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Clouds and radiation: contribution of the POLDER instrument

Among the problems that have received increased attention in recent years are the changes in cloud radiative effects due to greenhouse warming and increase in anthropogenic aerosols. Before the end of the century, a series of Earth-orbiting satellites will carry several advanced, well-calibrated, instruments designed to provide global observations of the Earth-atmosphere system. Among them, the polarization and directionality of the Earth's reflectances instrument (POLDER) is a new instrument devoted to the observation of the polarization and directionality of reflected solar radiation. The instrument concept has been accepted on the Japanese Advanced Earth Observing Satellite (ADEOS) platform scheduled for launch in 1996. The aim of this paper is both to show how POLDER may contribute to improve our understanding of the role of clouds and radiation in climate and to highlight the original contributions of this new instrument regarding the cloud-radiation-climate topic.