Potential evapotranspiration estimates for northeast Brazil using GOES-8 data

Revista Brasileira de Engenharia Agrícola e Ambiental

Souza, Jaidete M. de²  Bastos, Eduardo J. de Brito¹  Rao, Tantravahi V. Ramana² 

[1] UFPB, Campina Grande;INPE, São José dos Campos

关键词: Northeast-Brazil;    potential evapotranspiration;    meteorological satelliteRESUMO Neste trabalho foi utilizado o método empírico proposto por Caselles et al;   

DOI  :  10.1590/S1415-43662000000300008

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

In this study, an empirical method proposed by Caselles et al. (1992a) is utilized to determine the potential evapotranspiration (ETP) on a regional scale. This method uses the global solar radiation data retrieved by the global radiation model GL1.0, which in turn utilizes data from the visible channel of the GOES-8 satellite. This method is applied to the northeast region of Brazil, using daily and monthly climatological data as the ground truth information to estimate the ETP and the estimated daily ETP data for September, 1997. The methodology involved three steps: 1) to perform a spatial regionalization of the ETP using the method of Ward, which is available in the Statistical Package for the Social Sciences (SPSS); 2) to obtain the correlation between the ETP as estimated by the methods of Jensen & Haise (1963) - MJH, Caselles (1992a) - MCA, and the Penman's combined method (1948) - MCP; 3) to test the sensibility of the empirical formulations proposed and to assess the estimates using the satellite-based global solar radiation provided by the GL1.0 model. The spatial regionalization shows two distinct regions in the Northeastern Brazil. The MCA yielded better results than the MJH. The ETP estimates using satellite data were satisfactory, showing a maximum error of 20% when compared with the ground truth data.

【 授权许可】

CC BY-NC