Prof. Robert M. Kerr
University of Warwick
Evidence for upscale energy transfer from
the atmospheric boundary layer
Abstract:
The longitudinal structure function
and the longitudinal
and transverse second order structure functions,
and
are determined from atmospheric measurements and simulations.
The atmospheric data is from scatterometer measurements of capillary
waves on the ocean surface and can be interpreted as
velocities in the tropical boundary layer over the ocean.
The simulation is of classical Rayleigh-Bénard convection in a wide
box.
The observational data finds that
is positive in the east-west direction where there is a mean flow
and negative in the north-south direction.
For the wide box,
obeys
in the center for
where
is the height of the box, following the expectation
for 3D turbulence. This form is roughly followed for small
even
in the boundary layer. However, at larger scales in the
boundary layer
obeys
, as would be expected for 2D
turbulence.
Similar changes are seen in the second order structure functions.
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Zeit: | Freitag,
05. Dezember 2003, 16.00 (Kaffee/Tee um 15.30 p.m.) |
|
Ort: | FU Berlin, Arnimalle
e 2-6, Raum 032 im EG
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