A comparison of Global Positioning System retrieved precipitable water vapor with the numerical weather prediction analysis data over the Japanese Islands

Iwabuchi, Tetsuya; Naito, Isao; Mannoji, Nobutaka

doi:10.1029/1999jd901007

Cited by 35 publications

(25 citation statements)

References 9 publications

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“…Finally, GPS PWV decreased to ~1 cm at around 1600 UTC when it stopped raining. This kind of correlation between PWV and rainfall agrees with previous analysis results that showed that PWVs increase before it rains and then decrease after the rain (Iwabuchi et al, 2000;Ha et al, 2007). Figure 6 shows three different wet refractivity estimates from MWR, radiosonde, and GPS.…”

Section: B Special Eventssupporting

confidence: 92%

Comparison of atmospheric water vapor profiles obtained by GPS, MWR, and radiosonde

Park

Kim

et al. 2010

Asia-Pacific J Atmos Sci

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In studies of weather changes and, especially, in enhancing the performance of rainfall prediction, it is important to measure the water vapor distribution in the atmosphere. We estimated atmospheric water vapor profiles for fourteen days, including periods of severe weather conditions, by processing ground-based Global Positioning System (GPS) measurements and compared our results with microwave radiometer (MWR) and radiosonde (RAOB) observations. As a result, we found that the standard deviation (STD) of wet refractivity profiles between GPS with MWR was smaller than the STD between RAOB and MWR refractivities; the average STD was 9.3 mm km −1 . In particular, we found that GPS-based wet refractivities detected inversion layers close to those from MWR when the observed GPS satellites were well distributed in the azimuth and elevation angle directions. When the satellite geometry was better, the mean error of GPS wet refractivities with respect to MWR was reduced to 0.4 from 3.2 mm km −1 for altitudes lower than 3 km. In some cases, however, the precision of GPS refractivities are lower than that of RAOB ones relative to MWR results.

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Section: B Special Eventssupporting

confidence: 92%

Comparison of atmospheric water vapor profiles obtained by GPS, MWR, and radiosonde

Park

Kim

et al. 2010

Asia-Pacific J Atmos Sci

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“…There are approximately eighty permanent GPS stations on the Korean Peninsula and the GPS network has great potential for sensing atmospheric water vapor with high temporal and spatial resolution, like the GEONET (GPS Earth Observation NETwork) in Japan (Iwabuchi et al 2000). However, the basic precision and features of PW estimated by GPS measurements in Korea have not been reported.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Precipitable Water Derived from Ground-Based GPS Measurements with Radiosonde Observations over the Korean Peninsula

Kwon

Iwabuchi

Lim

2007

Journal of the Meteorological Society of Japan

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Precipitable water (PW) obtained from a permanent ground-based Global Positioning System (GPS) network on the Korean Peninsula was evaluated by using radiosonde measurements for two years. The GPS-derived PW is also validated using 5-min and 2-hourly troposphere products from International GNSS Service (IGS).The GPS-derived PW from our analysis and the IGS products were reasonably consistent with mean bias (Ours minus IGS products) of À0.27 mm and a standard deviation of 0.78 mm.The PW derived from radiosonde measurement (radiosonde PW) shows dry bias relative to GPSderived PW, where the mean bias (GPS minus radiosonde) is 1.50 mm with a standard deviation of 2.45 mm. We also found systematic bias in radiosonde PW depending on the radiosonde launch time. At the site with 6-hourly high temporal resolution soundings, the bias is greater during day (0900 and 15 LST) than at night (2100 and 0300 LST) with a difference of 1.34 mm in the maximum. In addition, our results show the dependency of error statistics on the absolute amount of PW and seasons. The bias increased for large amounts of PW especially in the daytime. Standard deviation tended to increase under humid conditions, but does not vary with observation time. The possible bias in GPS-derived PW caused by un-modeled phase center variation is also simulated in this study. Most phase observation errors are attributed to multi-path effects caused by the structure of monuments, where the errors are relatively small against the dry biases found in radiosonde PW.Our results addressed the accuracy of GPS-derived PW with reasonable quality and showed strong temporal and spatial variability of PW due to geographic location. These results suggest that GPSderived PW produced by the Korean regional GPS network has great potential to be used for various meteorological applications and could also contribute global GPS climatology.

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“…Total tropospheric zenith path delay of GPS signal is divided into two parts: zenith hydrostatic delay (ZHD) and zenith wet delay (ZWD) (Iwabuchi et al 2000):…”

Section: Radiosonde and Gps Pwv Estimationmentioning

confidence: 99%

Comparison of GPS precipitable water vapor and meteorological parameters during rainfalls in Tehran

Sharifi

Khaniani

Joghataei

2015

Meteorol Atmos Phys

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In this study, the sensing of water vapor using the global positioning system (GPS) was investigated in Tehran. Water vapor mean temperature T m is a key parameter in conversion of GPS zenith wet delay to precipitable water vapor (PWV). Then, by using 8 years of radiosonde and surface temperature data, we achieved a new site-specific T m model in Tehran. After the comparison of Bevis et al. (J Geophys Res 97(D14):15787-15801, 1992) and the site-specific models, a mean bias error of -1.3 K was found for Bevis model, while this is less than 0.1 K for the new local model. Therefore, PWV time series were generated for the ground-based GPS site in Tehran from the beginning of 2005 to the end of 2013. Comparing the GPS with the radiosonde PWV, it was shown that the GPS can be used to measure the PWV with high precision. The root mean square error for differences between the GPS and radiosonde was derived as 1.5 mm. The PWV has significant relationship with precipitation in our case study. The thresholds of the relative humidity anomaly with different PWV anomaly related to rainfall occurrences are also considered in this research. The analyses show that use of PWV anomaly condition together with surface meteorological parameters reduces the number of false rainfall recognitions significantly.

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A comparison of Global Positioning System retrieved precipitable water vapor with the numerical weather prediction analysis data over the Japanese Islands

Cited by 35 publications

References 9 publications

Comparison of atmospheric water vapor profiles obtained by GPS, MWR, and radiosonde

Comparison of atmospheric water vapor profiles obtained by GPS, MWR, and radiosonde

Comparison of Precipitable Water Derived from Ground-Based GPS Measurements with Radiosonde Observations over the Korean Peninsula

Comparison of GPS precipitable water vapor and meteorological parameters during rainfalls in Tehran

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