Role of precipitation and evapotranspiration in aridity changes in Argentina
Keywords:
exchanges, arid climate, seasonal variationAbstract
The geal is to quantify the contribution of precipitation and evapotranspiration to changes in aridity in Argentina during the 1961-2020 period. Monthly data of mean temperature and precipitation from the CRU 4.06 database for continental Argentina were used. Potential evapotranspiration was calculated using mean temperature with Thornthwaite's method, to then estimate the aridity index (AI) as the ratio between precipitation (P) and potential evapotranspiration (PET). The equation by Feng and Fu (2013) was used to analyze the contributions of P and PET to the change in AI. In general, areas with an increase (decrease) in P coincide with those showing increases (decreases) in AI. However, PET intensifies the decrease or attenuates the increase in AI. On an annual level, more arid climatic conditions prevail in the country during the historical period, but this characteristic varies according to the season of the year due to the seasonal cycle of the variables.
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