HR: 0800h
AN: B41B-0183    [Abstracts]
TI: Development of a Ground-Based CO2 Profiling DIAL System for Atmospheric Boundary Layer Studies
AU: * Ismail, S
EM: s.ismail@larc.nasa.gov
AF: NASA Langley Research Center, MS 401A, Hampton, VA 23681 United States
AU: Davis, K
EM: davis@essc.psu.edu
AF: Pennsylvania State University, 503 Walker Building, University Park, PA 16802 United States
AU: Koch, G
EM: g.j.koch@larc.nasa.gov
AF: NASA Langley Research Center, MS 468, Hampton, VA 23681 United States
AU: Abedin, M N
EM: n.abedin@larc.nasa.gov
AF: NASA Langley Research Center, MS 468, Hampton, VA 23681 United States
AU: Refaat, T F
EM: fn.t.f.refaat@larc.nasa.gov
AF: Science and Technology Corp., 10 Basil Sawyer Dr, Hampton, VA 23666 United States
AU: Singh, U N
EM:
AF: NASA Langley Research Center, MS 468, Hampton, VA 23681 United States
AB: NASA Langley Research Center is developing a CO2 profiling Differential Absorption Lidar System operating in the 2.05 micron region. Data from this system can provide vertically resolved CO2 profiles over long continuous observation intervals that can alleviate a primary limit in our ability to derive regional terrestrial CO2 fluxes. Development of this system follows the development of high power, pulsed, narrow bandwidth, tunable lasers with the ability to lock onto optimum absorption lines for the measurement of CO2 profiles. The measurement precision of an existing DIAL system will be enhanced using recently acquired high quantum efficiency, high-gain, and high signal-to-noise ratio detectors and a large collection area telescope. We plan to integrate the ground-based DIAL system and evaluate and optimize its performance before it will be deployed in a field experiments. Well- calibrated, in situ infrared gas analyzers, on the ground and on aircraft, will be used to evaluate the DIAL system. We anticipate that the DIAL system will achieve 1% (3 ppm) absolute accuracy and 0.5% (1.5 ppm) precision while measuring CO2 mixing ratios with 1 km vertical resolution and 30 minute temporal resolution up to range of 4 to 5 km. This system can be used as a validation tool of the OCO (Orbiting Carbon Observatory). Data from the semi-continuous CO2 profiling DIAL system can be used in concert with in situ measurements to enable more precise derivation of regional CO2 fluxes. Examples of CO2 measurements with the existing system will be presented along with the progress made in developing the new system and its projected capability.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0365 Troposphere: composition and chemistry
DE: 0428 Carbon cycling (4806)
DE: 0429 Climate dynamics (1620)
DE: 0480 Remote sensing
SC: Biogeosciences [B]
MN: Fall Meeting 2005