Influencias del ENSO en el balance de agua en el suelo y la temperatura del aire en la región pampeana (Argentina) con un analisis especial en el area de San Pedro

SCARPATI O. E., J. A. FORTE LAY, M. E. FERNANDEZ LONG Y A. D. CAPRIOLO

Desafíos del Cambio Climático y Global en Argentina

EUDEBA

Lugar: Buenos Aires; Año: 2009; p. 360 - 361

In the present paper, values of daily soil water storages were calculated for the period 1965-2004 by soil water balance according to Thornthwaite method using the daily precipitation and daily normal potential evapotranspiration calculated by Penman´s formula. ENSO events were separated according to El Niño or warm phase and La Niña or cold phase, with the remaining cases being Neutral condition The paper allows a geographic visualisation of ENSO influence over summer soil water storage and autumn soil water surplus. The scheme used for determining different ENSO phases followed the Wolter classification by employing terciles of the ranked MEI values. So during the period 1961 – 2004 there are 16 cases of El Niño, 14 cases of La Niña and the rest are Neutral. It can be said that El Niño years contribute with higher soil water storage than La Niña years. The area involving San Pedro (Buenos Aires province) presents a mean autumn soil water surplus of 75mm which changes to 125 – 150mm for warm phases and to 50mm in cold phases