HR: 08:45h
AN: A41E-04    [Abstracts]
TI: Flux measurements of atmospheric CO2 by Lidar: from the micro to the regional scale
AU: Koch, G
AF: NASA Langley Research Center, Laser Remote Sensing Branch,MS 468, Hampton, VA 23681, United States
AU: * Gibert, F
AF: The Pennsylvania State University, Department of Meteorology, Walker Building, University Park, PA 16802, United States
AU: Davis, K
AF: The Pennsylvania State University, Department of Meteorology, Walker Building, University Park, PA 16802, United States
AU: Ismail, S
AF: NASA Langley Research Center, Laser Remote Sensing Branch,MS 468, Hampton, VA 23681, United States
AU: Singh, U
AF: NASA Langley Research Center, Laser Remote Sensing Branch,MS 468, Hampton, VA 23681, United States
AB: A mechanistic understanding of the global carbon cycle requires quantification of terrestrial ecosystem CO2 fluxes at regional scales. In this paper, we analyze the potential of a Doppler DIAL system to make flux measurements of atmospheric CO2 using the eddy-covariance and boundary layer budget methods and present results from a ground based experiment. In June 2007, a field experiment combining a 2-µm Doppler Heterodyne Differential Absorption Lidar (HDIAL) and in-situ sensors of a 447-m tall tower (WLEF) took place in Wisconsin. The HDIAL measures simultaneously: 1) CO2 mixing ratio, 2) atmosphere structure via aerosol backscatter and 3) radial velocity. We demonstrate how to synthesize these data into regional flux estimates. Lidar-inferred fluxes are compared with eddy-covariance fluxes obtained in-situ at 396m AGL from the tower. In cases where the lidar was not yet able to measure the fluxes with acceptable precision, we discuss possible modifications to improve system performance.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0394 Instruments and techniques
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 1610 Atmosphere (0315, 0325)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting