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

Abstract

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.

Age and growth of Glycymeris longior (Sowerby, 1832) clam at the southern edge of its distribution (Argentine Sea)

“…Our results suggest that G. longior has an extended growing season. Since seawater temperature at El Sótano oscillates between 10.0 and 18.2 °C [28], it is plausible that G. longior slows down growth at lower temperatures. In addition, growth breaks are observed in the shell surface at the end of the translucent increment (Fig.…”

“…(Pisces) [59] and A. purpurata [60] remained geographically restricted to the San Antonio Bay. These relictual populations survived probably due to the summer warm temperatures (18.2 °C in average) [28] that allow successful reproduction and survival of critical life stages [60]. The population of G. longior might be also a relic which persistence relies on sporadic recruitment pulses that succeed only when specific hydrological and thermal conditions concur.…”

“…b Location of the sampling area at El Sótano. SW AO South West Atlantic Ocean summer (January) at a depth of 20 m [28]. The chlorophyll-a concentrations are characterised by two peaks, one in austral autumn (April-May) and another one in spring (September) [29].…”

Aspectos poblacionales de la almeja Ameghinomya antiqua del noroeste del Golfo San Matías en el inicio de su pesquería

“…Las poblaciones de A. antiqua estudiadas (El Sótano y Playa Villarino) están situadas en la costa noroeste del Golfo San Matías (Figura 1). La zona de El Sótano (40° 54′ 53,841″ S-65° 08′ 22,757″ W) presenta circulación de agua restringida que, junto a la escasa pendiente y la amplitud de mareas (7,3 m promedio), resulta en una gran amplitud térmica entre verano e invierno (máxima 20 °C en febrero; mínima 9 °C en agosto) (Williams et al 2014). El sedimento es arenoso en áreas costeras, gradualmente mezclado con valva, grava y limo hacia profundidades mayores (Escofet et al 1977).…”