THE WATER REGIME OF RS DURING THE EL NIÑO-SOUTHERN OSCILLATION (ENSO )EVENTS OF THE YEARS 1987 AND 1999
DOI:
https://doi.org/10.5902/2179460X12874Keywords:
Water balance, El Niño-Southern Oscillation, rainfall anomalies.Abstract
In this work were determined and analyzed the seasonal water balance (WB) anomalies for 1987 and 1999 in relation to the Rio Grande do Sul (RS) climatic WB in the period from 1977 to 2006 to evaluate the El Niño (EN) 1987 and La Niña (LN) 1999 impact in the RS water regime, detecting periods and regions with excess or deficit of water. To calculate the WB were used air temperature and rainfall data, obtained from the National Institute of Meteorology. The water balances were calculated by Thornthwaite and Mather method, and evapotranspiration by the Thornthwaite method. The results showed that El Niño-Southern Oscillation (ENSO) affected the water regime of the analyzed years. The 1987 year was wetter than normal in most the RS, except in the extreme south the state where it was found negative precipitation anomalies and deficit of water, due to the occurrence of EN. On the other hand, 1999 was a year drier than the climatology from 1977 to 2006, due to the occurrence of LN. Excess of water observed in 1999 were registered on RS north and northwest regions.
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