Abstract
In an effort to describe the basic vertical structure of the nocturnal boundary layer, observations from four experiments are analyzed. During the night, the depth of significant cooling appears to increase with time while the depth of the turbulence and height of the low level wind maximum tend to remain constant or decrease with time. Since the inversion layer extends above the low level wind maximum and shear is small in the region of the low level jet, the Richardson number reaches a maximum at the jet level and then decreases again with height. As a result, turbulence is observed to be a minimum at the height of the low level wind maximum and then increases again above this height.
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André, J. C., De Moor, G., Lacarrere, P., Therry, G., and du Vachat, R.: 1978, ‘Modeling the 24 Hour Evolution of the Mean and Turbulent Structures of the Planetary Boundary Layer’, J. Atmos. Sci. 35, 1861–1883.
Blackadar, A. K.: 1957, ‘Boundary-Layer Wind Maxima and their Significance for the Growth of Nocturnal Inversions’, Bull. Am. Meteorol. Soc. 38, 283–290.
Blackadar, A. K.: 1976, ‘Modeling the Nocturnal Boundary Layer’, Reprints Third Symp. Atmospheric Turbulence, Diffusion and Air Quality, Raleigh, American Meteorological Society, pp. 46–49.
Brost, R. A. and Wyngaard, J. C.: 1978, ‘A Model Study of the Stably Stratified Planetary Boundary Layer’, J. Atmos. Sci. 35, 1427–1440.
Buajitti, K. and Blackadar, A. K.: 1957, ‘Theoretical Studies of Diurnal Wind-Structure Variations in the Planetary Boundary Layer’, Quart. J. Roy. Meteorol. Soc. 83, 486–500.
Businger, J. and Arya, S. P. S.: 1974, ‘Heights of the Mixed Layer in the Stably Stratified Planetary Boundary Layer’, Advan. Geophys. 18A, 73-92. Academic Press.
Clarke, R. H., Dyer, A. J., Brooks, R. R., Reid, D. G., and Troup, A. J.: 1971, ‘The Wangara Experiment: Boundary-Layer Data’, Technical Paper No. 19, Division of Meteorological Physics, CSIRO, Aspendale, Australia, 340 pp.
Clarke, R. H. and Hess, G. D.: 1973, ‘Appropriate Scaling for Velocity and Temperature in the Planetary Boundary Layer’, J. Atmos. Sci. 30, 1346–1353.
Csanady, G. T.: 1972, ‘Geostrophic Drag, Heat and Mass Transfer Coefficients for the Diabatic Ekman Layer’, J. Atmos. Sci. 29, 488–496.
Deardorff, J. W.: 1972, ‘Rate of Growth of the Nocturnal Boundary Layer’, Proc. of the Symposium on Air Pollution, Turbulence and Diffusion, New Mexico, December 1971, pp. 183-190 (H. W. Church and R. E. Luna, editors).
Delage, Y.: 1974, ‘A Numerical Study of the Nocturnal Atmospheric Boundary Layer’, Quart. J. Roy. Meteorol. Soc. 100, 351–364.
Kristensen, L. and Panofsky, H. A.: 1976, ‘Climatology of Wind Direction Fluctuations at Risø’, J. Appl. Meteorol. 15, 1279–1283.
Lanczos, C.: 1956, Applied Analysis, Prentice Hall, Inc., Englewood Cliffs, N.J., 539 pp.
Lenschow, D. H., Stankov, B. B., and Mahrt, L.: 1979}, ‘The Rapid Morning Boundary Layer Transition’, Submitted to J. Atmos. Sci.
Lettau, H.: 1957, ‘Small to Large Scale Features of Boundary Layer Structure over Mountain Slopes’, Proceedings of the Symposium on Mountain Meteorology, 26 June 1957, Fort Collins, Colorado.
Lettau, H. and Davidson, B.: 1957, Exploring the Atmosphere's First Mile, two vols, Pergammon Press, New York and London.
Mahrt, L. and Heald, R.: 1979, ‘Comment on Determining height of the nocturnal Boundary layer’, J. Appl. Meteor. 18, 383.
Mahrt, L. and Schwerdtfeger, W.: 1970, ‘Ekman Spirals for Exponential Thermal Wind’, Boundary-Layer Meteorol. 1, 137–145.
Melgarejo, J. W. and Deardorff, J. W.: 1974, ‘Stability Functions for the Boundary Layer Resistance Laws Based on Observed Boundary-Layer Heights’, J. Atmos. Sci. 31, 1324–1333.
Merrill, John T.: 1977, ‘Observational and Theoretical Study of Shear Instability in the Air Flow Near the Ground’, J. Atmos. Sci. 34, 911–921.
Wippermann, F.: 1973, ‘Numerical Study on the Effects Controlling the Low-level Jet’, Beit. Phys. Atmos. 46, 137–154.
Wyngaard, J. C.: 1975, ‘Modeling the Planetary Boundary Layer-Extension to the Stable Case’, Boundary Layer Meteorol. 9, 441–460.
Yamada, T.: 1978, ‘Prediction of the Nocturnal Surface Inversion Height’, J. Appl. Meteorol. 18, 526–531.
Yamada, T. and Mellor, G.: 1975, ‘A Simulation of the Wangara Atmospheric Boundary Layer Data’, J. Atmos. Sci. 32, 2309–2329.
Yu, T. W.: 1978, ‘Determining Height of the Nocturnal Boundary Layer’, J. Appl. Meteorol. 17, 28–33.
Zeman, Otto: 1979, ‘Parameterization of the Dynamics of Stable Boundary Layers and Nocturnal Jets’, J. Atmos. Sci. 36, 792–804.
Zilitinkevich, S. S.: 1972, ‘On the Determination of the Height of the Ekman boundary Layer’, Boundary Layer Meteorol. 3, 141–145.
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The National Center for Atmospheric Research is sponsored by the National Science Foundation.
Part of this work was performed while a visiting scientist at Oregon State University.
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Mahrt, L., Heald, R.C., Lenschow, D.H. et al. An observational study of the structure of the nocturnal boundary layer. Boundary-Layer Meteorol 17, 247–264 (1979). https://doi.org/10.1007/BF00117983
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DOI: https://doi.org/10.1007/BF00117983