Environmental Characteristics of San Matías Gulf Obtained From Landsat-Tm and Etm+ Data

Gagliardini, Domingo A.; Rivas, Andrés Luján

doi:10.4067/s0717-65382004000200034

Cited by 47 publications

(78 citation statements)

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“…2a, líneas negras). En esta región, el aumento de mezcla vertical provocado por la marea genera frentes térmicos que separan durante la primavera-verano aguas estratificadas (en el interior y exterior del GSM) de aguas bien mezcladas (en la boca), detectados mediante datos satelitales (Glorioso, 1987;Gagliardini & Rivas, 2004;Romero et al, 2006). Con el fin de validar estos resultados, se realizó la comparación de valores de amplitud de la marea en 16 estaciones costeras, a partir de datos de la tabla de marea elaborada por el Servicio de Hidrografía Naval Argentino (Fig.…”

Section: Modelo Forzado Por Mareaunclassified

“…El experimento con vientos de Oeste mostró una circulación media que divide al GN meridionalmente en dos giros: uno anticiclónico al Oeste y otro ciclónico al NE. La circulación media en el GSJ ha sido menos estudiada, pero recientemente el análisis de datos de sensores remotos indicó que también estaría dividido meridionalmente en dos dominios con aguas de diferentes características termohalinas (Amoroso & Gagliardini, 2010;Gagliardini & Rivas, 2004). Recientemente, Tonini et al (2006) estudiaron la circulación barotrópica sobre un amplio sector de la Plataforma Continental Argentina que incluye a los golfos norpatagónicos empleando el Princeton Ocean Model (POM, Blumberg & Mellor, 1987).…”

Section: Introductionunclassified

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Respuesta barotropica de los golfos norpatagonicos argentinos forzados por mareas y vientos

Tonini

Palma

2011

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RESUMEN.En este trabajo se presentan los resultados de un modelo hidrodinámico barotrópico de alta resolución no-lineal tridimensional para examinar la respuesta de los golfos norpatagónicos argentinos, San Matías (GSM), Nuevo (GN) y San José (GSJ), ante forzante de marea y patrones idealizados de viento superficial. La estructura de la circulación inducida por el viento predominante (Oeste) en los tres golfos consiste en dos giros independientes: uno anticiclónico en el Oeste con una corriente costera más intensa que fluye hacia el sur y un retorno más débil por el centro de los golfos y otro giro ciclónico en el Este, que establece la conexión con la Plataforma en el caso del GSM. El GN y GSJ tienen la comunicación con el exterior muy restringida. La inclusión de efectos disipativos producidos por la marea reduce la intensidad de los giros, pero la estructura espacial de la circulación permanece. Si se incrementa la magnitud del viento se intensifican principalmente los giros anticiclónicos y el transporte de intercambio en la boca del GSM y se profundiza la capa superficial de Ekman. En los experimentos forzados con vientos meridionales la circulación media se divide en dos giros cuyo sentido de circulación depende de la dirección del viento: un giro Norte ciclónico (anticiclónico) y un giro Sur anticiclónico (ciclónico) para vientos del Sur (Norte). Cuando los golfos son forzados simultáneamente por marea y vientos, las corrientes residuales de marea dominan la circulación media y contribuyen a un mayor aislamiento dinámico de los mismos con la plataforma exterior. Palabras clave: simulación numérica, circulación oceánica, modelo barotrópico, forzante de viento, giros de circulación, golfos norpatagónicos, Argentina. Barotropic response of north Patagonian gulfs in Argentina to tidal and wind forcingABSTRACT. This work presents the results of a high resolution three dimensional non-linear barotropic hydrodynamic model used to examine the response of three north Patagonian gulfs in Argentina (San Matías, SMG; Nuevo, NG; and San José, SJG) forced by tides and idealized patterns of surface winds. The structure of the circulation induced by the dominant winds (Westerly) in all three gulfs consists of two independent gyres: one anticyclonic gyre in the west with an intense southward coastal flow and weaker return flow in the middle of the gulfs and one cyclonic gyre in the east that, in the SMG's case, connects with the shelf. The other two gulfs (NG and SJG) have much more restricted connections with the exterior. The inclusion of tidal dissipation effects reduces the intensity of the gyres, but the general spatial pattern of the circulation remains. Increasing the wind magnitude mainly intensifies the anticyclonic gyre and the cross-shelf transport through the SMG mouth and deepens the surface Ekman layer. If the gulfs are forced with meridional winds, the circulation splits into two gyres whose sense of circulation depends on the wind direction: a northern cyclonic (anticyclonic) gyre and a southern anticyclon...

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Section: Modelo Forzado Por Mareaunclassified

Section: Introductionunclassified

Respuesta barotropica de los golfos norpatagonicos argentinos forzados por mareas y vientos

Tonini

Palma

2011

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“…Thus, the gulf is separated from the continental shelf and shows two regions with water masses of different SST, being the northern area more isolated than the southern one. SST satellite data showed an average difference of 1-3°C between the northern and the southern areas, except during winter when the thermal front vanishes and the SST distribution is spatially homogeneous Gagliardini & Rivas, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…1a). This thermal front has been also observed using Thematic Mapper (TM), Enhanced Thematic Mapper plus (ETM+) and AVHRR infrared data Bava et al, 2002;Gagliardini & Rivas, 2004;Williams, 2011). Thus, the gulf is separated from the continental shelf and shows two regions with water masses of different SST, being the northern area more isolated than the southern one.…”

