Estimating the daily upward longwave surface radiation flux from NOAA-AVHRR data

ese results. There is a lack of meteorological observations in the majority of intertropical regions. Brazil is an example and as consequence is practically impossible to have available soil measurements. One attractive option to solve this problem is the utilization of remote sensing in the infrared spectrum. This alternative offer uniform and global evaluations not only the surface temperatures but also the energy fluxes, generally functions of those temperatures.

In this context, a research was developed with the objective of estimating the daily upward longwave surface radiation flux. For this calculation its necessary the surface temperature evaluation obtained at the beginning of the afternoon from the Advanced Very High Resolution Radiometer (AVHRR) onboard the satellites National Oceanic Atmospheric Administration series (NOAA-n), the minimum air temperature, easily available from the meteorological stations and the day length, computed from the site coordinate and data, utilizing classical astronomic equations. This model employs an unique empirical coefficient statiscally adjusted from a large data.

New investigations have been conducted to verify the coherence of t