Análise da regionalização do déficit de pressão de vapor em condições semiáridas

Abstract

The pressure difference between the amount of vapor water in the air and the maximum pressure that can be reached is called the saturation vapor pressure deficit of water in the air. The objective was to evaluate the regionalization of air vapor pressure deficit in three Data Collection Platforms (DCPs) in the semiarid region of the State of Ceará. They used data times the average air temperature (Tmed), average relative humidity (URmed) and precipitation needed for obtaining and analyzing the vapor pressure deficit (VPD). The data come from the automatic weather stations Aiuaba, Taua (Hinterland Inhamuns) and Campos Sales (Cariri), monitored by FUNCEME and by INMET and refer to the period from March 2008 to March 2015. Collection Platforms data (PCD) of Campos Sales and Taua are in operation since March 2008 and July 2007, respectively, and the PCD Aiuaba, which was installed in 2008 is still being implemented. We evaluated the efficiency of data collection, the temporal distribution of the DPV in daily scale, monthly and yearly and the relationship between the three PCDs in order to retrieve the missing data in the PCD Aiuaba. The results indicate that the efficiency of data collection was in the order of 96%, 98% and 47% for PCD Campos Sales, Taua and Aiuaba respectively. The PCD Aiuaba had a deficit in its meteorological database of 53%, thus compromising the results of the study. The three PCDs statistical differences and to complete the work regionalization of the data was required. Despite Taua PCD is in the same macro-region of Aiuaba (Hinterland of Inhamus) Campos PCD Sales (macro-region of Cariri) more statistically resembled PCD Aiuaba.