HR: 1340h
AN: A53C-0907    [Abstracts]
TI: Novel Instrumentation for In-Situ Carbon Monoxide Measurements in the Troposphere and Stratosphere
AU: * Provencal, R A
EM: r.provencal@lgrinc.com
AF: Los Gatos Research, 67 East Evelyn Avenue Suite 3, Mountain View, CA 94041 United States
AU: Owano, T
EM: t.owano@lgrinc.com
AF: Los Gatos Research, 67 East Evelyn Avenue Suite 3, Mountain View, CA 94041 United States
AU: Gupta, M
EM: m.gupta@lgrinc.com
AF: Los Gatos Research, 67 East Evelyn Avenue Suite 3, Mountain View, CA 94041 United States
AU: Baer, D S
EM: d.baer@lgrinc.com
AF: Los Gatos Research, 67 East Evelyn Avenue Suite 3, Mountain View, CA 94041 United States
AU: Ricci, K
EM: k.ricci@lgrinc.com
AF: Los Gatos Research, 67 East Evelyn Avenue Suite 3, Mountain View, CA 94041 United States
AU: O'Keefe, A
EM: a.okeefe@lgrinc.com
AF: Los Gatos Research, 67 East Evelyn Avenue Suite 3, Mountain View, CA 94041 United States
AU: Podolske, J
EM: jpodolske@mail.arc.nasa.gov
AF: NASA Ames Research Center, MS 245-5 , Moffet Field, CA 94035 United States
AB: The carbon monoxide mixing ratio has been significantly altered by the burning of fossil fuels and can serve as an indicator of pollution transport, with vertical profiles of CO showing considerable structure related to regional pollution sources. These profiles are measured in-situ by airborne instrumentation that is capable of accurately determining the CO mixing ratio in a rapid fashion. Currently, this mixing ratio is determined by using lead-salt diode lasers to perform tunable diode laser absorption spectrometry (TDLAS), resulting in an instrument that requires frequent user intervention to realign the optical cell and adjust the laser. The recent emphasis on using Unmanned Aerial Vehicles (UAVs) to make atmospheric measurements has created a need for more robust, autonomous analytical instrumentation. We will present a carbon monoxide analyzer based on combining emerging quantum cascade laser (QCL) technology with Off-Axis Integrated Output Spectroscopy (Off-Axis ICOS). The spectroscopic technique will be described in detail along with in-situ data from multiple NASA DC-8 flights demonstrating the instrument's capability to autonomously measure CO to better than 200 ppt in less than one second, without the need for any user intervention. Ongoing efforts to extend the instrument's capabilities to measure multiple species (CO, N$_{2}$O, and CH$_{4}$) while making it suitable for UAV deployment will also be discussed.
DE: 0345 Pollution--urban and regional (0305)
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting