Abstract:
|
Using data collected at the Spanish low troposphere research centre CIBA
(Centro de Investigación de la Baja Atmósfera) and at the Cabauw Experimental Site for
Atmospheric Research (CESAR) in the Netherlands, we analysed the most significant
features of different coherent structures occurring in the stable atmospheric boundary layer.
In particular, we used both the Reynolds and wavelet methods to analyse a solitary wave, a
gravity wave, a density current and a low-level jet. For each of these structures, we found
that wavelet analysis had the capacity to distinguish the different scales involved in these
events due to the different timing and heights of the thermal instabilities and downdrafts
associated with the disturbances. In addition, the wavelet method highlights the different
roles of turbulence and coherent structures in the transfer of heat, moisture and CO2 in the
nocturnal boundary layer. |