Daily net radiation estimated from air temperature and NOAA-AVHRR data: a case study for the Iberian Peninsula

In this work we present a methodology to obtain the daily net radiation flux from NOAA-AVHRR data. To achieve this we need first to obtain shortwave net radiation flux from the solar global radiation flux and the albedo map. Secondly, we need to obtain the upward longwave radiation flux from surface temperature and emissivity and the downward longwave radiation flux from air temperature and vapour pressure. A daily net radiation flux image corresponding to flat areas of the Iberian Peninsula is presented as an example in which we show that daily net radiation flux can be obtained with an uncertainty of approximately 1.5 mm day(-1).