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Particle fluxes above forests: observations, methodological considerations and method comparisons.

S C Pryor¹, S E Larsen, L L Sørensen

¹Atmospheric Science Program, Department of Geography, Indiana University, 701 E. Kirkwood Avenue, Bloomington, IN 47405, USA. spryor@indiana.edu

Environmental Pollution (Barking, Essex : 1987)

|September 4, 2007

Summary

This study compared micrometeorological methods for measuring particle number flux over forests. Eddy covariance and relaxed eddy accumulation (REA) methods showed strong agreement in particle flux measurements.

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Area of Science:

Atmospheric Science
Forest Ecology
Environmental Monitoring

Background:

Accurate measurement of particle number flux above forest canopies is crucial for understanding atmospheric processes.
Micrometeorological methods offer potential for continuous, in-situ flux determination.

Purpose of the Study:

To test, evaluate, and compare different micrometeorological techniques for quantifying particle number flux.
To assess the reliability and inter-method agreement of particle flux measurements above a forest ecosystem.

Main Methods:

Utilized eddy covariance, relaxed eddy accumulation (REA), co-spectral, and dissipation methods.
Collected half-hour average particle number flux data above a Danish broad-leaved forest.

Main Results:

Eddy covariance yielded median particle number fluxes of -1.6x10^6 m^-2 s^-1, with significant statistical uncertainties.
Particle number fluxes from REA were highly correlated and similar in magnitude to eddy covariance.
Co-spectral and dissipation methods correlated with eddy covariance but showed higher absolute flux magnitudes.

Conclusions:

Eddy covariance and REA are reliable and comparable methods for forest particle number flux estimation.
Statistical uncertainties necessitate careful interpretation of particle flux data, with many values not statistically significant.
Discrepancies in magnitude highlight the need for method-specific considerations in flux analysis.