Editorial Type:
Article
Article Type:
Research Article

Can CO2 Turbulent Flux Be Measured by Lidar? A Preliminary Study

Fabien Gibert * Laboratoire de Météorologie Dynamique, Institut Pierre et Simon Laplace, Ecole Polytechnique, Palaiseau, France
Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania

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Grady J. Koch NASA Langley Research Center, Hampton, Virginia

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Jeffrey Y. Beyon NASA Langley Research Center, Hampton, Virginia

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Timothy W. Hilton Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania

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Kenneth J. Davis Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania

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Arlyn Andrews NOAA/Earth System Research Laboratory, Boulder, Colorado

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Pierre H. Flamant * Laboratoire de Météorologie Dynamique, Institut Pierre et Simon Laplace, Ecole Polytechnique, Palaiseau, France

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Upendra N. Singh NASA Langley Research Center, Hampton, Virginia

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Print Publication:
01 Mar 2011
DOI:
https://doi.org/10.1175/2010JTECHA1446.1
Page(s):
365–377
Restricted access

Abstract

The vertical profiling of CO2 turbulent fluxes in the atmospheric boundary layer (ABL) is investigated using a coherent differential absorption lidar (CDIAL) operated nearby a tall tower in Wisconsin during June 2007. A CDIAL can perform simultaneous range-resolved CO2 DIAL and velocity measurements. The lidar eddy covariance technique is presented. The aims of the study are (i) an assessment of performance and current limitation of available CDIAL for CO2 turbulent fluxes and (ii) the derivation of instrument specifications to build a future CDIAL to perform accurate range-resolved CO2 fluxes. Experimental lidar CO2 mixing ratio and vertical velocity profiles are successfully compared with in situ sensors measurements. Time and space integral scales of turbulence in the ABL are addressed that result in limitation for time averaging and range accumulation. A first attempt to infer CO2 fluxes using an eddy covariance technique with currently available 2-μm CDIAL dataset is reported.

Corresponding author address: Fabien Gibert, IPSL/LMD Ecole Polytechnique, Palaiseau, France. Email: fabien.gibert@lmd.polytechnique.fr

Abstract

The vertical profiling of CO2 turbulent fluxes in the atmospheric boundary layer (ABL) is investigated using a coherent differential absorption lidar (CDIAL) operated nearby a tall tower in Wisconsin during June 2007. A CDIAL can perform simultaneous range-resolved CO2 DIAL and velocity measurements. The lidar eddy covariance technique is presented. The aims of the study are (i) an assessment of performance and current limitation of available CDIAL for CO2 turbulent fluxes and (ii) the derivation of instrument specifications to build a future CDIAL to perform accurate range-resolved CO2 fluxes. Experimental lidar CO2 mixing ratio and vertical velocity profiles are successfully compared with in situ sensors measurements. Time and space integral scales of turbulence in the ABL are addressed that result in limitation for time averaging and range accumulation. A first attempt to infer CO2 fluxes using an eddy covariance technique with currently available 2-μm CDIAL dataset is reported.

Corresponding author address: Fabien Gibert, IPSL/LMD Ecole Polytechnique, Palaiseau, France. Email: fabien.gibert@lmd.polytechnique.fr

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Cover Journal of Atmospheric and Oceanic Technology
Journal of Atmospheric and Oceanic Technology

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