Monday, 2 August 2010: 1:30 PM
Crestone Peak III & IV (Keystone Resort)
Presentation PDF (297.2 kB)
The transport of heat, water vapor and carbon dioxide in the stable boundary layer between 30 and 60 meters is examined with data from a tall tower in a complex landscape. Three stable nights characterized by a low-level jet with core between 300-500 meters above ground level were studied with a wavelet analysis of the wind speeds, temperature and mixing ratios.
All relevant quantities exhibited significant energy with periods of 30 min to 2 hours. Net transport was evaluated by comparing the flux in the planar fit coordinate system for an averaging period of >4 hours with one-hour averages, and with a wavelet analysis of the time rate of change of the layer-mean quantities.
It was found that net transport was significantly less than suggested by the covariances, but that eddies of 30-120 min periods were nevertheless significant contributors to the net transport. Transport at 30m was found to alternate between the behavior seen at 60m (long period, episodic)and continuous turbulence.
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