Evolution and Frontogenesis of an Imbalanced Flow —the Influence of Vapor Distribution and Orographic Forcing

Wang Yunfeng; Wu Rongsheng; Pan Yinong

doi:10.1007/s00376-000-0008-7

Impact Factor: 5.8

Volume 17 Issue 2

Apr. 2000

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2000 > 17(2): 256-274

Evolution and Frontogenesis of an Imbalanced Flow —the Influence of Vapor Distribution and Orographic Forcing

1.
Laboratory of Mesoscale Severe Weather, Nanjing University, Nanjing 210093,Laboratory of Mesoscale Severe Weather, Nanjing University, Nanjing 210093,Laboratory of Mesoscale Severe Weather, Nanjing University, Nanjing 210093

doi: 10.1007/s00376-000-0008-7

Abstract
References
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Abstract:
If the initial fields are not in geostrophic balance, the adjustment and evolution will occur in the stratified fluid, and the frontogenesis will occur under suitable conditions. The evolution is studied here with a nonhydrostatic fully compressible meso-scale model (Advanced Regional Prediction System, ARPS). Four cases are designed and compared: (i) control experiment; (ii) with different initial temperature gradient; (iii) with vapor distribution; (iv) with orographic forcing. The results show that: (1) there is an inertial oscillation in the evolution of the imbalanced flow with the frequency of the local Coriolis f, and with its amplitude de-creasing with time. The stationary balanced state can only be approached as it cannot be reached in the limit duration of time, The energy conversion ratio varies in the range of [0, 1 / 3]; (2) the stronger initial tempera-ture gradient can make the final energy conversion ratio higher, and vice versa; (3) suitable vapor distribu-tion is favorable for the frontogenesis. It will bring forward the time of the frontogenesis, strengthen the in-tensity of the cold front, and influence the final energy conversion ratio; (4) the orographic forcing has an ev-idently strengthening effect on the frontogenesis. The strengthening effect on the frontogenesis and the influ-ence on the final energy conversion ratio depend on the relative location of the mountain to the cold front.
- Evolution,
- Frontogenesis,
- Inertial oscillation,
- Vapor distribution and orographic forcing
References

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Manuscript History

Manuscript received: 10 April 2000

Manuscript revised: 10 April 2000

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Evolution and Frontogenesis of an Imbalanced Flow —the Influence of Vapor Distribution and Orographic Forcing

1. Laboratory of Mesoscale Severe Weather, Nanjing University, Nanjing 210093,Laboratory of Mesoscale Severe Weather, Nanjing University, Nanjing 210093,Laboratory of Mesoscale Severe Weather, Nanjing University, Nanjing 210093

Manuscript received: 2000-04-10
Manuscript revised: 2000-04-10

Abstract: If the initial fields are not in geostrophic balance, the adjustment and evolution will occur in the stratified fluid, and the frontogenesis will occur under suitable conditions. The evolution is studied here with a nonhydrostatic fully compressible meso-scale model (Advanced Regional Prediction System, ARPS). Four cases are designed and compared: (i) control experiment; (ii) with different initial temperature gradient; (iii) with vapor distribution; (iv) with orographic forcing. The results show that: (1) there is an inertial oscillation in the evolution of the imbalanced flow with the frequency of the local Coriolis f, and with its amplitude de-creasing with time. The stationary balanced state can only be approached as it cannot be reached in the limit duration of time, The energy conversion ratio varies in the range of [0, 1 / 3]; (2) the stronger initial tempera-ture gradient can make the final energy conversion ratio higher, and vice versa; (3) suitable vapor distribu-tion is favorable for the frontogenesis. It will bring forward the time of the frontogenesis, strengthen the in-tensity of the cold front, and influence the final energy conversion ratio; (4) the orographic forcing has an ev-idently strengthening effect on the frontogenesis. The strengthening effect on the frontogenesis and the influ-ence on the final energy conversion ratio depend on the relative location of the mountain to the cold front.

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