Thornthwaite’s Climate Regionalization for the State of Tocantins, Brazil

Abstract

Tocantins State faces a large-scale agricultural expansion. Thus, climate studies are essential for a better understanding of climate variability supporting agricultural and environmental planning. In this context, this study applies the climatic classification of Thornthwaite and develops a climate regionalization through geostatistical techniques, assessing the performance of the interpolators ordinary kriging (OK) and cokriging (CK). Data from 26 weather stations located in Tocantins State and surroundings were used. The variables of interest to climate regionalization, obtained by the climatic water balance, were mapped by geostatistical techniques. The results of cross-validation showed that ordinary kriging and cokriging performed well. The spherical and exponential semivariogram models obtained the best fit in 40% of the analyzes each, and the gaussian in 20%. The climatic classification of Thornthwaite applied to Tocantins State showed the presence of humid (B1), moist subhumid (C2), and dry subhumid (C1) climates. There were found three climatic regions: B1A’wa’: Humid, megathermal, with moderate winter water deficiency, and a temperature efficiency regime normal to megathermal , occurring in the western region of the state; C2A’wa’: Moist subhumid, megathermal, with moderate winter water deficiency, and a temperature efficiency regime normal to megathermal , occurring in the central region and extending from the north to the south of the state; and C1A’w2a’: Dry subhumid, megathermal, with large summer water surplus, and a temperature efficiency regime normal to megathermal , in the east and northeast of the state.

Mapeamento de Chuvas Intensas para o Estado do Tocantins

“…Embora tenha sido encontrada pequena diferença nos valores do EMPA, o menor erro foi produzido pelo modelo esférico (5,59%), sendo que, todos os modelos apresentaram Bias inferior a 1%, alcance superior a 66 km e GD que os classificam como de forte dependência espacial. Souza et al (2019) obtiveram melhor desempenho do modelo esférico em estudos sobre regionalização climática no Tocantins. Mello et al (2003), comparando os interpoladores krigagem e inverso do quadrado da distância, também observaram bom ajuste do modelo esférico.…”

“…Segundo Souza (2019), ocorrem no Estado do Tocantins três regiões climáticas homogêneas, sendo: 1) região climática C1s2A'a': Clima subúmido seco, com grande concentração de chuvas no verão, megatérmico; 2) região climática C2wA'a': clima subúmido, com deficiência de água moderada no inverno, megatérmico e 3) região climática B1wA'a': clima úmido, com deficiência d'água moderada no inverno, megatérmico.…”

Spatial variability of the horizontal structure and production of biomass in Massai grass in an agropastoral system

“…The region's climate, according to Koppen's classification, is Aw (hot and humid). The average annual temperature is 24.5 ºC, and the average annual relative humidity is 65%, with 1532 mm of annual precipitation (SOUZA et al, 2019). The soil used in the experiment was the Plinthossolo Pétrico Concretário (EMBRAPA, 2013).…”

Principais Fármacos Desenvolvidos a Partir Da Extração Do Veneno De Serpentes Brasileiras E Suas Aplicabilidades Em Medicina Humana E Veterinária

“…O estudo foi conduzido na Universidade Federal do Tocantins, Campus de Gurupi, no período de março a dezembro de 2020. A região está localizada a 11º48'29" S, 48º56'39" W, 280 m de altitude, caracterizada como B1A'wa', clima úmido, megatérmico, com moderada deficiência de água no inverno (SOUZA et al, 2019).…”