Statistics for size and radial wind profile of tropical cyclones in the western North Pacific

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• 作者：Xiaoqin Lu ; Hui Yu ; Xiaotu Lei
• 关键词：size ; radial wind profile ; tropical cyclone
• 刊名：Journal of Meteorological Research
• 出版年：2011
• 出版时间：February 2011
• 年：2011
• 卷：25
• 期：1
• 页码：104-112
• 全文大小：754 KB
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• 作者单位：Xiaoqin Lu (1)
  Hui Yu (1)
  Xiaotu Lei (1)
  
  1. Shanghai Typhoon Institute/Laboratory of Typhoon Forecast Technique, CMA, Shanghai, 200030, China
  
• 刊物类别：Atmospheric Sciences; Meteorology; Geophysics and Environmental Physics; Atmospheric Protection/Air
• 刊物主题：Atmospheric Sciences; Meteorology; Geophysics and Environmental Physics; Atmospheric Protection/Air Quality Control/Air Pollution;
• 出版者：The Chinese Meteorological Society
• ISSN：2198-0934

文摘

The 6-yr best-track data of tropical cyclones (TCs) in the western North Pacific are used to study the statistical features of TC size and radial wind profile. A TC size is defined as the azimuthal mean radius of 34-kt surface wind. On average, the TCs in the western North Pacific have a size of 203 km, and the size is larger for stronger TCs. Further analyses show that larger TCs tend to move faster than smaller ones, with a 23-4 km difference in size corresponding to a difference of about 10 km h in moving speed. The TCs that recurve from westward to eastward moving have a mean size of 218 km, significantly larger than that of those without a turning point (179 km). Regional TC distributions demonstrate that the TCs affecting the Korean Peninsula and southwestern Japan have the largest mean size (250-80 km). There are also some large TCs affecting southern Philippines, while TCs over the South China Sea are generally small in size. Comparison of intensity and size of all TCs during their lifespan demonstrates that a TC tends to reach its maximum size 6 h after it reaches its maximum intensity, and the decrease rate of size during the weakening stage of a TC is much smaller than the increase rate of size during its developing stage. Thus, linear regression relations between TC size and intensity are established for its developing and weakening stages respectively, which can be used as a forecast tool for TC size. Features of TC radial wind profile are studied by analyzing a parametric wind model based on the radius data of 34-, 50-, and 64-kt surface winds. The results show that the shape parameter d most frequently takes the values of 0.3, 0.4, and 0.5. It generally increases (decreases) as the TC develops (weakens), implying a sharper (flatter) radial wind profile. Changes in d leads the tendency of intensity. The two parameters for the asymmetric model, namely p and q, are mostly 0.85-.05 and 0-.2, respectively, embodying the fact that the asymmetric component is generally much smaller than the symmetric component. The asymmetry in 34-kt surface wind is much stronger than that in 50- and 64-kt surface winds, with the maximum radius often in the northeast quadrant. Key words size radial wind profile tropical cyclone