Turbulence structure in temperature inversions and in convection fields as observed by doppler sodar |
| |
Authors: | Weill A Baudin F Goutorbe J P Van Grunderbeeck P Leberre P |
| |
Institution: | (1) CNET/CNRS/CRPE 3 av. de la République, 92131 Issy-les-Moulineaux, France;(2) EERM, 73–77, rue de Sèvres, 92100 Boulogne, France |
| |
Abstract: | The structure of turbulence in an inversion layer and in an homogeneous convective field of the planetary boundary layer is
described. In the first part of the paper, we validate the sodar estimates of turbulent dissipation, by using measurements
with an hot-wire anemometric system in situ. Limitations of an ε measurement technique using structure function calculations
are given, taking account of atmospheric properties and acoustic Doppler instrumental effects.
By comparison between isopleths of backscattering intensity and of turbulent dissipation rates, we observe that in the early
morning, turbulence is advected by mechanical turbulence generated by wind shear. The same mechanism seems to be operating
in the case of an inversion layer capping thermal instability, when the convective activity is not too greatly developed.
A turbulent kinetic energy budget is examined using aircraft, sodar, and tower measurements. This indicates a constant turbulent
dissipation profile through a deep convective layer. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|