On the relation between the wet delay and the integrated precipitable water vapour in the European atmosphere

Meteorological Applications - Tập 7 Số 1 - Trang 61-68 - 2000
T. Ragne Emardson1, H. Derks2
1Onsala Space Observatory, Chalmers University of Technology, SE 439 92 Onsala, Sweden (now at Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 238‐600, 4800 Oak Grove Drive, Pasadena, CA 91109)
2Royal Netherlands Meteorological Institute, PO Box 201, 3730 AE De Bilt, Netherlands (now at Meteor Burst Communication Europe BV, Kerkenbos 10‐47, 6546 BB Nijmegen, Netherlands)

Tóm tắt

AbstractA ground‐based network of Global Positioning System (GPS) receivers can be used to determine the excess propagation path of the GPS signals. Using surface pressure data it is possible to derive the excess path caused by water vapour. This quantity is often referred to as the wet delay. We have studied the relationship between the wet delay and the integrated precipitable water vapour (IPWV), based on more than 120 000 radiosonde profiles from 38 sites in Europe. We have studied four different models based on the surface temperature, the latitude of the site, and the time of the year in different combinations. The accuracies of the models have been evaluated and also compared with the accuracy resulting from the use of published model parameters derived from radiosonde data acquired in the United States. The models using the surface temperature data yielded the smallest relative root mean square errors of 1.14% and 1.15% respectively. We find that the accuracy can sometimes be further improved, typically down to 1.02%, by adjusting the values of the model parameters to the area or site of interest. Copyright © 2000 Royal Meteorological Society

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Tài liệu tham khảo

10.1029/RS022i003p00379

10.1029/92JD01517

10.1175/1520-0450(1996)035<0830:GMDEOT>2.0.CO;2

10.1029/97JD03015

10.1029/95EO00198

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Meteorological Applications

Tập 7 Số 1

61-68

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