The Turbulent Pressure Spectrum Within the Roughness Sublayer of a Subarctic Forest Canopy

Aslan, Toprak; Katul, Gabriel G.; Aurela, Mika

doi:10.1029/2024JD042206

The Turbulent Pressure Spectrum Within the Roughness Sublayer of a Subarctic Forest Canopy

Journal Article · Tue Feb 18 00:00:00 EST 2025 · Journal of Geophysical Research. Atmospheres

DOI:https://doi.org/10.1029/2024JD042206· OSTI ID:3006746

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Finnish Meteorological Inst., Helsinki (Finland)
Duke Univ., Durham, NC (United States)

The turbulent static pressure spectrum E_pp(k_x) as a function of longitudinal wavenumber k_x in the roughness sublayer of forested canopies is of interest to a plethora of problems such as pressure transport in the turbulent kinetic energy budget, pressure pumping from snow or forest floor, and coupling between flow within and above canopies. Long term static pressure measurements above a sub-arctic forested canopy for near-neutral conditions during the winter and spring were collected and analyzed for three snow cover conditions: trees and ground covered with snow, trees are snow free but the ground is covered with snow, and snow free cover. In all three cases, it is shown that E_pp(k_x) obeys the attached eddy hypothesis at low wavenumbers (1/δ < k_x < 1/z) —with E_pp(k_x) ∝ u$$^4_*$$k$$^{-1}_x$$ and Kolmogorov scaling in the inertial subrange at higher wavenumbers—with E_pp(k_x) ∝ ϵ^4/3 k_x^-7/3, where u_* is the friction velocity at the canopy top, is the mean turbulent kinetic energy dissipation rate, z is the distance from the snow top, and is the boundary layer depth. The implications of these two scaling laws to the normalized root-mean squared pressure C_p = o_p/u$$^2_*$$ and its newly proposed logarithmic scaling with normalized wall-normal distance z/δ are discussed for snow covered and snow free vegetation conditions. The work here also shows that k$$^{-1}_x$$ the in the E_pp(k_x) appears more extensive and robust than its longitudinal velocity counterpart.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0022072

OSTI ID:: 3006746

Journal Information:: Journal of Geophysical Research. Atmospheres, Journal Name: Journal of Geophysical Research. Atmospheres Journal Issue: 4 Vol. 130; ISSN 2169-8996; ISSN 2169-897X

Publisher:: American Geophysical Union; WileyCopyright Statement

Country of Publication:: United States

Language:: English

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