Physics
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2828...97d&link_type=abstract
Proc. SPIE Vol. 2828, p. 97-107, Image Propagation through the Atmosphere, J. C. Dainty; Luc R. Bissonnette; Eds.
Physics
Scientific paper
Turbulent wind and temperature fluctuations were measured with an ultrasonic anemometer deployed on a buoy near the Meetpost Nordwijk platform during MAPTIP. These measurements were designed to provide MAPTIP investigators with knowledge of over-water turbulence properties and the suitability of existing bulk models for describing them. The friction velocity, u*, and the temperature structure function parameter, C(subscript t)(superscript 2), were determined using both bulk and inertial-dissipation methods. Inertial-dissipation measured C(subscript T)(superscript 2) values agreed well with bulk estimates for values greater than about 0.02. Below this value the inertial-dissipation C(subscript T)(superscript 2) measurements were larger than the bulk estimates, probably due to noise contamination of the weak temperature fluctuation signal in the temperature variance spectrum. Inertial-dissipation u* values were larger than the bulk determinations for higher wind speeds. The bulk formulation used in this study was determined for large fetches with west winds at the MPN location, while only east winds with shorter fetches occurred during MAPTIP. Since fetch limited seas are rougher for a given wind speed, this would cause the inertial- dissipation measured u* values to be higher than the bulk estimates.
Davidson Kenneth L.
Frederickson Paul A.
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