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Precipitable water observed by ground-based GPS receivers and microwave radiometry
Earth, Planets and Space volume 52, pages445–450(2000)
The sensing of absolute precipitable water vapor (PW) by the Global Positioning System (GPS) and a Water Vapor Radiometer (WVR) is presented. The GPS approach requires a priori knowledge of the relationship between the weighted mean temperature of the atmosphere and surface temperature whose regression relationship is derived based on ten-year climatological data observed by radiosonde and surface meteorological instruments. Similarly, the WVR scheme needs a priori information of the relationship between sky brightness temperature and PW whose regression relationship is characterized based on the same set of climatological data. GPS-derived PW are compared with those observed by WVR and radiosondes. The GPS and WVR data were collected at the Taipei weather station of Taiwan Central Weather Bureau (CWB) from March 18 to 24, 1998. To obtain the estimates of absolute PW at the Taipei site, GPS data acquired from Tsukuba, Japan, at a distance of 2155 km from Taipei were utilized. It is found that GPS-derived PW agrees reasonably well with observations by the WVR and radiosondes. The average of GPS-derived PW is 3.38 cm with a standard deviation of 0.39 cm. The difference between the average GPS-derived and WVR-observed PW is 0.27 cm with a bias of −4 cm, while the difference between the average GPS-derived and radiosonde-observed PW is somewhat larger, 0.36 cm with a bias of −0.42 cm. These differences are larger than differences reported at higher latitudes in regions with lower average humidity.
Bean, B. R. and E.J. Dutton, Radio Meteorology, 435 pp., Dover, New York, U.S.A., 1968.
Beutler, G., E. Brockman, S. Frankhauser, W. Gurtner, J. Johnson, L. Mervart, M. Rothacher, S. Schaer, T. Springer, and R. Weber, Bernese GPS Software Version 4.0, Univ. Of Berne, 418 pp., 1996.
Bevis, M., S. Businger, T. A. Herring, C. Rocken, R. A. Anthes, and R. H. Ware, GPS meteorology: Remote sensing of atmospheric water vapor using the global positioning system, J. Geophys. Res., 97, 15,784–15,801, 1992.
Bevis, M., S. Businger, S. Chiswell, T. A. Herring, R. A. Anthes, C. Rocken, and R. H. Ware, GPS meteorology: Mapping zenith wet delays onto precipitable water, J. Appl. Meteorol., 33, 379–386, 1994.
Businger, S., S. R. Chiswell, M. Bevis, J. Duan, R. A. Anthes, C. Rocken, R. H. Ware, M. Exner, T. Van Hove, and F. S. Solheim, The promise of GPS in atmospheric monitoring, Bull. Amer. Meteorol. Soc., 77, 5–18, 1996.
Duan, J., M. Bevis, P. Fang, Y. Bock, S. Chiswell, S. Businger, C. Rocken, F. Solheim, T. van Hove, R. Ware, S. McClusky, T. A. Herring, and R. W. Ware, GPS Meteorology: Direct estimation of the absolute value of precipitable water, J. Appl. Meteorol., 35, 830–838, 1996.
Emardson, T. R., G. Elgered, and J. Johansson, Three months of continuous monitoring of atmospheric water vapor with a network of GPS receivers, J. Geophys. Res., 103, 1807–1820, 1998.
Heymsfield, A., B. Gandrud, G. McFarquhar, T. Van Hove, and R. Ware, GPS, WVR, and radiosonde measurements of precipitable water at a tropical Indian Ocean site, J. Oceanic Atmos. Technol., 2000 (in preparation).
Janssen, M. A., An introduction to the passive microwave remote sensing of atmospheres, in Atmospheric Remote Sensing by Microwave Radiometry, Edited by M. A. Janssen, 572 pp., John Wiley & Sons, Inc., New York, U.S.A., 1993.
Liebe, H. J., MPM—An atmospheric millimeter wave propagation model, Int. J. Infrared Millimeter Waves, 10, 631–650, 1989.
Liou, Y.-A., Spatial variation in atmospheric wet delay observed by a ground-based, dual-channel radiometer, J. Photogrammetry and Remote Sensing, 4, 31–41, 1999a (in Chinese).
Liou, Y.-A., Ground-based radiometric sensing of atmospheric dynamics in precipitable water vapor, Atmospheric Sciences, 27, 141–158, 1999b (in Chinese).
Liou, Y.-A. and M. Yang, Precipitable water from GPS: A WVR constraint approach, Atmospheric Sciences, 27, 131–140, 1999 (in Chinese).
Radiometrics WVR-1100 Instrument Manual, WVR-1100 Water Vapor and Liquid Water Radiometer, 30 pp., June 12, 1997.
Rocken, C., R. Ware, T. Van Hove, F. Solheim, C. Alber, J. Johnson, M. Bevis, and S. Businger, Sensing atmospheric water vapor with the Global Positioning System, Geophys. Res. Lett., 20, 2631–2634, 1993.
Rocken, C., T. Van Hove, J. Johnson, F. Solheim, R. Ware, M. Bevis, S. Businger, GPS Storm—GPS Sensing of atmospheric water vapor for meteorology, J. Oceanic Atmos. Technol, 12, 468–478, 1995.
Rocken, C., T. Van Hove, and R. Ware, Near real-time GPS sensing of atmospheric water vapor, Geophys. Res. Lett., 24, 3221–3224, 1997.
Tregoning, P., R. Boers, D. O’Brien, and M. Hendy, Accuracy of absolute precipitable water vapor estimates from GPS observations, J. Geophys. Res., 103, 28,701–28,710, 1998.
Ware, R., C. Alber, C. Rocken, and F. Solheim, Sensing integrated water vapor along GPS paths, Geophys. Res. Lett., 24, 3583–3586, 1997.
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Liou, Y., Huang, C. & Teng, Y. Precipitable water observed by ground-based GPS receivers and microwave radiometry. Earth Planet Sp 52, 445–450 (2000) doi:10.1186/BF03352256
- Global Position System
- Brightness Temperature
- Global Position System Data
- Atmospheric Water Vapor
- Precipitable Water Vapor