stability.correction {bigleaf}

Integrated Stability Correction Functions for Heat and Momentum

Description

dimensionless stability functions needed to correct deviations from the exponential wind profile under non-neutral conditions.

Usage

stability.correction(zeta, formulation = c("Dyer_1970", "Businger_1971"))

Arguments

zeta

Stability parameter zeta (-)

formulation

Formulation for the stability function. Either "Dyer_1970", or "Businger_1971"

Details

The functions give the integrated form of the universal functions. They depend on the value of the stability parameter \zeta, which can be calculated from the function stability.parameter. The integration of the universal functions is:

\psi = -x * zeta

for stable atmospheric conditions (\zeta >= 0), and

\psi = 2 * log( (1 + y) / 2)

for unstable atmospheric conditions (\zeta < 0).

The different formulations differ in their value of x and y.

Value

a data.frame with the following columns:

psi_h

the value of the stability function for heat and water vapor (-)

psi_m

the value of the stability function for momentum (-)

References

Dyer, A.J., 1974: A review of flux-profile relationships. Boundary-Layer Meteorology 7, 363-372.

Dyer, A. J., Hicks, B.B., 1970: Flux-Gradient relationships in the constant flux layer. Quart. J. R. Meteorol. Soc. 96, 715-721.

Businger, J.A., Wyngaard, J. C., Izumi, I., Bradley, E. F., 1971: Flux-Profile relationships in the atmospheric surface layer. J. Atmospheric Sci. 28, 181-189.

Paulson, C.A., 1970: The mathematical representation of wind speed and temperature profiles in the unstable atmospheric surface layer. Journal of Applied Meteorology 9, 857-861.

Foken, T, 2008: Micrometeorology. Springer, Berlin, Germany.

Examples

zeta <- seq(-2,0.5,0.05)
stability.correction(zeta)
stability.correction(zeta,formulation="Businger_1971")