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Evaluation of Boundary Layer Similarity Theory for Stable Conditions in CASES-99

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  • 1 Division of Earth Environmental System, Pusan National University, Busan, South Korea
  • | 2 Policy Research Laboratory, National Institute of Meteorological Research, Korea Meteorological Administration, Seoul, South Korea
  • | 3 Division of Earth Environmental System, Pusan National University, Busan, South Korea
  • | 4 Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu, South Korea
  • | 5 COAS, Oregon State University, Corvallis, Oregon
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Abstract

The Monin–Obukhov similarity theory and a generalized formulation of the mixing length for the stable boundary layer are evaluated using the Cooperative Atmosphere–Surface Exchange Study-1999 (CASES-99) data. The large-scale wind forcing is classified into weak, intermediate, and strong winds. Although the stability parameter, z/L, is inversely dependent on the mean wind speed, the speed of the large-scale flow includes independent influences on the flux–gradient relationship. The dimensionless mean wind shear is found to obey existing stability functions when z/L is less than unity, particularly for the strong and intermediate wind classes. For weak mean winds and/or strong stability (z/L > 1), this similarity theory breaks down. Deviations from similarity theory are examined in terms of intermittency. A case study of a weak-wind night indicates important modulation of the turbulence flux by mesoscale motions of unknown origin.

Corresponding author address: Kyung-Ja Ha, Division of Earth Environmental System, Pusan National University, Busan, 609-735, South Korea. Email: kjha@pusan.ac.kr

Abstract

The Monin–Obukhov similarity theory and a generalized formulation of the mixing length for the stable boundary layer are evaluated using the Cooperative Atmosphere–Surface Exchange Study-1999 (CASES-99) data. The large-scale wind forcing is classified into weak, intermediate, and strong winds. Although the stability parameter, z/L, is inversely dependent on the mean wind speed, the speed of the large-scale flow includes independent influences on the flux–gradient relationship. The dimensionless mean wind shear is found to obey existing stability functions when z/L is less than unity, particularly for the strong and intermediate wind classes. For weak mean winds and/or strong stability (z/L > 1), this similarity theory breaks down. Deviations from similarity theory are examined in terms of intermittency. A case study of a weak-wind night indicates important modulation of the turbulence flux by mesoscale motions of unknown origin.

Corresponding author address: Kyung-Ja Ha, Division of Earth Environmental System, Pusan National University, Busan, 609-735, South Korea. Email: kjha@pusan.ac.kr

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