Abstract
Ensemble averages of temperature before and after step-like temperature fluctuations reveal the presence of inverted ramps in a stable surface layer. Normalized frequency of upward steps increases with increasing stability, whereas normalized magnitude of the temperature step decreases with stability and becomes constant at about R i = 1. These results suggest that the significance of temperature steps increases as stability increases. In moderate stability, the temperature pattern shows a gradual decrease after an upward step, which can be called a time-inverted ramp. Descending air and large downward heat flux are observed in a time-inverted ramp, suggesting a contribution from an ordered motion in wind. On the other hand, the temperature steps are related to gravity waves in strong stability.
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References
Antonia, R. A., Chambers, A. J., Friehe, C. A., and Van Atta, C. W.: 1977, ‘Temperature Ramps in the Atmospheric Surface Layer’, J. Atmos. Sci. 36, 99–108.
Antonia, R. A., Rajagopalan, S., and Chambers, A. J.: 1983, ‘Conditional Sampling of Turbulence in the Atmospheric Surface Layer’, J. Climate and Appl. Meteorol. 22, 69–78.
Chiba, O.: 1984, ‘Height Dependence of the Scale of Turbulence and Higher-Order Moments of the Vertical Wind Velocity in the Neutral Atmospheric Surface Layer’, J. Met. Soc. Japan 62, 312–322.
Chiba, O. and Kikuchi, T.: 1982, ‘A Semiempirical Formula for the Vertical Wind Velocity Skewness in the Unstable Atmospheric Surface Layer’, Tenki 29, 1213–1220 (in Japanese).
Kaimal, J. C. and Businger, J. A.: 1970, ‘Case Studies of a Convective Plume and Dust Devil’, J. Appl. Meteorol. 9, 612–620.
Kaimal, J. C., Wyngaard, J. C., Izumi, Y., and Coté, O. R.: 1972, ‘Spectral Characteristics of Surface-Layer Turbulence’, Quart. J. R. Meteorol. Soc. 98, 563–589.
Kline, S. J., Reynolds, W. C., Schraub, F. A., and Runstadler, P. W.: 1967, ‘The Structure of Turbulent Boundary Layers’, J. Fluid Mech. 30, 741–773.
Kondo, J., Kanechika, O., and Yasuda, N.: 1978, ‘Heat and Momentum Transfer under Strong Stability in the Atmospheric Surface Layer’, J. Atmos. Sci. 35, 1012–1021.
Kovasznay, L. S. G., Kibens, V., and Blackwelder, R. F.: 1970, ‘Large-scale Motion in the Intermittent Region of a Turbulent Boundary Layer’, J. Fluid Mech. 41, (2) 283–325.
Phong-anant, D., Antonia, R. A., Chambers, A. J., and Rajagopalan, S.: 1980, ‘Features of the Organized Motion in the Atmospheric Surface Layer’, J. Geophys. Res. 85, 424–432.
Saito, M. and Ishii, Y.: 1969, ‘Simple Recursive Filter’, Butsuri-tanko (Geophysical Exploration) 22, 527–532 (in Japanese).
Wallace, J. M., Eckelmann, H., and Brodkey, R. S.: 1972, ‘The Wall Region in Turbulent Shear Flow’, J. Fluid Mech. 60, 39–48.
Wallace, J. M., Brodkey, R. S., and Eckelmann, H.: 1977, ‘Pattern-Recognized Structures in Bounded Turbulent Shear Flows’, J. Fluid Mech. 83, (4) 673–639.
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Kikuchi, T., Chiba, O. Step-like temperature fluctuations associated with inverted ramps in a stable surface layer. Boundary-Layer Meteorol 31, 51–63 (1985). https://doi.org/10.1007/BF00120034
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DOI: https://doi.org/10.1007/BF00120034