
Publications [#281506] of Gabriel G. Katul
Papers Published
 Cava, D; Katul, GG, On the scaling laws of the velocityscalar cospectra in the canopy sublayer above tall forests,
Boundary Layer Meteorology, vol. 145 no. 2
(May, 2012),
pp. 351367, Springer Nature, ISSN 00068314 [doi]
(last updated on 2022/05/20)
Abstract: The scaling laws of the vertical (Fwc) and longitudinal (Fuc) velocityscalar cospectra within the inertial subrange are explored using dimensional arguments and a simplified cospectral budget in the canopy sublayer above three distinct forested ecosystems. The cospectral budget was shown to be consistent with plausible scaling laws originating from dimensional considerations. Using the analytical solution to the novel cospectral budget, it was shown that Fwc(k) and Fuc(k) are governed by the linear superposition of two terms that scale as k−2/3−α and k−β, where k is the wavenumber, −α is the exponent of the velocity spectrum, and β(≥ 7/3) depends on the ratio of the similarity constants for the pressurescalar covariance and the flux transport terms. It was also demonstrated that, when the magnitude of the mean scalar concentration gradient is large, the k−2/3−α term dominates the velocityscalar cospectral budget. For such a case, correcting for biases emerging from high frequency losses in eddycovariance scalar flux measurements can be readily formulated by using the measured velocity spectral exponent in the inertial subrange.
