Comparison of Precipitable Water Vapor Observations by GPS, Radiosonde and NWP Simulation
Precipitable water vapor (PWV) derived from a numerical weather prediction (NWP) model were compared to observations derived from ground-based Global Positioning System (GPS) receivers. The model data compared were from the Weather Research and Forecasting (WRF) model short-range forecasts on nes...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Space Science Society (KSSS)
2009-12-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2009/v26n4/OJOOBS_2009_v26n4_555.pdf |
| Summary: | Precipitable water vapor (PWV) derived from a numerical weather prediction (NWP)
model were compared to observations derived from ground-based Global Positioning
System (GPS) receivers. The model data compared were from the Weather Research
and Forecasting (WRF) model short-range forecasts on nested grids. The numerical
experiments were performed by selecting the cloud microphysics schemes and for the
comparisons, the Changma period of 2008 was selected. The observational data were
derived from GPS measurements at 9-sites in South Korea over a 1-month period, in
the middle of June-July 2008. In general, the WRF model demonstrated considerable
skill in reproducing the temporal and spatial evolution of the PWV as depicted by
the GPS estimations. The correlation between forecasts and GPS estimates of PWV
depreciated slowly with increasing forecast times. Comparing simulations with a resolution of 18 km and 6 km showed no obvious PWV dependence on resolution.
Besides, GPS and the model PWV data were found to be in quite good agreement with
data derived from radiosondes. These results indicated that the GPS-derived PWV
data, with high temporal and spatial resolution, are very useful for meteorological
applications. |
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| ISSN: | 2093-5587 2093-1409 |