Escorihuela M. J. auteur aut IRD Kerr Yann auteur aut IRD de Rosnay P. auteur aut IRD Saleh K. auteur aut IRD Wigneron J. P. auteur aut IRD Calvet J. C. auteur aut IRD text journalArticle eng The future Soil Moisture and Ocean Salinity satellite time of overpass is 6 A.m. and 6 P.M. at the equator. In many regions, morning dew is expected at the time of the satellite overpass and might play a role in soil moisture retrievals. The aim of this study was to assess the effects of dew on L-band measurements. Radiometric, biomass, and dew measurements were performed over a natural grass field. Our results show that at the diurnal scale, vegetation internal water content changes play a major role in emission. A direct impact of dew on measurements was not identified. However, a brightness temperature increase of 0.5 and 1 K was observed at vertical and horizontal polarizations' respectively. This increase was detected later after dew, suggesting that it was not directly caused by the presence of dew on the grass blades. Our hypothesis is that the observed increase in brightness temperatures is due to the absorption of dew water by the litter layer. specialized Microwave moisture radiometry soil 126 032 072 6 1 67-71 2009 1545-598X https://www.documentation.ird.fr/hor/PAR00006539 10.1109/lgrs.2008.2000714 1545-598X https://www.documentation.ird.fr/hor/PAR00006539 IRD - Base Horizon / Pleins textes 2011-03-23 2017-08-23 PAR00006539 fre