t千百年来,台风对我中国东南沿海地区区每年造成巨大的经济损失和人员伤亡,你知道产生台风的三大条件吗?

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THE THEORY OF MOIST POTENTIAL VORTICITY AND ITS APPLICATION IN THE DIAGNOSIS OF TYPHOON RAINFALL AND INTENSITY
This paper tests the impacts of cloud-induced mass forcing on the moist potential vorticity (MPV) anomaly associated with torrential rains caused by Typhoon No.9914 (Dan) by using fine model simulation data outputted by the Fifth-Generation NCAR / Penn State Mesoscale Model (MM5). The diagnostic results show that the positive MPV anomaly region, which is obtained by integrating the MPV from 600 hPa to 300 hPa in the vertical, roughly coincides with the precipitation at their synchronous stages either in position or in the distribution pattern, and the maximum positive MPV area of Dan is located mainly between 600 hPa and 300 hPa, which is much higher than torrential rain cases. Further analyses also showed that the value of positive MPV anomaly increased or decreased with the development of Dan, and the positive MPV anomaly may also be served as a tracer to indicate the evolution of tropical cyclone intensity.
GAO Shou-ting
作者单位:
National Meteorological Center,Beijing 100081 China
Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 China
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国家重点基础研究发展规划(973计划),国家自然科学基金,NMC-TIGGE Program,Project of State Key Laboratory of Severe Weather
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Factors and aspects of the damage to greenhouses in Nara prefecture by a typhoon (T9807)
Kurozumi, T.; Kakuyama, M.; Otuji, J., 1999: Factors and aspects of the damage to greenhouses in Nara prefecture by a typhoon (T9807). Bulletin of the Nara Agricultural Experiment Station ( 30): 33-42
The damage caused to greenhouses in Nara prefecture (Japan) by a typhoon (T9807) that hit the area directly were investigated. A comparison of the damage to 3 types of greenhouse was conducted. Greenhouses of pipe-frame structure were damaged the most, greenhouses of pipe-frame reinforced with steel-frame (AP-houses) suffered medium damage, while greenhouses of steel-frame structure were only damaged slightly.
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