Details
| Original language | English |
|---|---|
| Pages (from-to) | 349-375 |
| Number of pages | 27 |
| Journal | Boundary-Layer Meteorology |
| Volume | 52 |
| Issue number | 4 |
| Publication status | Published - Sept 1990 |
Abstract
During cold air outbreaks, cold and stably stratified air masses are advected from land or ice surfaces over a warmer sea surface. Due to the heating from below, a convective boundary layer develops. For small fetches, convection is organized in the form of horizontal roll vortices, which at greater distances join in a zone with open or closed cells. The formation of the convective boundary layer, and the associated roll vortices, is simulated with a numerical model and results are compared with observations obtained during the MASEX experiment off the east coast of the United States. To validate the model, a comparison with a one-dimensional mixed-layer model is also made, with special attention given to the exact representation of the observed initial and boundary conditions. Comparisons between model results and observations show good qualitative and quantitative correspondence in mean temperature and heat flux profiles respectively at different distances from the coast. Maximum values of vertical velocity are well reproduced. Turbulent kinetic energy is found to be concentrated in the small updraft regions of the rolls, which is in accordance with observations from the MASEX-experiment.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Atmospheric Science
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In: Boundary-Layer Meteorology, Vol. 52, No. 4, 09.1990, p. 349-375.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Numerical simulation of the development of the convective boundary layer during a cold air outbreak
AU - Raasch, S.
N1 - Funding Information: Thanks are due to Mrs. Rosemarie Lorenz for typing the manuscript and drafting the figures. The model runs were performed on the CYBER 180-995 of the Regionales Rechenzentrum fiir Niedersachsen in Hannover and on a CRAY-XMP of the Konrad-Zuse-Zentrum fiir Informationstechnik Berlin.
PY - 1990/9
Y1 - 1990/9
N2 - During cold air outbreaks, cold and stably stratified air masses are advected from land or ice surfaces over a warmer sea surface. Due to the heating from below, a convective boundary layer develops. For small fetches, convection is organized in the form of horizontal roll vortices, which at greater distances join in a zone with open or closed cells. The formation of the convective boundary layer, and the associated roll vortices, is simulated with a numerical model and results are compared with observations obtained during the MASEX experiment off the east coast of the United States. To validate the model, a comparison with a one-dimensional mixed-layer model is also made, with special attention given to the exact representation of the observed initial and boundary conditions. Comparisons between model results and observations show good qualitative and quantitative correspondence in mean temperature and heat flux profiles respectively at different distances from the coast. Maximum values of vertical velocity are well reproduced. Turbulent kinetic energy is found to be concentrated in the small updraft regions of the rolls, which is in accordance with observations from the MASEX-experiment.
AB - During cold air outbreaks, cold and stably stratified air masses are advected from land or ice surfaces over a warmer sea surface. Due to the heating from below, a convective boundary layer develops. For small fetches, convection is organized in the form of horizontal roll vortices, which at greater distances join in a zone with open or closed cells. The formation of the convective boundary layer, and the associated roll vortices, is simulated with a numerical model and results are compared with observations obtained during the MASEX experiment off the east coast of the United States. To validate the model, a comparison with a one-dimensional mixed-layer model is also made, with special attention given to the exact representation of the observed initial and boundary conditions. Comparisons between model results and observations show good qualitative and quantitative correspondence in mean temperature and heat flux profiles respectively at different distances from the coast. Maximum values of vertical velocity are well reproduced. Turbulent kinetic energy is found to be concentrated in the small updraft regions of the rolls, which is in accordance with observations from the MASEX-experiment.
UR - http://www.scopus.com/inward/record.url?scp=0025014090&partnerID=8YFLogxK
U2 - 10.1007/BF00119429
DO - 10.1007/BF00119429
M3 - Article
AN - SCOPUS:0025014090
VL - 52
SP - 349
EP - 375
JO - Boundary-Layer Meteorology
JF - Boundary-Layer Meteorology
SN - 0006-8314
IS - 4
ER -