| Turbulent Dissipation in Frontal Zones from Hot-Wire Measurements in theMICROFRONTS Experiment |
SEP 1999 |
8 pages |
| Authors:
William Blumen; COLORADO UNIV AT BOULDER
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 | Measurements of turbulent dissipation of kinetic energy have been taken of synoptic and small scale density frontal passages during the MICROFRONTS (MARCH 1999, Kansas) field program. It is revealed that there is a significant increase of turbulent kinetic energy during each-passage of the frontal transition zone. Data analyses suggest a linear relationship between the frontal width and the enhanced kinetic energy dissipation rate. A theoretical ... |
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| Front - Boundary Layer Processes |
FEB 1998 |
20 pages |
| Authors:
William Blumen; COLORADO UNIV AT BOULDER
|
| Analysis and modeling of boundary layer influences on atmospheric cold fronts are carried out with data sets obtained from two field programs. These programs are the STorm scale Operational and Research Meteorology Fronts Experiment Systems Test (STORM-FEST), February-March 1992, and the MICROFRONTS experiment, March 1995. Particular emphasis is placed on the analysis of data to explore the role of the boundary layer on frontogenesis and on ... |
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| Front-Boundary Layer Models from STORM-FEST Observations |
16 OCT 95 |
14 pages |
| Authors:
William Blumen; COLORADO UNIV AT BOULDER
|
| The cold frontal event of 20-21 February 1992 that occurred in a densely instrumented observational domain during the Storm scale Operational and Research Meteorology Fronts Experiment Systems Test (STORM-FEST) was examined. Data were analyzed and the observed event was compared to a theoretical model that contains the basic physical mechanisms of dry and inviscid frontogenesis. The actual frontal evolution above the boundary layer (400-500m) compared well with the model predictions, ... |
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| Front-Boundary Layer Models from STORM-FEST Observations |
02 MAY 94 |
8 pages |
| Authors:
William Blumen; COLORADO UNIV AT BOULDER DEPT OF ASTROPHYSICAL PLANETARY AND ATMOSPHERIC SCIEN CES
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| The STORM-FEST field campaign to investigate atmospheric frontal structure and evolution provided data on deformation frontogenesis observed 20- 21 February 1992. These data have been analyzed, and the principal features compared with the theoretical predictions of a semi-geostrophic inviscid, adiabatic model. The overall agreement is good, although viscous and thermal diffusion in the planetary boundary layer is omitted from the theoretical model. The relative importance of terms neglected in the ... |
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| U.S. National Weather Experiment STORM-FEST: Waves and Turbulence in Frontal Zones |
23 DEC 93 |
5 pages |
| Authors:
William Blumen; COLORADO UNIV AT BOULDER DEPT OF ASTROPHYSICAL PLANETARY AND ATMOSPHERIC SCIEN CES
|
| A high density of surface and upper air observations, including aircraft observations, were accumulated during the STORM-FEST field campaign in the central United States (1 February-13 March 1992). These data were analyzed to identify significant internal gravity wave and turbulent activity that occurred in association with low-level frontal passages through the boundary layer. The principal analysis method was local decomposition using wavelets as basis functions. These functions provided information on ... |
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| U.S. National Weather Experiment STORM-FEST 1992: Wave and Turbulence in Frontal Zones |
01 DEC 92 |
3 pages |
| Authors:
William Blumen; COLORADO UNIV AT BOULDER DEPT OF ASTROPHYSICAL PLANETARY AND ATMOSPHERIC SCIEN CES
|
| A high density of surface and upper air observations, including aircraft observations, were accumulated during the STORM-FEST Experiment in the central United States (1 February-13 March 1992). These data are being analyzed to identify significant internal gravity wave and turbulent activity that occur in association with low-level frontal passages. The principal analysis method is local decomposition using wavelets as basis functions. These functions provide information on both scale and translation ... |
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| SOME STABILITY PROPERTIES OF A MATERIAL LAYER MODEL OF THE ATMOSPHERE. |
01 FEB 1964 |
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| Authors:
William Blumen; OSLO UNIV (NORWAY)
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 | Some baroclinic stability properties of an atmospheric two-layer model, in which the bottom layer is bounded by two constant potential temperature surfaces, are investigated. The perturbation method is employed and the motion takes place on the beta-plane. Curves of neutral stability are constructed for three different cases and the results discussed. (Author) |
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