Boundary Layer Notes 5. Observational Techniques. Observational Techniques. Sources: Kaimal & Finnegan, Atmospheric Boundary Layer Flows: their structure and measurement, Oxford University Press, 1994 In situ techniques: Important boundary layer measurements:
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Sources: Kaimal & Finnegan, Atmospheric Boundary Layer Flows: their structure and measurement, Oxford University Press, 1994
T, u, v, w, q, trace gases (e.g. CO2, CH4)
We need to measure both mean quantities and fluctuations.
For means, standard measurement techniques are acceptable (thermistors, wind vanes, cup-anemometers, propellers, hygristors, psychrometer, dew-point hygrometer)
Remote sensing—fine for mean state of boundary layer, not for direct flux measurements.
Derive speed of sound:
Sketch anemometer layout, and derive:
Applied Technologies. Data rates range from 10/s to 1/s.f
Funny-looking one is an open cell, for eddy-correlation measurements.