Analysis of turbulent exchange and coherent structures in the stable atmospheric boundary layer based on tower observations

摘要

Using data collected at the Spanish low troposphere research centre CIBA\ud(Centro de Investigación de la Baja Atmósfera) and at the Cabauw Experimental Site for\udAtmospheric Research (CESAR) in the Netherlands, we analysed the most significant\udfeatures of different coherent structures occurring in the stable atmospheric boundary layer.\udIn particular, we used both the Reynolds and wavelet methods to analyse a solitary wave, a\udgravity wave, a density current and a low-level jet. For each of these structures, we found\udthat wavelet analysis had the capacity to distinguish the different scales involved in these\udevents due to the different timing and heights of the thermal instabilities and downdrafts\udassociated with the disturbances. In addition, the wavelet method highlights the different\udroles of turbulence and coherent structures in the transfer of heat, moisture and CO2 in the\udnocturnal boundary layer.