Interaction between wind and temperature fields in the planetary boundary layer for a spatially heterogeneous surface heat flux

Hyoung Jin Kim, Yign Noh, Siegfried Raasch

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Interaction between wind and temperature fields in the planetary boundary layer for a spatially heterogeneous surface heat flux has been investigated using large-eddy simulation. It is shown that a substantial difference exists in the wind and temperature fields, depending on whether the directions of the background wind and the surface heat flux variation are parallel or perpendicular. When they are parallel to each other, two-dimensional plumes induced by the heterogeneous surface heat flux are easily destroyed by the background wind, and the velocity field is strongly modified by convective eddies compared to the case when they are perpendicular to to each other. This leads to a substantial difference in the profiles of turbulent kinetic energy and its flux. It also results in a difference between the two cases in the bulk properties of the planetary boundary layer, such as the entrainment at the top of the planetary boundary layer and the drag at the bottom, which have important implications for boundary-layer modelling. The difference between the two cases exists even when the background wind speed is as large as 15.0 m s-1. Meanwhile, the contrast between two cases is weakened by the Coriolis force.

Original languageEnglish
Pages (from-to)225-246
Number of pages22
JournalBoundary-Layer Meteorology
Volume111
Issue number2
DOIs
Publication statusPublished - 2004 May 1

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heat flux
boundary layer
temperature
Coriolis force
large eddy simulation
entrainment
kinetic energy
drag
eddy
plume
wind velocity
modeling

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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abstract = "Interaction between wind and temperature fields in the planetary boundary layer for a spatially heterogeneous surface heat flux has been investigated using large-eddy simulation. It is shown that a substantial difference exists in the wind and temperature fields, depending on whether the directions of the background wind and the surface heat flux variation are parallel or perpendicular. When they are parallel to each other, two-dimensional plumes induced by the heterogeneous surface heat flux are easily destroyed by the background wind, and the velocity field is strongly modified by convective eddies compared to the case when they are perpendicular to to each other. This leads to a substantial difference in the profiles of turbulent kinetic energy and its flux. It also results in a difference between the two cases in the bulk properties of the planetary boundary layer, such as the entrainment at the top of the planetary boundary layer and the drag at the bottom, which have important implications for boundary-layer modelling. The difference between the two cases exists even when the background wind speed is as large as 15.0 m s-1. Meanwhile, the contrast between two cases is weakened by the Coriolis force.",
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Interaction between wind and temperature fields in the planetary boundary layer for a spatially heterogeneous surface heat flux. / Kim, Hyoung Jin; Noh, Yign; Raasch, Siegfried.

In: Boundary-Layer Meteorology, Vol. 111, No. 2, 01.05.2004, p. 225-246.

Research output: Contribution to journalArticle

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AU - Noh, Yign

AU - Raasch, Siegfried

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AB - Interaction between wind and temperature fields in the planetary boundary layer for a spatially heterogeneous surface heat flux has been investigated using large-eddy simulation. It is shown that a substantial difference exists in the wind and temperature fields, depending on whether the directions of the background wind and the surface heat flux variation are parallel or perpendicular. When they are parallel to each other, two-dimensional plumes induced by the heterogeneous surface heat flux are easily destroyed by the background wind, and the velocity field is strongly modified by convective eddies compared to the case when they are perpendicular to to each other. This leads to a substantial difference in the profiles of turbulent kinetic energy and its flux. It also results in a difference between the two cases in the bulk properties of the planetary boundary layer, such as the entrainment at the top of the planetary boundary layer and the drag at the bottom, which have important implications for boundary-layer modelling. The difference between the two cases exists even when the background wind speed is as large as 15.0 m s-1. Meanwhile, the contrast between two cases is weakened by the Coriolis force.

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