NDLI: A study of a fair weather boundary layer in TOGA-COARE: Parameterization of surface fluxes in large scale and regional models for light wind conditions

Content Provider	Springer Nature Link
Author	Mondon, S. Redelsperger, J.L.
Copyright Year	1998
Abstract	The study focuses on a way to parameterize the effect of subgrid scale convective motions on surface fluxes in large scale and regional models for the case of light surface winds. As previously proposed, these subgrid effects are assumed to scale with the convection intensity through the relationship: $$\overline U ^2 = U_0^2 + (\beta w_* )^2$$ where $$\overline U$$ is the mean velocity of the wind, U0 the velocity of the mean wind, w* the free convection velocity, and β an empirical coefficient to be determined. Both observations and numerical simulation are presently used to determine the free convection coefficient β.Large eddy simulation of a fair weather convective boundary layer case observed during TOGA-COARE is performed. Comparisons between observations and the simulation of surface properties and vertical profiles in the planetary boundary layer are presented. The simulated vertical turbulent fluxes of heat, moisture and buoyancy range well within estimates from aircraft measurements.The most important result is that the ‘true’ free convection coefficient β, directly estimated from simulation, leads to a value of 0.65, smaller than the ones estimated from temporal and spatial variances. Using observations and simulation, estimates of β from temporal and spatial variances are obtained with similar values ≈ 0.8. From both theoretical derivations and numerical computations, it is shown that estimates of the ‘true’ β from variances are possible but only after applying a correction factor equal to 0.8. If this correction is not used, β is overestimated by about 25%. The time and space sampling problem is also addressed in using numerical simulations.
Starting Page	47
Ending Page	76
Page Count	30
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	88
Issue Number	1
e-ISSN	15731472
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Meteorology/Climatology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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