The Moon as a diagnostic tool for microwave sensors

Martin Burgdorf , T. Lang, S. Michel, Stefan Buehler and Imke Hans
Publication type: 
Newsletter Article
Publication status: 
The upper tropospheric humidity (UTH) is an essential climate variable that is required to monitor the global water vapor climate feedback and hence to understand changes in atmospheric dynamics associated with global warming. The UTH can vary considerably within a few hours, but the trends caused by climate change manifest themselves as small changes over decades. Detecting them with microwave sensors in space makes high demands on the long-term stability of the sensors' flux calibration. It is therefore desirable to employ a second invariable reference in order to check the stability of the flux calibration: the Moon.