Turbulence and low-level jets in the stable boundary layer

P. Baas

Research output: Thesisinternal PhD, WU

Abstract

It is common knowledge that in the evening the wind close to the ground drops. However, it is less well known that at the same time the wind at a few hundreds of meters height can strongly accelerate. In this case, the vertical wind-profile shows a distinct maximum. This phenomenon is called nocturnal low-level jet (LLJ). Knowledge of the LLJ is relevant for aviation, the generation of wind energy and the distribution of pollutants. This thesis presents a climatology of LLJ characteristics (like the frequency of occurrence and the typical height at which the phenomenon occurs) for observations from the KNMI measurement site at Cabauw. The development of nocturnal LLJs is very sensitive to the amount of turbulent mixing. In this thesis different ways on which turbulence is represented in atmospheric models are tested. Various strategies for model evaluation are discussed. This thesis aims to contribute to the understanding of physical processes and their representation in weather and climate models.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • Holtslag, Bert, Promotor
  • Bosveld, F.C., Co-promotor, External person
Award date14 Oct 2009
Place of Publication[S.l.
Publisher
Print ISBNs9789085854463
Publication statusPublished - 2009

Fingerprint

boundary layer
turbulence
wind profile
turbulent mixing
climatology
climate modeling
weather
pollutant
energy
thesis
atmospheric model
physical process
evaluation
distribution

Keywords

  • meteorology
  • atmosphere
  • turbulence
  • terrestrial radiation
  • insolation
  • turbulent flow
  • climatic factors
  • boundary-layer meteorology
  • atmospheric gravity waves
  • atmospheric boundary-layer

Cite this

Baas, P.. / Turbulence and low-level jets in the stable boundary layer. [S.l. : S.n., 2009. 151 p.
@phdthesis{7b78ba5e92944faab60ce8497b406749,
title = "Turbulence and low-level jets in the stable boundary layer",
abstract = "It is common knowledge that in the evening the wind close to the ground drops. However, it is less well known that at the same time the wind at a few hundreds of meters height can strongly accelerate. In this case, the vertical wind-profile shows a distinct maximum. This phenomenon is called nocturnal low-level jet (LLJ). Knowledge of the LLJ is relevant for aviation, the generation of wind energy and the distribution of pollutants. This thesis presents a climatology of LLJ characteristics (like the frequency of occurrence and the typical height at which the phenomenon occurs) for observations from the KNMI measurement site at Cabauw. The development of nocturnal LLJs is very sensitive to the amount of turbulent mixing. In this thesis different ways on which turbulence is represented in atmospheric models are tested. Various strategies for model evaluation are discussed. This thesis aims to contribute to the understanding of physical processes and their representation in weather and climate models.",
keywords = "meteorologie, atmosfeer, turbulentie, terrestrische straling, zonne-instraling, turbulente stroming, klimaatfactoren, grenslaagmeteorologie, zwaartekrachtgolven, atmosferische grenslaag, meteorology, atmosphere, turbulence, terrestrial radiation, insolation, turbulent flow, climatic factors, boundary-layer meteorology, atmospheric gravity waves, atmospheric boundary-layer",
author = "P. Baas",
note = "WU thesis 4694",
year = "2009",
language = "English",
isbn = "9789085854463",
publisher = "S.n.",
school = "Wageningen University",

}

Baas, P 2009, 'Turbulence and low-level jets in the stable boundary layer', Doctor of Philosophy, Wageningen University, [S.l..

Turbulence and low-level jets in the stable boundary layer. / Baas, P.

[S.l. : S.n., 2009. 151 p.

Research output: Thesisinternal PhD, WU

TY - THES

T1 - Turbulence and low-level jets in the stable boundary layer

AU - Baas, P.

N1 - WU thesis 4694

PY - 2009

Y1 - 2009

N2 - It is common knowledge that in the evening the wind close to the ground drops. However, it is less well known that at the same time the wind at a few hundreds of meters height can strongly accelerate. In this case, the vertical wind-profile shows a distinct maximum. This phenomenon is called nocturnal low-level jet (LLJ). Knowledge of the LLJ is relevant for aviation, the generation of wind energy and the distribution of pollutants. This thesis presents a climatology of LLJ characteristics (like the frequency of occurrence and the typical height at which the phenomenon occurs) for observations from the KNMI measurement site at Cabauw. The development of nocturnal LLJs is very sensitive to the amount of turbulent mixing. In this thesis different ways on which turbulence is represented in atmospheric models are tested. Various strategies for model evaluation are discussed. This thesis aims to contribute to the understanding of physical processes and their representation in weather and climate models.

AB - It is common knowledge that in the evening the wind close to the ground drops. However, it is less well known that at the same time the wind at a few hundreds of meters height can strongly accelerate. In this case, the vertical wind-profile shows a distinct maximum. This phenomenon is called nocturnal low-level jet (LLJ). Knowledge of the LLJ is relevant for aviation, the generation of wind energy and the distribution of pollutants. This thesis presents a climatology of LLJ characteristics (like the frequency of occurrence and the typical height at which the phenomenon occurs) for observations from the KNMI measurement site at Cabauw. The development of nocturnal LLJs is very sensitive to the amount of turbulent mixing. In this thesis different ways on which turbulence is represented in atmospheric models are tested. Various strategies for model evaluation are discussed. This thesis aims to contribute to the understanding of physical processes and their representation in weather and climate models.

KW - meteorologie

KW - atmosfeer

KW - turbulentie

KW - terrestrische straling

KW - zonne-instraling

KW - turbulente stroming

KW - klimaatfactoren

KW - grenslaagmeteorologie

KW - zwaartekrachtgolven

KW - atmosferische grenslaag

KW - meteorology

KW - atmosphere

KW - turbulence

KW - terrestrial radiation

KW - insolation

KW - turbulent flow

KW - climatic factors

KW - boundary-layer meteorology

KW - atmospheric gravity waves

KW - atmospheric boundary-layer

M3 - internal PhD, WU

SN - 9789085854463

PB - S.n.

CY - [S.l.

ER -