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您的检索式：作者名="Y.L.McHall"
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| 1 | ZONAL MEAN STRUCTURES OF THE EXTRATROPICAL TROPOSPHERE显示文摘The study of mean circulation fields requires evaluation of eddy foreings in the atmosphere.Due to the difficulty incalculating the eddy forcings on theory,the mean state equations including the eddy forcings were used mostly fordiagnostic studies only.Using the geostrophic perturbation solutions obtained by McHall (1991a),we may deal withtheoretically the eddy fluxes and their convergence.This allows us to employ the mean state equations for the study ofmean circulation fields.It will be found that the time averaged zonal mean structure and circulation of the troposphereat middle and high latitudes can be reproduced basically in terms of the mass and momentum balances in geostrophicwave circulations. | Y.L.McHall Department of Earth,Atmospheric and Planetary Sciences,MIT,MA 02139,USA | 1993 | Acta meteorologica Sinica1993，7，2： | 5 |
| 2 | Wintertime Stratospheric Anomalies-Part II: Sudden Warmings显示文摘The process of stratospheric sudden warmings from development of planetary waves to.the sudden cooling after reversal of mean zonal circulation will be studied with the primitive equations of heat and momentum balances. It will be explained that the sudden warmings may occur only in the polar regions of winter stratosphere where zonal mean temperature decreases poleward. The heating rate in the order of major warmings is produced by developed planetary waves in the stratospheric breaking layers. The particular perturbation structure characterized by large amplitude of wave 1 together with minimum of wave 2 discovered by Labitzke (1977) is crucial for initiation of major warmings. The cooling by the same mechanism can be produced in the regions with reversed mean temperature gradient. | Y.L.McHall | 1992 | Advances in Atmospheric Sciences1992，9，3： | 3 |
| 3 | Wintertime Stratospheric Anomalies-Part I: Warm Pools显示文摘The stratospheric worm pools, called the 4-day wave also, are mainly the temperature anomalies in the polar regions of winter hemisphere. It will be shown that their occurrence, propagation speed and specific structure can be explained by the lower frequency coherent heating resulting from the wave interaction in the breaking layers of the stratosphere. Although their vertical phase slope is negligibly small, the warm pools cannot be considered as a barotropic anomaly. | Y.L.McHall | 1992 | Advances in Atmospheric Sciences1992，9，3： | 2 |
| 4 | Energetics Constraint for Linear Disturbances Development显示文摘In development of baroclinic disturbances, baroclinity of basic temperature field varies with conversion of available potential energy. The growth rate which depends on the baroclinity varies as well. However, in previous linear theories, the growth rate was considered constant, so development of disturbances was not constrained by energy sources in the linear theories. In terms of energy conservation and conversion in an isolated atmosphere, we may study the variations in the baroclinity and growth rate and draw the corresponding pictures of perturbation developments in the varying environments. The amplification for the most unstable Eady wave is discussed as an example. It will be found that growth of baroclinic perturbations constrained by energy conservation is significantly different from the growth at the initial constant rate after mature stage. | Y.L.McHall | 1993 | Advances in Atmospheric Sciences1993，10，3： | 0 |
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