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首页> 外文期刊>Journal of the Atmospheric Sciences >Water Vapor Budget in a Developing Tropical Cyclone and Its Implication for Tropical Cyclone Formation
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Water Vapor Budget in a Developing Tropical Cyclone and Its Implication for Tropical Cyclone Formation

机译：发展中国家热带气旋的水汽收支及其对热带气旋形成的影响

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Evolution of the water vapor budget from the tropical wave stage to the tropical cyclone stage is examined using a high-resolution numericalmodel simulation. The focus is on a time window from 27 h prior to genesis to 9 h after genesis, and the diagnoses are carried out in the framework of themarsupial paradigm. Analysis shows that the vertically integrated inward moisture flux accounts for a majority of the total condensation and that its fractional contribution increases from the tropical wave stage to the tropical cyclone stage. The fractional contribution of the local evaporation ismuch smaller and decreases from the tropical wave stage to the tropical cyclone stage. It is also shown that the radial moisture flux above 850 hPa is rather weak prior to genesis but increases significantly after genesis because of the deepening of the inflow layer. The decrease in the fractional contribution of the local evaporation, or the increase in the fractional contribution of the vertically integrated inward moisture flux, is due to the strengthening of the low-level convergence associated with the secondary circulation. The intensification of the secondary circulation can be attributed to the organized convection and concentrated diabatic heating near the circulation center. The results suggest that the local evaporation and its positive interaction with the primary circulation may not be as important as generally appreciated for tropical cyclone development. By contrast, the increase in the fractional contribution by the inward moisture flux with the storm intensification implies the importance of the positive feedback among the primary circulation, the secondary circulation, and convection for tropical cyclone development.
机译：使用高分辨率数值模型模拟研究了水汽收支从热带波阶段到热带气旋阶段的演变。重点是从发生前27小时到发生后9小时的时间窗口，并且诊断在有袋范例的框架内进行。分析表明，垂直积分的向内水分通量占总凝结量的大部分，其分数贡献从热带波浪阶段到热带气旋阶段增加。从热带波浪阶段到热带气旋阶段，局部蒸发的分数贡献要小得多，并且减小。还显示出，在850 hPa以上的径向水分通量在成因之前相当弱，但在成因之后由于流入层的加深而显着增加。局部蒸发分数贡献的减少，或垂直积分向内水分通量的分数贡献的增加，是由于与二次循环有关的低层收敛的加强。二次循环的加剧可归因于循环中心附近的有组织对流和集中绝热加热。结果表明，局部蒸发及其与一次循环的积极相互作用可能不如热带气旋发展普遍认为的重要。相比之下，暴风雨加剧导致的向内水汽通量的分数贡献增加，意味着一次循环，二次循环和对流对热带气旋发展的正反馈的重要性。

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