Estimations of Atmospheric Excess Path Delay based on Three-Dimensional, Numerical Prediction Model Data.
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概要
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We compare the zenith wet delays estimated from the global analysis data sets produced by Japan Meteorological Agency (JMA), with those obtained by the radiosonde data sets at eight stations in Japan. Both estimates agree well with each other in both amplitude and phase through nearly one year. The rms of their differences is of the order 1.5-3.0 cm and it indicates that the numerical prediction data is available to estimate the wet delay. Next, we calculate the atmospheric excess path delays by ray tracing based on the JMA 10 km spectral model data (10 km data) to evaluate its variability considering azimuthal asymmetry of atmosphere by comparing with the delay estimated by the spherically symmetric atmosphere. The 10 km data is produced every three hours from 1200 UTC 28 to 1200 UTC 29 June, 1989, with a spatial width of about 800×800 km. The precipitable water vapor predicted by the 10 km data is good consistent with that observed by radiosonde within 0.5 cm rms. The difference of wet delays at both ends of the baselines (differential wet delay) at the elevation of 15° exceeds 60 cm, in maximum when baseline directions are parallel to the horizontal gradient of water vapor. At the same baseline directions and elevations angle, the differential wet delay due to the azimuthal asymmetry more than a few centimeters distributes in local scales of 50-300 km width and in synoptic scales along the cold front. The maximum differential wet delay reaches up to 6 cm. When the temperature gradient is significant, the differential hydrostatic delay due to the azimuthal asymmetry at 15° elevation angle exceeds 1 cm. These results imply that the estimation of atmospheric excess path delay considering spatial distributions of water vapor is indispensable to attain the ultimate accuracy of space geodetic technique.
- 日本測地学会の論文
日本測地学会 | 論文
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