Abstract
The study area is located between the cities of Comitan (16°10'43"N and 92°04'20''W) a city with 150,000 inhabitants and La Esperanza (16°9'15''N and 91°52'5''W) a town with 3000 inhabitants. Both weather stations are 30 km from each other in the Chiapas State, México. 54 years of daily records of the series of maximum (tmax) and minimum temperatures (tmin) of the weather station 07205 Comitan that is on top of a house and 30 years of daily records of the weather station 07374 La Esperanza were analyzed. The objective is to analyze the evidence of climate change in the Comitan valley. 2.07% and 19.04% of missing data were filled, respectively, with the WS method. In order to verify homogeneity three methods were used: Standard Normal Homogeneity Test (SNHT), the Von Neumann method and the Buishand method. The heterogeneous series were homogenized using climatol. The trends of tmax and tmin for both weather stations were analyzed by simple linear regression, Sperman’s rho and Mann-Kendall tests. The Mann-Kendal test method confirmed the warming trend at the Comitan station for both variables with ZMK statistic values equal to 1.57 (statistically not significant) and 4.64 (statistically significant). However, for the Esperanza station, it determined a cooling trend for tmin and a slight non-significant warming for tmax with a ZMK statistic of -2.27 (statistically significant) and 1.16 (statistically not significant), for a significance level α = 0.05.
Highlights
The study area is located between the cities of Comitan (16 ̊10'43"N and 92 ̊04'20''W) a city with 150,000 inhabitants and La Esperanza (16 ̊9'15''N and 91 ̊52'5''W) a town with 3000 inhabitants
The maximum and minimum temperature series, tmax and tmin, were studied for weather stations 07205 Comitan and 07374 La Esperanza located in the DTT 011 Margaritas-Comitan in the hydrological region (HR) Grijalva-Usumacinta which have a registry of 54 and 30 years, respectively
Because the series had 2.07% and 19.04% of missing information, they were filled with the Weather Service (WS) method
Summary
The study area is located between the cities of Comitan (16 ̊10'43"N and 92 ̊04'20''W) a city with 150,000 inhabitants and La Esperanza (16 ̊9'15''N and 91 ̊52'5''W) a town with 3000 inhabitants. The objective is to analyze the evidence of climate change in the Comitan valley and point out the methodological errors that are committed It was studied of 54 and 30 years of the weather stations 07205 Comitan and 07374 La Esperanza, located within the Grijalva-Usumacinta, Mexico hydrological region (HR) in the context of natural or anthropogenic climatic instability. The methodology used and its conclusions are hasty and lack scientific rigor for the following reasons: 1) It is not possible to obtain surface atmospheric temperature trends of only three weather stations for such a large area as the sub-watershed RD30Gl-Río Grande Comitan It is an unacceptable generalization; 2) The climate of the sub-basin is very varied due to its orography, with heights above sea level ranging from 160 m to 2614 m, there are multiple micro-climates in the study area generated by abrupt hills, the presence of large bodies of water such as lakes, rivers, and streams, and there are valleys, canyons and large areas in the process of deforestation; 3) According to [7] a network of dispersed weather stations is insufficient for the study of the maximum and minimum temperature of an area. This is a wrong argument for the meteorological scales: the results presented in [5] are on a synoptic scale and the stations which were analyzed are on a local scale
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