Simple Diagnostic Expressions For The Stable And Unstable
Atmospheric Boundary Layer Height
Author(s)
S.M. Joffre & M. Kangas
Abstract
Simple diagnostic expressions for the stable and
unstable atmospheric boundary layer height
S.M. Joffre & M. Kangas
Finnish Meteorological Institute, Finland
Abstract
We present here a new heuristic framework for the variability of the atmospheric
boundary layer (ABL) height h based on an extended concept of the similarity
theory retaining non-local effects. Based on several sets of well-known data
(Wangara, JASIN, ICE-77), the locus of variability of h in the phase-space
determined from this similarity framework points to a new combination for the
most relevant scales affecting the ABL height. We show that the most likely
length scales to explain the variability of the ABL height are the classical Monin-
Obukhov length L and the background static stratification scale L=u^/N, where
u* is the friction velocity and TV the Brunt- Vaisala frequency above the ABL.
This concept is applied to a new set of data obtained above a high-latitude
forested site, i.e., very different from the a
Keywords
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