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Atmospheric Composition, Water & Energy Cycles

We propose to measure and analyze upper tropospheric (UT) and lower stratospheric (LS) water vapor with two aircraft instruments. The UAS Laser Hygrometer (ULH) can participate in the UAS-AVE mission on Global Hawk, and the JPL Laser Hygrometer (JLH) can fly on the NASA WB-57F aircraft in the Tropical Composition, Cloud and Climate Coupling (TC4) campaign from Guam. Both instruments utilize diode laser spectroscopy for rapid, sensitive measurement of UT/LS water. JLH participated in the first phase of TC4 from Costa Rica, and its proposed participation in the upcoming second phase from Guam will enhance the scientific results of this mission. What will be new is the capability to send real-time water vapor mixing ratios to the ground through the aircraft NASDAT system, enabling course corrections during the flight to explore air parcels of interest. The proposed water measurements and analysis address these objectives in the NASA Science Plan: 1. Understand and improve predictive capability for changes in the ozone layer, climate forcing, and air quality associated with changes in atmospheric composition and 2. Progress in understanding the role of oceans, atmosphere, and ice in the climate system and in improving predictive capability for its future evolution. This proposal addresses the following scientific objectives of the NRA for UT/LS water vapor: How is atmospheric composition changing? What trends in atmospheric constituents and solar radiation are driving global climate? How do atmospheric trace constituents respond to and affect global environmental change? More specifically, we will investigate the physical mechanisms that control long-term changes in ice clouds and humidity in the UT/LS. To address these science questions, we will carry out accurate field measurements during UAS-AVE and TC4-Guam, supported by careful laboratory measurements to characterize instrument response at room temperature and low temperature.

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: Aug 09, 2010

Last Activity: Mar 18, 2011

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