In this study, global positioning system (GPS)-derived precipitable water vapor (PWV) and microwave radiometer(MWR)-measured integrated water vapor (IWV) were compared and their characteristics were analyzed. Comparingthose two quantities for two years from August 2009, we found that GPS PWV estimates were larger than MWR IWV. Theaverage differenceover the entire test period was 1.1 mm and the standard deviation was 1.2 mm. When the discrepanciesbetween GPS PWV and MWR IWV were analyzed depending on season, the average difference was 0.7 mm and 1.9mm in the winter and summer months, respectively. Thus, the average difference was about 2.5 times larger in summerthan that in winter. However, MWR IWV measurements in the winter months were over-estimated than those in the summermonths as the water vapor content got larger. The results of the diurnal analysis showed that MWR IWV was underestimatedin the daytime, showing a difference of 0.8 mm. In the early morning hours, MWR IWV has a tendency to beover-estimated, with a difference of 1.3 mm with respect to GPS PWV.

• Sohn, Dong-Hyo(Department of Geoinformatic Engineering, Inha University)
• Park, Kwan-Dong( Department of Geoinformatic Engineering, Inha University) | Park, Kwan-Dong
• Won, Ji-Hye( Department of Geoinformatic Engineering, Inha University) | Won, Ji-Hye
• Cho, Jung-Ho( Korea Astronomy and Space Science Institute) | Cho, Jung-Ho
• Roh, Kyoung-Min( Korea Astronomy and Space Science In) | Roh, Kyoung-Min