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A new approach to the height determination of the mixing layerстатья
- Автор: Lokoshchenko M.A.
- Сборник: Proceedings of the 11th International Symposium on Acoustic Remote Sensing (ISARS) and Associated Techniques of the Atmosphere and Oceans
- Год издания: 2002
- Место издания: ISAC/CNR Rome, Italy
- Первая страница: 235
- Последняя страница: 238
- Аннотация: The method of determination of the mixing layer height (MLH) suggested by Holzworth is widely adopted in the whole world. However, its accuracy is low when a profile and a dry-adiabatic line are close to each other. Besides, an inertial lifting of overheated air bubbles can probably take place above the first intersection of these curves, leading to some underestimation of a real MLH. A new suggestion, use of the instability energy E as an integral parameter, is given. A simple model has been created for the MLH calculation, based on the parcel method using values of E. The most possible inertial range was found out to be in average two thirds the traditional MLH. However, the parcel method overestimates real MLH values. This model has been developed for more exact MLH calculations. A real vertical wind speed by the sodar data has been accounted by a special co-efficient of the symbolic ‘aerodynamic’ force. A calculation by means of the corrected model demonstrates that an inertial lifting is extremely small on a real atmosphere for one hour averaging, but seems to be more for individual upward flows.
- Добавил в систему: Локощенко Михаил Александрович