Comments on the Synergism Between the Analytic Planetary Boundary-Layer Model and Remote Sensing Data |
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Authors: | Email author" target="_blank">R?A?BrownEmail author |
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Institution: | (1) Department of Atmospheric Sciences, University of Washington, Seattle, WA, 98195, U.S.A |
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Abstract: | This paper is adapted from a presentation at the session of the European Geophysical Society meeting in 2002 honouring Joost
Businger. It documents the interaction of the non-linear planetary boundary-layer (PBL) model (UW-PBL) and satellite remote
sensing of marine surface winds from verification and calibration studies for the sensor model function to the current state
of verification of the model by satellite data. It is also a personal history where Joost Businger had seminal input to this
research at several critical junctures. The first scatterometer in space was on SeaSat in 1978, while currently in orbit there
are the QuikSCAT and ERS-2 scatterometers and the WindSat radiometer. The volume and detail of data from the scatterometers
during the past decade are unprecedented, though the value of these data depends on a careful interpretation of the PBL dynamics.
The model functions (algorithms) that relate surface wind to sensor signal have evolved from straight empirical correlation
with simple surface-layer 10-m winds to satellite sensor model functions for surface pressure fields. A surface stress model
function is also available. The validation data for the satellite model functions depended crucially on the PBL solution.
The non-linear solution for the flow of fluid in the boundary layer of a rotating coordinate system was completed in 1969.
The implications for traditional ways of measuring and modelling the PBL were huge and continue to this day. Unfortunately,
this solution replaced an elegant one by Ekman with a stability/finite perturbation equilibrium solution. Consequently, there
has been great reluctance to accept this solution. The verification of model predictions has been obtained from the satellite
data. |
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Keywords: | Non-linear PBL model Organised large eddies Planetary boundary layer Rolls Satellite winds |
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