Boundary-Layer Meteorology

, Volume 147, Issue 2, pp 179–199 | Cite as

Non-stationary Generation of Weak Turbulence for Very Stable and Weak-Wind Conditions

  • Larry Mahrt
  • Christoph Thomas
  • Scott Richardson
  • Nelson Seaman
  • David Stauffer
  • Matthias Zeeman
Open Access
Article

Abstract

Turbulence measurements for very stable conditions near the surface are contrasted among three sites: a high altitude basin during winter with grass or snow-covered grass, a broad valley with complex agricultural land use, and a more narrow valley that is influenced by a valley cold pool and cold air drainage. In contrast to previous studies, this investigation emphasizes the very weak turbulence with large bulk Richardson number occurring during extensive periods between brief mixing events. The relationship of the turbulence to the non-stationary wind and stratification is examined along with the impact of short-term flow accelerations, directional shear and downward diffusion of turbulence from higher levels. The failure of the turbulence for strong stratification to decrease with further increase of stratification is explored. Additional analyses are applied to weak-wind cases for the entire range of stratification, including weak stratification associated with cloudy conditions.

Keywords

Intermittent turbulence Nocturnal boundary layer Stable boundary layer Submeso Weak winds 

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Copyright information

© The Author(s) 2012

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

Authors and Affiliations

  • Larry Mahrt
    • 1
  • Christoph Thomas
    • 1
  • Scott Richardson
    • 2
  • Nelson Seaman
    • 2
  • David Stauffer
    • 2
  • Matthias Zeeman
    • 3
  1. 1.CEOASOregon State UniversityCorvallisUSA
  2. 2.Department of MeteorologyPennsylvania State UniversityUniversity ParkUSA
  3. 3.Institute of Meteorology and Climate Research (IMK-IFU)Karlsruhe Institute of Technology (KIT)GarmischGermany

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