Relaxed Eddy Accumulation Outperforms Monin‐Obukhov Flux Models Under Non‐Ideal Conditions

Zahn, Einara; Bou‐Zeid, Elie; Dias, Nelson Luís

doi:10.1029/2023gl103099

i

Relaxed Eddy Accumulation Outperforms Monin‐Obukhov Flux Models Under Non‐Ideal Conditions

Supporting Files

2023
By Zahn, Einara ; Bou‐Zeid, Elie ; Dias, Nelson Luís

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Journal Title:

Geophysical Research Letters
Personal Author:

Zahn, Einara ; Bou‐Zeid, Elie ; Dias, Nelson Luís
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

The Monin‐Obukhov Similarity Theory (MOST) links turbulent statistics to surface fluxes through universal functions. Here, we investigate its performance over a large lake, where none of its assumptions (flat homogeneous surface) are obviously violated. We probe the connection between the variance budget terms and departure from the nondimensional flux‐variance function for CO2, water vapor, and temperature. Our results indicate that both the variance storage and its vertical transport affect MOST, and these terms are most significant when small fluxes and near neutral conditions were prevalent. Such conditions are common over lakes and oceans, especially for CO2, underlining the limitation of using any MOST‐based methods to compute small fluxes. We further show that the relaxed eddy accumulation (REA) method is more robust and less sensitive to storage and transport, adequately reproducing the eddy‐covariance fluxes even for the smallest flux magnitudes. Therefore, we recommend REA over MOST methods for trace‐gas flux estimation.
Keywords:

General Earth And Planetary Sciences Geophysics General Earth And Planetary Sciences General Earth And Planetary Sciences
Source:

Geophysical Research Letters, 50(7)
DOI:

https://doi.org/10.1029/2023gl103099
ISSN:

0094-8276 ; 1944-8007
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4320123
License:

https://creativecommons.org/licenses/by-nc-nd/4.0/
Rights Information:

CC BY-NC-ND
Compliance:

Library
Main Document Checksum:

urn:sha256:a0edcb39dd3017d4160701531012cb632448c7d28c148df5bcf8983d8db4c328
Download URL:

https://repository.library.noaa.gov/view/noaa/59384/noaa_59384_DS1.pdf
File Type:

[PDF - 1.38 MB ]

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