ANNUAL PRECIPITATION RECONSTRUCTION OF THE EASTERN REGION OF TLAXCALA STATE
DOI:
https://doi.org/10.29298/rmcf.v5i23.345Keywords:
Dendrochronology, ENSO, NAMS, Pinus cembroides Zucc., reconstructed precipitation, Tlaxcala stateAbstract
The ring-width index of Pinus cembroides was taken as “proxy” to reconstructed historical precipitation variability in eastern Tlaxcala region. The annual precipitation was reconstructed for 159 years (1850-2008) and indicated high inter-annual and decadal variability. The most intense droughts were reconstructed for the 1887 to 1904, 1969 to 1975, and 1982 to 1991 periods. Wet episodes occurred from 1860 to 1863, 1867 to 1876, 1905 to 1909, 1934 to 1940, 1967 to 1969, 1981 to 1982, 1992 to 1993, and 2000 to 2001. From the middle of the 20th century to the early years of 21st century, the ENSO phenomenon showed a significant influence on the precipitation variability, for intense ENSO years, in particular. Likewise, severe ENSO events were also related to the late start of NAMS, particularly for the 1970 - 1974, 1988 -1989 and 1998- 1999 periods, causing decrease in rainfall (severe droughts), a situation that affected agriculture production, which provoked an intense social and economic impact; a clear example is the severe drought of the 1970 ́s, when the interaction of both phenomena gave rise to the worst drought in the last 159 years for the eastern region of Tlaxcala state.
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