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- W128232065 abstract "Radio Occultation (RO) soundings of the Earth’s atmosphere utilizing existing Global Navigation Satellite System (GNSS) signals has been carried out in several satellite missions starting with the GPS/MET experiment onboard the MicroLab 1 satellite [1]. These measurements provide information on the bending of the GNSS signals due to atmospheric refractive index variations. The bending information is used to retrieve vertical profiles of refractivity which in turn can be inverted to vertical profiles of pressure and temperature when the atmospheric water vapour content is negligible. When the water vapour contents cannot be neglected the water vapour profile can be obtained from a priori knowledge of the temperature. Water vapour is a strong greenhouse gas and due to its large abundance it has significant influence on the climate. Also, due to the large energy transfers associated with the phase transitions of water it impacts the short term dynamics of the atmosphere considerably e.g. by stimulating the development of tropical hurricanes. Therefore an accurate knowledge of the temporal and spatial water vapour distribution is important for both climate research and weather prediction. Recently improved RO missions with potential of independent retrieval of both temperature and humidity without a priori information has been proposed, see [2] and [3]. In the work presented here we simulate the concept of the proposed ACE+ mission, which include occultations between Low Earth Orbiting (LEO) satellites at three different frequencies around the 22.3 GHz water vapour absorption line. By measuring not only the phase but also the amplitude variations of the signals unambiguous retrieval of temperature and humidity profiles is made possible. In this study we investigate the potential of the ACE+ system by performing end-to-end simulations using different realistic noise scenarios, the corresponding errors in temperature and humidity are presented and discussed." @default.
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- W128232065 date "2003-01-01" @default.
- W128232065 modified "2023-09-27" @default.
- W128232065 title "Water Vapour Profiling Using LEO-LEO Inter-Satellite Links" @default.
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