Section: Introductionmentioning

confidence: 99%

Comparison between remotely sensed sea surface temperature (AVHRR) and in situ records in San Matias Gulf, Patagonia, Argentina

Williams¹,

Zaidman²,

Glembocki³

et al. 2014

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ABSTRACT.In situ records of sea surface temperature collected between 2005 and 2009 were used to compare, for the first time, the temperature estimated by the Multichannel algorithms (MCSST) of the Advanced Very High Resolution Radiometer (AVHRR) sensors in San Matías Gulf, in the north of the Argentinean Patagonian Continental Shelf (between 40º47'-42º13'S). Match-ups between in situ records and satellite sea surface temperature (SST) were analyzed. In situ records came from fixed stations and oceanographic cruises, while satellite data came from different NOAA satellites. The fitting of temperature data to a Standard Major Axis (SMA) type II regression model indicated that a high proportion of the total variance (0.53≤ r 2 ≤0.99) was explained by this model showing a high correlation between in situ data and satellite estimations. The mean differences between satellite and in situ data for the full data set were 1.64 ± 1.49ºC. Looking separately into in situ data from different sources and day and night estimates from different NOAA satellites, the differences were between 0.30 ± 0.60°C and 2.60 ± 1.50°C. In this paper we discuss possible reasons for the above-mentioned performance of the MCSST algorithms in the study area.

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“…The San Matías Gulf (SMG) (41-42ºS, 64-65ºW) ( Figure 1) is a semienclosed basin with relatively isolated waters separated from the adjacent continental shelf by an 80 m-deep sill and constitutes a particular ecosystem of Northern Patagonia (RIVAS and BEIER, 1990;GAGLIARDINI and RIVAS, 2004;). An industrial bottom trawl fishery has been developed in , 1986-2011. the SMG waters since 1971 (DI GIÁCOMO and PERIER, 1992), which operates in the port of San Antonio Oeste.…”

Section: Introductionmentioning

confidence: 99%

Standardized catch rate of cockfish, Callorhinchus callorynchus, in a bottom trawl fishery of Patagonia: Is it possible its use as a predictor of abundance trend?

2015

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Standardized catch rate of cockfish, Callorhinchus callorynchus, in a bottom trawl fishery of Patagonia: Is it possible its use as a predictor of abundance trend?The catch per unit of effort (CPUE) data of cockfish, Callorhinchus callorynchus, during 1986-2011 was evaluated for the bottom trawl fishery of the San Matías gulf (Patagonia, Argentina). The objective of this work was to detect what are the factors related to fishery dynamic that affect catch rate of cockfish and to assess standardized CPUE by General linear models (GLMs) and General linear mixed models (GLMMs) as a relative abundance index. The annual trend of the catch rate indicated an increase during the evaluated period. The nominal CPUE and the indices standardized by the Delta-GLM and Delta-GLMM showed the same annual trend, with increases of 57%, 61.1% and 60.7%, respectively. The LogNormal models have the best-fit model and explained 23.5% of the total variability. The factors year, month, depth and hake CPUE explained the highest variability. The analysis of the models indicated that the catch rate of cockfish is subject to the lack of an homogeneous distribution of the fishing effort during different years, months and vessels. This was related to the fleet dynamic searching the targets species. The increasing trend of CPUE and landings would be indicating an increase in effort directionality to the cockfish in the last decade. Descriptors: Standardized CPUE, Holocephali, Chondrichtyans bycatch, GLM, GLMM, Chimaeroids. AbstrActDados de captura por unidade de esforço (CPUE) do peixe-galo Callorhinchus callorynchus foram avaliados para a pesca de arrasto de fundo no Golfo de San Matías (Patagonia, Argentina), durante o período 1986-2011. Os objetivos do trabalho foram identificar quais os fatores relacionados à dinâmica pesqueira que afetam a taxa de captura do peixe-galo e verificar a viabilidade em utilizar dados de CPUEs padronizadas pelos Modelos Lineares Gerais (GLM) e Modelos Lineares Gerais Mistos (GLMMs) como índices de abundância relativa. A tendência anual da taxa de captura indicou um aumento durante o período avaliado. A CPUE nominal e os índices padronizados pelo Delta-GLM e Delta-GLMM apresentaram a mesma tendência anual, com aumentos de 57%, 61.1% e 60.7%, respectivamente. Os modelos LogNormal foram os de melhor ajuste e explicaram 23,5% da variabilidade total dos dados. Ano, mês, profundidade e "hake" CPUE foram os fatores mais explicativos. A análise dos modelos indicou que a taxa de captura do peixe-galo está ligada à falta de distribuição homogênea do esforço de pesca durante os diferentes anos, meses e navios. Este fato esteve relacionado à dinâmica das frotas na busca das espécies alvo. A tendência crescente no aumento das CPUE e descargas em terra estaria indicando a mudança do esforço de pesca direcionado ao peixe-galo na última década.

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Environmental Characteristics of San Matías Gulf Obtained From Landsat-Tm and Etm+ Data

Cited by 47 publications

References 0 publications

Respuesta barotropica de los golfos norpatagonicos argentinos forzados por mareas y vientos

Respuesta barotropica de los golfos norpatagonicos argentinos forzados por mareas y vientos

Comparison between remotely sensed sea surface temperature (AVHRR) and in situ records in San Matias Gulf, Patagonia, Argentina

Standardized catch rate of cockfish, Callorhinchus callorynchus, in a bottom trawl fishery of Patagonia: Is it possible its use as a predictor of abundance trend?

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