Vertical Cross Sections
In previous chapters the process of frontal intensification by jet crossing was analysed by help of satellite images and numerical parameter fields on certain pressure levels. To gain better insight in the vertical structure of the atmosphere in the region of frontal intensification and the vertical distribution of the relevant parameters, the use of cross sections can be helpful.
Vertical Cross Sections (VCS) trough the front in the region of FI by Jet
In the next chapter several numerical parameters in the vertical cross sections are discussed for the episodes of frontal intensification.
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15 May 2004: 00 UTC |
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15 May 2004: 12 UTC |
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15 May 2004: 18 UTC |
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16 May 2004: 06 UTC |
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16 may 2004: 12 UTC |
Summary of the investigations in this chapter
Use of the vertical cross sections enables the insight into the vertical structure of the atmosphere during the process of front intesification by jet crossing.
The field of isotach show the position of the jet and jet streak during the process.
Change of the vorticity advection was very favourable for upward motion and for the indication of further intensification of the frontal clodiness by jet crossing. Also the two enhanced cloud structures correspond nicely to two PVA maxima.
Potential Vorticity anomaly is well defined 12 hours after the inital stage and shows the intrusion of the cold and dry air even to the 700 hPa level.
Temperature advection distribution is in all stages very typical for the cold front - warm advection within the cloud band and in the upper levels and cold behind.