagery |
| author_facet |
Martínez-Díaz-León, A |
| author_sort |
Martínez-Díaz-León, A |
| title |
Upper-ocean circulation patterns in the northern Gulf of California, expressed in Ers-2 Synthetic Aperture Radar Imagery |
| title_short |
Upper-ocean circulation patterns in the northern Gulf of California, expressed in Ers-2 Synthetic Aperture Radar Imagery |
| title_full |
Upper-ocean circulation patterns in the northern Gulf of California, expressed in Ers-2 Synthetic Aperture Radar Imagery |
| title_fullStr |
Upper-ocean circulation patterns in the northern Gulf of California, expressed in Ers-2 Synthetic Aperture Radar Imagery |
| title_full_unstemmed |
Upper-ocean circulation patterns in the northern Gulf of California, expressed in Ers-2 Synthetic Aperture Radar Imagery |
| title_sort |
upper-ocean circulation patterns in the northern gulf of california, expressed in ers-2 synthetic aperture radar imagery |
| description |
ERS-2 Synthetic Aperture Radar (SAR) frames were collected over the northern Gulf of California during winter 1999. The frames, presented here as a single composite image (100 x 300 km), express a mesoscale meander or eddy-like feature, approximately 80 km wide, located close to the peninsula of Baja California. The eddy is expressed as bright, concentric bands that curve in an anticyclonic direction. The location and dimensions of the eddy are in very good agreement with the winter circulation of the northern Gulf of California described by Lavín et al. (1997), from the analysis of direct observations using satellite-tracked drifters and hydrographic surveys. The SAR image also depicts other smaller, cyclonic eddy-like features, located close to the mainland, which may be associated with the general circulation induced by the anticyclonic eddy. SAR images, together with the reduced number of in situ observations, can provide new and valuable information about the mesoscale circulation of the upper ocean in the Gulf of California, even when cloud cover prevents the use of other remote sensors, such as infrared radiometers and visible imaging systems. |
| publisher |
Iniversidad Autónoma de Baja California |
| publishDate |
2001 |
| url |
https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/465 |
| _version_ |
1715723971628892160 |
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