Details
| Original language | English |
|---|---|
| Pages (from-to) | 225-246 |
| Number of pages | 22 |
| Journal | Boundary-Layer Meteorology |
| Volume | 111 |
| Issue number | 2 |
| Publication status | Published - May 2004 |
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.
Keywords
- Convection, Entrainment, Heterogeneous surface heat flux, Large-eddy simulation, Numerical modelling
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Atmospheric Science
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In: Boundary-Layer Meteorology, Vol. 111, No. 2, 05.2004, p. 225-246.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Interaction between wind and temperature fields in the planetary boundary layer for a spatially heterogeneous surface heat flux
AU - Kim, Hyoung Jin
AU - Noh, Yign
AU - Raasch, Siegfried
N1 - Funding Information: This study has been supported by the Ministry of Science and Technology through National Research Laboratory Program, Cooperative Research under the Korean-German Science Program, and the Climate Environment System Research Center sponsored by the SRC program of KOSEF. We would especially like to thank Marcus Oliver Letzel from IMUK for his kind and critical comments.
PY - 2004/5
Y1 - 2004/5
N2 - 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.
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.
KW - Convection
KW - Entrainment
KW - Heterogeneous surface heat flux
KW - Large-eddy simulation
KW - Numerical modelling
UR - http://www.scopus.com/inward/record.url?scp=1842483251&partnerID=8YFLogxK
U2 - 10.1023/B:BOUN.0000016471.75325.75
DO - 10.1023/B:BOUN.0000016471.75325.75
M3 - Article
AN - SCOPUS:1842483251
VL - 111
SP - 225
EP - 246
JO - Boundary-Layer Meteorology
JF - Boundary-Layer Meteorology
SN - 0006-8314
IS - 2
ER -