NOAA logo NOAA FSL (National Forecast Systems Laboratory), GPS Observing Systems Branch

What does this program measure?

Total Atmospheric Water Vapor

How does this program work?

The dual frequency GPS receiver will continuously observe all satellites in view. Dual frequency carrier phase observations will be made very 30 seconds. Data will be transferred to the PC every 30 minutes. Quick-look displays will be created by Forecast Systems Laboratory (FSL) and will be available via the internet.

Why is this research important?

Global Positioning System Meteorology gives us the ability to measure the total quantity of water vapor in the atmosphere with unprecedented accuracy under all weather conditions. By continuously monitoring the ratio of integrated precipitable water vapor (IPW) at MLO to three nearby stations at or near sea level, we can evaluate short and long-term changes in the mean temperature of the atmosphere above 600 h Pa.

Are there any trends in the data?

How does this program fit into the big picture?

What is it's role in global climate change?

Comments and References

Lead Investigator(s):

Seth I. Gutman
Kirk Holub

MLO Contact(s):

Darryl Kuniyuki
808-933-6965 (x236)
David Nardini

808-933-6965 (x229)

Web Site(s)

Date Started


Related Programs

Ozone & Water Vapor

FSL GPS Sensor facing North
GPS antenna
FSL GPS Sensor Head Closeup
Sensor head