Soil heat exchange in Puerto Cuatreros tidal flats, Argentina.

BEIGT, D; PICCOLO MARIA CINTIA; PERILLO, GERARDO MIGUEL EDUARDO

CIENCIAS MARINAS

UNAM

Lugar: Mexico; Año: 2003 vol. 29 p. 595 - 602

0185-3880

Some interaction processes at the sediment-water and sediment-atmosphere interfaces were analyzed for each season of the year using mass aerodynamic formulas. Data were collected from Puerto Cuatreros tidal flats (Bahia Blanca estuary, Argentina) during an entire year (2000). The soil temperature was measured every 10 min by a thermistor chain at three levels below the sediment surface (-0.05, -0.15 and -0.25 m). Water and air temperatures, solar radiation and meteorological data were registered simultaneously, resulting in annual means of14.07°C (soil at -0.15 m), 13.69°C (air) and 14.51°C (water). Atmospheric and tidal conditions regulated the mudflat´s thermal behavior. The soil temperature vertical profiles showed a diurnal and semidiurnal cycle due to the influence of these factors. The diurnal thermal amplitude at -0.05 m reached 14.6°C on 20 February 2000, but only 2.8°C on 1 July 2000. Most fluctuations of sediment temperatures were observed in the first 15 em, with vertical gradients of 0.82°C crrr´ during summer. In order to obtain the soil heat capacity, the granulometric composition of a sediment column was analyzed. Soil heat fluxes during a typical summer and winter day were compared. A net heat gain in the soil was observed during the summer day (+840.6 kJ m-2) of-768.6 kJ m-2•and an inverse situation was found in winter, with a diurnal heat exchange of-768.6 kJ m-2•kJ m-2) and an inverse situation was found in winter, with a diurnal heat exchange of-768.6 kJ m-2•kJ m-2•