Airborne eddy correlation gas flux measurements: design criteria for optical techniques

John A. Ritter; Glen William Sachse; Bruce E. Anderson

doi:10.1117/12.140193

12 February 1993 Airborne eddy correlation gas flux measurements - Design criteria for optical techniques

John A. Ritter, Glen William Sachse, Bruce E. Anderson

Proceedings Volume 1715, Optical Methods in Atmospheric Chemistry; (1993) https://doi.org/10.1117/12.140193
Event: Environmental Sensing '92, 1992, Berlin, Germany

Abstract

Although several methods exist for the determination of the flux of an atmospheric species, the airborne eddy correlation method has the advantage of providing direct flux measurements that are representative of regional spatial domains. The design criteria pertinent to the construction of chemical instrumentation suitable for use in airborne eddy correlation flux measurements are discussed. A brief overview of the advantages and limitations of the current instrumentation used to obtain flux measurements for CO, CH4, O3, CO2, and water vapor are given. The intended height of the measurement within the convective boundary layer is also shown to be an important design criteria. The sensitivity, or resolution, which is required in the measurement of a scalar species to obtain an adequate species flux measurement is discussed. The relationship between the species flux resolution and the more commonly stated instrumental resolution is developed and it is shown that the standard error of the flux estimate is a complicated function of the atmospheric variability and the averaging time that is used. The use of the recently proposed intermittent sampling method to determine the species flux is examined. The application of this technique may provide an opportunity to expand the suite of trace gases for which direct flux measurements are possible.

Citation Download Citation

John A. Ritter, Glen William Sachse, and Bruce E. Anderson "Airborne eddy correlation gas flux measurements - Design criteria for optical techniques", Proc. SPIE 1715, Optical Methods in Atmospheric Chemistry, (12 February 1993); https://doi.org/10.1117/12.140193

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