Índices de cambio climático en la cuenca del Río Grande, Chiapas, México

The World Meteorological Organization and the Expert Team on Climate Change Detection and Indices have proposed 27 indicators to detect and monitor changes in climate extremes. These indices were calculated based on a series of observed temperature data (maximum and minimum) and precipitation over a period of more than 50 years at three weather stations located in the Rio Grande basin in Chiapas, Mexico. At two stations, 27 of the climate indices defined by the ETCCDI were found to have had the same statistically significant trends, six of which were related to air temperature. Both stations presented increasing trends in summer days (SU25), maximum extremes (TXx), frequency of warm days (Tx90p), and daytime temperature ranges (DTR), and negative trends (decreases) in the frequency of cold days (Tx10p) and cold nights (Tn10p). It can therefore be concluded that the minimum and maximum temperatures present a significant upward trend.