The 3D Tomography Technique and Application of Water Vapor Using Ground-based GPS Networks in Shanghai

Computer Science – Sound

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Astrometry, Atmospheric Effects, Methods: Numerical

Scientific paper

Precipitable water vapor (PW) is a column average of atmospheric water vapor over both space and time and is estimated by GPS (Global Positioning System). The signals from GPS are used to retrieve the integrated quantity of water vapor along the path between a transmitting satellite and a receiving station. This quantity is called slant water vapor (SW). Measurements of SW allow for an improved assessment of the spatial distribution of water vapor within the atmosphere, which is called tomography technique. These are the main methods of remote-sensing water vapor by GPS. There are dense networks of GPS stations in Shanghai. These networks are used to assess the 3D distributions of water vapor. Taking a heavy storm in the city center on Aug. 25th 2008 as an example, the 3D distributions of water vapor supply more information for the weather analyses compared with the traditional atmospheric sounding ways. It is proved that the tomography technique is very useful for the disastrous weather.

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