IHOP_2002 Water Vapor Intercomparison Workshop
GPS Instrumentation Specification and Performance
John J. BraunCOSMIC Program
University Corporation for Atmospheric Research
Boulder, Colorado
IHOP_2002 Water Vapor Intercomparison Workshop
Outline
•GPS Stations Operating for IHOP
•Network Operation and Data Collection Percentage•Homestead Site•General Network Statistics
•Data Products•Precipitable Water Vapor•Slant Water Vapor•Tomography Solutions
IHOP_2002 Water Vapor Intercomparison Workshop
GPS Stations In IHOP Region
NOAA/FSL and DOT Stations
OU/ARM/SuomiNet Stations
Special Stations for IHOP
41 Stations Total
IHOP_2002 Water Vapor Intercomparison Workshop
Acknowledgements
CNRS - CNRM/GAME - France (contact: Joel Van Baelen)
NOAA Forecast Systems Laboratory (contact: Seth Gutman)
University of Oklahoma (contact: Randy Peppler)
ARM Program (contact: James Liljegren)
NASA/GSFC (contact: Dave Whiteman)
IHOP_2002 Water Vapor Intercomparison Workshop
Homestead (SA14) Data Collection
IHOP_2002 Water Vapor Intercomparison Workshop
ARM CF (SG01) Data Collection
IHOP_2002 Water Vapor Intercomparison Workshop
French Station (BLAC) Data Collection
IHOP_2002 Water Vapor Intercomparison Workshop
GPS Data Products
Data Product Time Resolution
Accuracy Location
PW 30 Min 1.5 mm Station Specific
SW 2 Min ~1.5 mm Station Specific
Tomography 15 Min ??? (g/m3) ARM CF Region
IHOP_2002 Water Vapor Intercomparison Workshop
SW is the integrated water vapor along single GPS ray paths PWV is the average (estimate) of all SW observations in a cone scaled
to zenith Simultaneous observations along 8-12 GPS ray paths GPS and WVR sensed SW and PWV agree to ~1.5 mm rms
PWV
SW
GPS PW and SW and Descriptions
IHOP_2002 Water Vapor Intercomparison Workshop
Precipitable Water Vapor
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IHOP_2002 Water Vapor Intercomparison Workshop
Slant Water Vapor
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IHOP_2002 Water Vapor Intercomparison Workshop
Example of SW During Storm
IHOP_2002 Water Vapor Intercomparison Workshop
International H20 Project Tomography Solution
IHOP_2002 Water Vapor Intercomparison Workshop
Conclusions
• 41 GPS Stations in IHOP_2002 Region
• Homestead station had high percentage of data availability
• PW (30 min), SW (2 min), and Tomography Solutions Available
• All GPS data are processed. PW data are available at JOSS web site. If someone is interested in SW and/or tomography data, they should contact me directly ([email protected]).