The GPS water vapour tomography is a new technique which provides spatially resolved water vapour distributions in the atmosphere under all weather conditions. This work investigates the information contained in a given set of GPS signals as a precondition to an optimal tomographic reconstruction. The spatial distribution of the geometric intersection points between different ray paths is used ...

Protons from hydrogen or water vapour may dissolve in oxides and other corrosion products, and may affect, and in some cases, dominate their defect structures. Defect-dependent properties like scale growth and plastic deformation then become dependent on the ambient hydrogen or water vapour pressure. Small concentrations of protons may enhance the transport of oxygen in the form of hydroxide io...

This paper considers only the IRS mission, for which the highest priority is on atmospheric dynamics in support to Numerical Weather Prediction (NWP) at regional and global scales. This will be achieved through the provision of Atmospheric Motion Vectors (AMV), to be extracted from tracking of horizontally and vertically resolved water vapour patterns, retrieved from the hyperspectral radiances...

1 University of Bern, Bern, Switzerland 2 Max-Planck-Institute for Biogeochemistry, Jena, Germany 3 Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany 4 Central Aerological Observatory, Moscow Region, Russia 5 Forschungszentrum Jülich GmbH, Jülich, Germany 6 DLR, Institut fuer Physik der Atmosphaere, Oberpfaffenhofen, Germany 7 Chalmers University of Technology, Göteborg, Sweden *...

The topic of this paper is the expected (from modelling) and observed sensitivity of the brightness β of noctilucent clouds (NLC) on the ambient water vapour mixing ratio f (H 2 O). Firstly, we show that state-of-the-art models of NLC layer formation predict that in the Arctic summer, a 10% increase of f (H 2 O) in the upper mesosphere should 5 lead to a 22% increase in β. Secondly, we review o...