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 (braunj@ucar.edu).