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Intrinsic Constraints on Asymmetric Turbulent Transport of Scalars Within the Constant Flux Layer of the Lower Atmosphere

Publication ,  Journal Article
Li, D; Katul, GG; Liu, H
Published in: Geophysical Research Letters
February 28, 2018

A widely used assumption in boundary layer meteorology is the z independence of turbulent scalar fluxes Fs throughout the atmospheric surface layer, where z is the distance from the boundary. This assumption is necessary for the usage of Monin-Obukhov Similarity Theory and for the interpretation of eddy covariance measurements of Fs when using them to represent emissions or uptake from the surface. It is demonstrated here that the constant flux assumption offers intrinsic constraints on the third-order turbulent transport of Fs in the unstable atmospheric surface layer. When enforcing z independence of Fs on multilevel Fs measurements collected above different surface cover types, it is shown that increasing instability leads to a novel and universal description of (i) the imbalance between ejecting and sweeping eddy contributions to Fs and (ii) the ratio formed by a dimensionless turbulent transport of Fs and a dimensionless turbulent transport of scalar variance. When combined with structural models for the turbulent transport of Fs, these two findings offer a new perspective on “closing” triple moments beyond conventional gradient diffusion schemes. A practical outcome is a diagnostic of the constant flux assumption from single-level Fs measurements.

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Published In

Geophysical Research Letters

DOI

EISSN

1944-8007

ISSN

0094-8276

Publication Date

February 28, 2018

Volume

45

Issue

4

Start / End Page

2022 / 2030

Related Subject Headings

  • Meteorology & Atmospheric Sciences
 

Citation

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Li, D., Katul, G. G., & Liu, H. (2018). Intrinsic Constraints on Asymmetric Turbulent Transport of Scalars Within the Constant Flux Layer of the Lower Atmosphere. Geophysical Research Letters, 45(4), 2022–2030. https://doi.org/10.1002/2018GL077021
Li, D., G. G. Katul, and H. Liu. “Intrinsic Constraints on Asymmetric Turbulent Transport of Scalars Within the Constant Flux Layer of the Lower Atmosphere.” Geophysical Research Letters 45, no. 4 (February 28, 2018): 2022–30. https://doi.org/10.1002/2018GL077021.
Li D, Katul GG, Liu H. Intrinsic Constraints on Asymmetric Turbulent Transport of Scalars Within the Constant Flux Layer of the Lower Atmosphere. Geophysical Research Letters. 2018 Feb 28;45(4):2022–30.
Li, D., et al. “Intrinsic Constraints on Asymmetric Turbulent Transport of Scalars Within the Constant Flux Layer of the Lower Atmosphere.” Geophysical Research Letters, vol. 45, no. 4, Feb. 2018, pp. 2022–30. Scopus, doi:10.1002/2018GL077021.
Li D, Katul GG, Liu H. Intrinsic Constraints on Asymmetric Turbulent Transport of Scalars Within the Constant Flux Layer of the Lower Atmosphere. Geophysical Research Letters. 2018 Feb 28;45(4):2022–2030.
Journal cover image

Published In

Geophysical Research Letters

DOI

EISSN

1944-8007

ISSN

0094-8276

Publication Date

February 28, 2018

Volume

45

Issue

4

Start / End Page

2022 / 2030

Related Subject Headings

  • Meteorology & Atmospheric Sciences