北陸地方における前線通過時のGPS電波大気遅延変動について

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The most important meteorological product of the Global Positioning System (GPS) is the estimation of precipitable water vapor (PWV). Because there is a dense distribution of GPS sites in Japan and because the PWV can be estimated at short time intervals from GPS data, it is expected that GPS data may improve Japanese weather forecasting. We compared PWV estimated from GPS with PWV obtained from radiosonde data at Wajima in Japan, in order to investigate which analysis method is the most suitable for estimating PWV. PWV obtained without estimating horizontal gradients of tropospheric path delay agreed with PWV obtained from radiosonde data better than that through estimating horizontal gradients. The difference in the PWVs obtained from GPS and radiosonde is related to the wind velocity. The difference shows that the meteorological data obtained with radiosonde is not the data just above the GPS station when there is strong wind there. From this relation, we confirmed that the horizontal gradients obtained from GPS data reflect actual azimuthally inhomogeneity in water vapor. In order to investigate the relationship between PWV change obtained from GPS data and the front passage, we analyzed three sets of data during which cold fronts passed over Hokuriku region : March 19-20,August 24-25,and December 7-8 in 1998. The result in March shows a clear relationship between PWV change and front passage. The PWV increased before the front passed and it decreased clearly after the front passed. The change in August was similar to that in March, but smaller. The PWV in December does not show a clear change. These results may show that the PWV change has seasonal characteristics when a cold front passes. In the case of a stationary front passage during August 26-27,1998,the PWV increased slowly and did not change drastically.
静岡大学の論文

北陸地方における前線通過時のGPS電波大気遅延変動について

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