Small-scale turbulence measurements from a buoy during MAPTIP

Kenneth L. Davidson; Paul A. Frederickson

doi:10.1117/12.254209

14 October 1996 Small-scale turbulence measurements from a buoy during MAPTIP

Kenneth L. Davidson, Paul A. Frederickson

Proceedings Volume 2828, Image Propagation through the Atmosphere; (1996) https://doi.org/10.1117/12.254209
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

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_t², were determined using both bulk and inertial-dissipation methods. Inertial-dissipation measured C_T² values agreed well with bulk estimates for values greater than about 0.02. Below this value the inertial-dissipation C_T² 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.

Citation Download Citation

Kenneth L. Davidson and Paul A. Frederickson "Small-scale turbulence measurements from a buoy during MAPTIP", Proc. SPIE 2828, Image Propagation through the Atmosphere, (14 October 1996); https://doi.org/10.1117/12.254209

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