Abstract
Atmospheric turbulence measurements, including temperature and humidity fluctuations, were made from the R/V Acania off the coast of California in June, 1979. The purpose of the experiment was to investigate the scaling properties of the humidity structure function parameter (C q 2) and temperaturehumidity cospectrum structure parameter (C Tq) in the marine surface layer. The bulk parameterization method was used to obtain Monin-Obukhov Similarity (MOS) scaling parameters u *, T *, q *and L. Assuming a neutral stability humidity drag coefficient c qn = 1.3 × 10-3the dimensionless humidity structure function parameter C q 2Z2/3/q* 2was found to be 18% lower than the corresponding temperature function obtained by Wyngaard et al. (1971). Furthermore, the measurements indicate that the temperature-humidity fluctuations are highly coherent well into the inertial subrange. The results have direct application to turbulent scattering of waves propagating in the atmosphere (particularly microwaves) and methods of estimating air-sea surface fluxes.
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References
Buck, Arden: 1979, ‘RSF/RAF Lyman-alpha Hydrometer Model LA-3’, Operating and Maintenance Manual 083–032–007, NCAR, Boulder, Co.
Businger, J. A.: 1973, ‘Turbulent Transfer in the Atmospheric Surface Layer’, Workshop on Micrometeorology, D. Haugen, Editor, American Meteorological Society, 67–98.
Davidson, K. L., Houlihan, T. M., Fairall, C. W., and Schacher, G. E.: 1978, ‘Observation of the Temperature Structure Function Parameter, C T 2, Over the Ocean’, Boundary-Layer Meteorol., 15, 507–523.
Fairall, C. W., Davidson, K. L., and Schacher, G. E.: 1979, ‘Humidity Effects and Sea-Salt Contamination of Atmospheric Temperature Sensors’, J. Appl. Meteorol. to be published.
Friehe, C. A., La Rue, J. C., Champagne, F. H., Gibson, C. H., and Dreyer, G. F.: 1975, ‘Effects of Temperature and Humidity Fluctuations on the Optical Refractive Index in the Marine Boundary Layer’, J. Opt. Soc. Amer., 65, 1502–1511.
Friehe, C. A.: 1977, ‘Estimation of the Refractive-Index Temperature Structure Parameter in the Atmosphere Boundary Layer Over the Ocean’, Appl. Optics, 16, 334–340.
Friehe, C. A. and Schmitt, K. F.: 1976, ‘Parameterization of Air-Sea Interface Fluxes of Sensible Heat and Moisture by the Bulk Aerodynamic Formulas’, J. Phys. Oceanogr., 6, 801–809.
Haugen, D.: 1973, Workshop on Micrometeorology, American Meteorological Society [Science Press] 392 pp.
Kondo, J.: 1975, ‘Air-Sea Bulk Transfer Coefficients in Diabatic Conditions’, Boundary-Layer Meteorol., 6, 47–52.
Liu, W. T.: 1978, ‘The Molecular Effects on Air-Sea Exchanges’, Ph. D. Dissertation, University of Washington, Seattle, Wa, 170 pp.
McBean, G. A. and Miyake, M.: 1972, ‘Turbulent Transfer Mechanisms in the Atmospheric Surface Layer’, Quart. J. Roy., Meteorol Soc., 98, 383–398.
Shutt, W. L.: 1976, ‘An Investigation of Small Scale Humidity Fluctuations in the Marine Boundary Layer’, M.S. Thesis, Naval Postgraduate School, Monterey, CA, 63 pp.
Schmitt, K. F., Friehe, C. A., and Gibson, C. H.: 1978, ‘Humidity Sensitivity of Atmospheric Temperature Sensors by Salt Contamination’, J. Phys. Oceanogr., 8, 151–161.
Tatarskii, V. I.: 1971, ‘The Effects of The Turbulent Atmosphere on Wave Propagation’ [NTIS TT 68-50464].
Wesely, M. L.: 1976a, ‘The Combined Effects of Temperature and Humidity Fluctuations on Refractive Index’, J. Appl. Meteorol., 15, 43–49.
Wesely, M. L.: 1976b, ‘A Comparison of Two Optical Methods for Measuring Line Averages of Thermal Exchanges Above Warm Water Surfaces’, J. Appl. Meteorol., 15, 1177–1188.
Wesely, M. L. and Hicks, B. B.: 1978, ‘High Frequency Temperature and Humidity Correlation Above a Warm Wet Surface’, J. Appl. Meteorol., 17, 123–128.
Wyngaard, J. C., Izumi, Y., and Collins, S. A.: 1971, ‘Behavior of the Refractive Index Structure Parameter near the Ground’, J. Opt. Soc. Am., 61, 1646–1650.
Wyngaard, J. C., Pennell, W. T., Lenschow, D. H., and LeMone, M. S.: 1978, ‘The Temperature-Humidity Covariance Budget in the Convective Boundary Layer’, J. Atmos. Sci., 35, 47–58.
Wyngaard, J. C. and Clifford, S. F.: 1978, ‘Estimating Momentum, Heat and Moisture Fluxes From Structure Parameters’, J. Atmos. Sci., 35, 1204–1211.
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Fairall, C.W., Schacher, G.E. & Davidson, K.L. Measurements of the humidity structure function parameters, C q 2and C Tq , over the ocean. Boundary-Layer Meteorol 19, 81–92 (1980). https://doi.org/10.1007/BF00120312
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DOI: https://doi.org/10.1007/BF00120312