Low-Frequency Effects on Eddy Covariance Fluxes under the Influence of a Low-Level Jet

Prabha, Thara V.; Leclerc, Monique Y.; Karipot, Anandakumar; Hollinger, David Y.

doi:10.1175/jam2461.1

Low-Frequency Effects on Eddy Covariance Fluxes under the Influence of a Low-Level Jet

Journal Article · Thu Mar 01 04:00:00 EST 2007 · Journal of Applied Meteorology and Climatology

DOI:https://doi.org/10.1175/jam2461.1· OSTI ID:929552

Prabha, Thara V. ^[1]; Leclerc, Monique Y. ^[2]; Karipot, Anandakumar ^[2]; Hollinger, David Y. ^[3]

The University of Georgia, Griffin, Georgia; The University of Georgia
The University of Georgia, Griffin, Georgia
U.S. Department of Agriculture Forest Service, Durham, New Hampshire

Turbulent bursts observed over a tall forest canopy during the initiation of a nocturnal low-level jet (LLJ) are studied with the help of wavelet analysis. The burst of turbulence is observed in response to a shear instability associated with the initiation of LLJ. Turbulent kinetic energy, momentum, and CO2-rich cold air are transferred downward by large eddies with length scales that are higher than the LLJ height. Microfronts are observed over the canopy as a secondary instability that enhances the mixing processes within and above the canopy. The scale-dependent wavelet correlation analysis reveals that countergradient fluxes result from low frequencies, whereas cogradient flux is associated with high-frequency turbulent motions. The countergradient flux is initially noted at low frequencies, and, through coherent motions, it is transferred to smaller scales with a nearly 20-min delay. The countergradient flux dominates at the initiation of the event and reduces net flux, whereas enhanced cogradient flux at the decay of the event increases the net flux. The wavelet correlation coefficient corresponding to cogradient and countergradient fluxes is applied to segregate three regions of the spectra corresponding to “turbulent,” “coherent,” and “noncoherent” large scales. These findings are used to examine the implications on eddy covariance flux measurements.

Research Organization:: Univ. of Georgia, Athens, GA (United States)

Sponsoring Organization:: USDOE Office of Energy Research (ER)

DOE Contract Number:: FG02-00ER63024

OSTI ID:: 929552

Report Number(s):: DOE/ER63024-12

Journal Information:: Journal of Applied Meteorology and Climatology, Journal Name: Journal of Applied Meteorology and Climatology Journal Issue: 3 Vol. 46; ISSN 1558-8424

Publisher:: American Meteorological Society

Country of Publication:: United States

Language:: English

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