10A.2
Reasons for the breakdown of Monin-Obukhov similarity theory above rough surfaces
Jan H. Schween, University of Cologne, Cologne, NRW, Germany
Since Thome (1971) it is known that abouve rough surfaces gradients are
smaller than predicted by Monin-Obkhov similarity theory (MO-theory). In 1989 Raupach
proposed with the localized near field theory (LNF) a lagrangian approach to model
source distributions in plant canopies. This theory can be used to derive a
general formulation for profiles within and above plant canopies. Comparing
such profiles with profiles predicted by MO-theory gives insight into the
mechanisms leading to the deviation from MO-theory. These are mainly the
enhacement of turbulence which reduces gradients and the near field effects
in turbulence which enhance gradients.
Session 10A, LAND-SURFACE-PBL COUPLING—II
Wednesday, 11 June 2008, 10:30 AM-12:15 PM, Aula Magna Vänster
Previous paper Next paper