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Texas A&M University (2020)

Trends in Hydrometeorological Variables with Consideration of Climate Change in Aguascalientes, Mexico

Ruiz Alvarez, Osias

Titre : Trends in Hydrometeorological Variables with Consideration of Climate Change in Aguascalientes, Mexico

Auteur : Ruiz Alvarez, Osias

Université de soutenance : Texas A&M University

Grade : Doctor of Philosophy (PhD) 2020

Résumé partiel
The main goals of this dissertation were to determine the trend of monthly evaporation, study the trend in extreme temperature indices, analyze trends in extreme precipitation indices, and explain the implications of trends in hydrometeorological variables in Aguascalientes’ agriculture. Daily evaporation, daily maximum and minimum temperature, daily precipitation data, and bibliographic references of agricultural statistics and published works on the adaptation of the crop to the environment were used. Sixteen/eleven extreme temperature/precipitation indices were estimated, and their trends were evaluated with the Mann-Kendall test. In all cases, the rate of change was obtained with the Theil-Sen estimator. In evaporation, significant trends (p ≤ 0.05) were obtained in 107-time series, from which 88 were negative, and 19 were positive. It decreased, in January and from March to December in the north ; from January to March, August, September, November and December in the center ; from February to November in the northwest ; from March to August, October, and November in the east ; from January to July, and from September to December in the South ; and in January, March, June, July, and from September to November in the southwest. It increased in April in the north ; in May, November and December in the center ; in March, November, and December in the east ; in February, April, May, October, and November in the south ; and from February to April, November, and December in the southwest. It is perceived cooling due to the decrease in TNMean, TNx, TNn ; and for the increase in FD0, TN10p, and CSDI. This increases the vulnerability of crops to damages caused by frost and germination declining in crops, such as corn, poblano pepper, and beans ; in alfalfa, the winter growth is stopped ; and in guava, greater time is required to get heat requirements and maturity. Also was observed warming caused by the increase in TXMean, SU25, TXx, TXn, TX90p, TN90p, and WSDI. This causes a faster accumulation of heat requirements, increases populations of insects and their life cycle durations ; agriculture turns vulnerable to damages, such as slow growth, poor development, and low yields in crops, such as corn, poblano pepper, beans, sorghum, oat, and alfalfa ; in grapevine and peaches, damages caused by cold declination can occur.

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Page publiée le 24 mai 2021