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Atmospheric Composition

We will continue ALIAS' (Aircraft Laser Infrared Absorption Spectrometer) important measurements of total water, total water isotopes, and carbon monoxide as well as extend measurement capabilities to include real-time carbon dioxide isotope ratios. No other instrument provides real-time measurements of carbon dioxide isotope ratios which are clear identifiers of atmospheric transport (18O/17O/16O for stratospheric intrusion, 13C/12C for anthropogenic signals). ALIAS easily adapts to changing mission priorities and can be configured to measure HCl, CH4, SO2, and N2O by simply replacing a semiconductor laser. - These measurements contribute to Atmospheric Composition Focus Area research by providing key data on how convective processes affect stratospheric composition, the development of cirrus particles and their affect on Earth's radiative balance, and health of the ozone layer through measurement of chlorine partitioning. - ALIAS measurements address TC4-Guam priorities by providing total water, total water isotope, and carbon monoxide measurements to understand TTL transport and ice crystal growth. - ALIAS measurements will help validate Aura retrievals of water vapor, IWC, water isotope ratios, and carbon monoxide. We will fly ALIAS on small plane platforms other than the WB-57F to conduct science missions pertinent to Atmospheric Composition goals and Aura validation needs. ALIAS typically flies on the WB-57F and acquires in situ measurements at time scales under 1 second. For the near term, ALIAS will focus on: (1) Total water (gas + particle); (2) Total water isotope ratios (D/H, 18O/16O); (3) Ice-water content (IWC) in conjunction with the JPL laser hygrometer (JLH); (4) Carbon monoxide. We will also extend ALIAS' measurement capability to CO2 isotopic ratios (13C/12C, 18O/17O16O).

Project PI: Lance Christensen/Jet Propulsion Laboratory

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

Phone:(818)354-0521

Fax:(818)354-5148

http://science.jpl.nasa.gov/people/Christensen/

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Started: Aug 09, 2010

Last Activity: Dec 10, 2010

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