Nocturnal boundary-layer height: Observations by acoustic sounders and predictions in terms of surface-layer parameters |
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Authors: | Darko Koracin Ruwim Berkowicz |
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Institution: | 1. National Agency of Environmental Protection, Air Pollution Laboratory, Ris? National Laboratory, DK-4000, Roskilde, Denmark
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Abstract: | Acoustic sounder measurements of the stable boundary-layer height taken during the EPRI Plume Model Validation and Development
Project experiment are examined. Comparison of simultaneous measurements by two sodars located 15 km apart shows good agreement.
Several widely used diagnostic formulas for estimation of the boundary-layer height, based on wind speed and surface-layer
parameters, such as friction velocity and Monin-Obukhov length, are tested against the sodar data. Of these, best performance
is found using a simple linear relationship with friction velocity or, alternatively, wind speed at 10 m height. No evidence
is found to support the more often used Zilitinkevich (1972) formula. Tests using selected data from the Cabauw site in the
Netherlands confirm the results found on the basis of EPRI data. |
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