The influence of the moisture gradient on the accuracy of precipitable water derived from GPS data
作者： Hiroyuki Iwasaki , Fujio Kimura , Kiyotaka Nakagawa , Takahiro Miki , Fumiaki Kimata
DOI: 10.2151/JMSJ1965.78.3_223
关键词:
摘要: One of the major sources error in estimating precipitable water derived from GPS data is horizontal gradient moisture. Several characteristics were investigated comparison with water-vapor radiometer measurements. The GPS-precipitable (GPS PW) exhibited good agreement correlation coefficient and rms for this determined as 0.991 1.93 mm, respectively. estimation errors PW can be divided into two components based on time scale variation. first has low frequency several days, an amplitude about 2.5 mm. This was negatively correlated north-south component GPS-PW data. overestimated under condition which vapor increased southward. Another high hours, having at most 5.0 seems to depend rapid changes gradient.
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