Abstract
Down looking (DL) GPS radio occultation can produce an estimate of the atmospheric refractivity profile. The main observations are the bending angle as a function of the impact parameter. DL provides both negative as well as positive elevation angle measurements. Abel inversion can be operated on a profile of partial bending angle found by subtracting the positive elevation measurement from the negative one with the same impact parameter. In order to obtain refractivity profiles within the atmospheric boundary layer, the DL measurement experiment was performed in collaboration with JPL on the top of Mt. Fuji from July 10th to September 25th, 2001. The GPS receiver, Turbo Rogue SNR-8000, and the chock ring antenna were installed at an altitude of 3776m. On average, the numbers of daily occultation that include the negative elevation angles were six events. We succeeded in deriving the refractivity profiles, which were consistent with the radiosonde observation from these DL measurement data by applying Abel inversion. For the future, we intend to realize DL measurement from an airplane to extend the observation range.
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Mousa, A., Shoji, Y., Aoyama, Y., Nakamura, H., Tsuda, T. (2004). Refractivity Profiles Obtained by Abel Inversion from a Down Looking GPS Radio Occultation Experiment at Mt. Fuji: Preliminary Results and Future Plan. In: Kirchengast, G., Foelsche, U., Steiner, A.K. (eds) Occultations for Probing Atmosphere and Climate. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-09041-1_16
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DOI: https://doi.org/10.1007/978-3-662-09041-1_16
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