Publication: Analysis of Wet and Dry Periods in the Central Andes of Peru during the Rainy Season between 1965 and 2012.
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Web: ... ISSN:
Year: 2014 ISBN:
Language: Inglés External Link: ...
Type: Abstract
The characterization of dry and wet periods in the central Andes of Peru has been evaluated with indices SPI (Standardized Precipitation Index) and SPEI (Standardised Precipitation-Evapotranspiration Index (SPEI)). To calculate the SPI has worked with monthly rainfall series for the period 1965 to 2012 in 40 stations distributed in the basins of the Rio Chillon, Rimac, Lurin and the top of the Rio Mantaro, while assessing SPEI was used gridded data to a horizontal resolution of 0.5 ° x0.5 ° (50km x 50km) web portal Global Drought Monitor (V. Serrano et al., 2010). The time scale analyzed in both cases is three months (SPI-3): January, February and March, characterized by recording the maximum accumulated rainfall period. SPI calculations with observed precipitation data have identified the dry and wet periods, and even determine the extremely dry years (less than or equal to -2.0 SPI), extremely wet years (greater than or equal to 2.0 + SPI) and years normal (between -0.99 and +0.99 SPI) in the four study basins. The years identified with the SPI as extremely dry and extremely wet have been evaluated with SPEI as a complementary tool to spatial analysis in the study area. The results indicate an increased frequency of droughts with moderate to extreme categories (SPI between +1.49 and greater than +2.0) during the years 1992, 1990 and 1968, while the higher frequency of wet periods with moderate to extreme categories (SPI between -1.49 and less than -2.0) between 1984 and 1967. In conclusion, the SPI and SPEI allow the identification and monitoring of dry and wet events in the Central Andes of Peru
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