Estudo Das Estruturas Coerentes Na Cla Clara Por Radar Doppler

The evaluation of the respective role played by the coherent structures and the turbulence in the vertical transport within<br>the atmospheric boundary layer was the scientific objective of the TRAC experiment, the experimental framework of this<br>study, that made use in June 1993 of coordinated aircraft-radar measurements. The analyzed cases of ABL showed that<br>the radar was able to provide a coherent and continuous representation of the meteorological fields over a horizontal<br>range of several tens of kilometers and vertically up to 2.5 km, i.e., well beyond the top of ABL. Coherent structures<br>appeared as a common feature of the ABL under study and not as an exception. From radar measurements we found in<br>particular that turbulent scales of the inertial sub-range were modulated by the coherent structures. The capability of the<br>detection of weather cumulis located at the top of the ABL show that the radar is able to provide a description of the<br>entire ABL including the processes in the entrainement zone.