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Modified Richardson Number in Non-Uniform Saturated Moist Flow |
| YANG Shuai1,2;GAO Shou-Ting1 |
| 1Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
2Graduate University of the Chinese Academy of Sciences, Beijing 100049 |
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| Cite this article: |
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YANG Shuai, GAO Shou-Ting 2006 Chin. Phys. Lett. 23 3003-3006 |
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Abstract As a useful index, i.e. the Richardson number Ri, is modified in non-uniform saturated moist flow, based on the fact that liquid water is partially dropped out in parcel air. This is more realistic in real moist atmosphere, especially in the rainfall process. The modified Ri presents adequately the influence of numerator, i.e. Brunt--Vaisala frequency (BVF), on instability. Compared to several former formulae generalized by Durran and Klemp, the modified Ri evidently decreases the stability in rainy regions. In theory, the modified BVF and Ri fix the discontinuity of latent heat release in the transition areas between saturated and unsaturated air by introducing the condensation probability function. Furthermore, the diagnostic analysis of the modified Ri validates the rationality of its application in the non-uniform sturated moist process.
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| Keywords:
47.20.Ft
47.20.Lz
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Published: 01 November 2006
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| PACS: |
47.20.Ft
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(Instability of shear flows (e.g., Kelvin-Helmholtz))
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47.20.Lz
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(Secondary instabilities)
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