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Boundary-Layer Meteorology

, Volume 129, Issue 2, pp 191–210 | Cite as

Microstructure of Turbulence in the Stably Stratified Boundary Layer

  • Zbigniew Sorbjan
  • Ben B. Balsley
Open Access
Original Paper

Abstract

The microstructure of a stably stratified boundary layer, with a significant low-level nocturnal jet, is investigated based on observations from the CASES-99 campaign in Kansas, U.S.A. The reported, high-resolution vertical profiles of the temperature, wind speed, wind direction, pressure, and the turbulent dissipation rate, were collected under nocturnal conditions on October 14, 1999, using the CIRES Tethered Lifting System. Two methods for evaluating instantaneous (1-sec) background profiles are applied to the raw data. The background potential temperature is calculated using the “bubble sort” algorithm to produce a monotonically increasing potential temperature with increasing height. Other scalar quantities are smoothed using a running vertical average. The behaviour of background flow, buoyant overturns, turbulent fluctuations, and their respective histograms are presented. Ratios of the considered length scales and the Ozmidov scale are nearly constant with height, a fact that can be applied in practice for estimating instantaneous profiles of the dissipation rate.

Keywords

Boundary-layer measurements Boundary-layer turbulence Ozmidov scale Stable boundary layer Tethered lifting system Thorpe scale 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2008

Authors and Affiliations

  1. 1.Department of PhysicsMarquette UniversityMilwaukeeUSA
  2. 2.Cooperative Institute for Research in Environmental Sciences, University of ColoradoBoulderUSA

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