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Atmospheric Composition

We propose to measure water vapor in-situ during the MACPEX field mission for studies of relative humidity in clouds and satellite validation. These measurements will be made with an upgraded version of the JPL Laser Hygrometer (JLH) on the WB-57F. This research is needed because water vapor is a key measurement in ice cloud microphysics studies. Relative humidity will be calculated both in and out of ice clouds. Advantages of JLH over other hygrometers are: Compatibility with aircraft REVEAL system and ethernet, Small and lightweight instrument package, No outgassing (free stream measurement), Fast time response (20 Hz) measurements in and out of clouds, Accurate with a low detection limit <1 ppmv, Agreement with key hygrometers, including EOS MLS and the Cryogenic Frostpoint Hygrometer. Upgrades to JLH will be implemented during early 2010 with our core funding. These upgrades include new electronics that were already installed in our UAS Laser Hygrometer (ULH) and flight-proven during the NOVICE mission in September 2008. The value added to the NASA sponsor by JLH is accurate measurement of water vapor from a compact scientific instrument that is straightforward to deploy on the WB-57F aircraft, high-resolution in-situ measurements to test microphysical models of ice clouds, and A-Train validation from a team that has experience with both Aqua and Aura water vapor retrievals. This work is proposed to be conducted as Fundamental Research.

Project PI: Robert Herman/Jet Propulsion Laboratory

Jet Propulsion Laboratory M/S 183-401 4800 Oak Grove Drive Pasadena, CA 91109

Phone: (818) 393-4720

Fax: (818) 393-4445

Email: robert.l. herman@jpl.nasa.gov

http://tes.jpl.nasa.gov/people/robertherman/

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Started: Sep 27, 2010

Last Activity: Jan 04, 2011

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