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- Title
Surface Layer Turbulence Measurements during a Frontal Passage.
- Authors
Piper, M.; Lundquist, Julie K.
- Abstract
Very little is known about the nature of turbulence in the transition zone of a synoptic-scale cold front, especially at the dissipative scales. Lacking this knowledge, accurate models of surface frontogenesis are compromised. To address this problem, high-frequency measurements from sonic and hot-wire anemometers are used to analyze the finescale turbulence in the atmospheric surface layer (ASL) within a cold front observed in the MICROFRONTS field experiment. To quantify the turbulence in the front, velocity spectra and dissipation rates are calculated as functions of time and stability in the ASL. The normalized first and second moments of the one-dimensional velocity spectrum conform to the scaling suggested by Kolmogorov's equilibrium hypotheses, even during the intense turbulence associated with the frontal passage. The spectra compare well with other data collected at high Reλ in the ASL, but not as well with a recent model of the dissipative range of turbulence. Dissipation rate ε is calculated with one direct and two indirect techniques. The calculations from the different techniques compare well with one another and, when nondimensionalized, with a historical expression for dissipation rate as a function of ASL stability. The magnitude of the dissipation rate increases by an order of magnitude to a maximum value of ∼1.2 m2 s-3 during the frontal passage compared to prefrontal values of ∼0.05 m2 s-3; the latter is typical for a slightly stable nighttime boundary layer over land. These results can be used in assessing the effects of turbulence in traditional semigeostrophic models of frontal collapse. The dissipation rate calculations may be of particular use to modelers.
- Subjects
TURBULENCE; HOT-wire anemometer; ENERGY dissipation; METEOROLOGICAL instruments; FLUID dynamics; ATMOSPHERIC boundary layer
- Publication
Journal of the Atmospheric Sciences, 2004, Vol 61, Issue 14, p1768
- ISSN
0022-4928
- Publication type
Article
- DOI
10.1175/1520-0469(2004)061<1768:SLTMDA>2.0.CO;2