If vertical turbulent fluxes are computed from time series collected at a fixed point, it is assumed that the temporal mean vertical velocity is zero. This paper discusses the validity of this assumption by analysis of time series of the vertical wind velocity collected with sonic anemometers at four different heights ranging from 3 to 180 m from the Cabauw tower. It is shown that even for averaging times of 1 hour, the mean vertical velocity can have values of the order of 10 cm/s.
|Title of host publication||19th Symposium on Boundary Layers and Turbulence, American Meteorological Society, 2-6 August 2010, Keystone, Colorado, USA|
|Place of Publication||Boston|
|Publication status||Published - 2010|
|Event||19th Symposium on Boundary Layers and Turbulence - Keystone, United States|
Duration: 1 Aug 2010 → 6 Aug 2010
|Conference||19th Symposium on Boundary Layers and Turbulence|
|Period||1/08/10 → 6/08/10|