Global climatology of rainfall rates and lifetime accumulated rainfall in tropical cyclones: Influence of cyclone basin, cyclone intensity and cyclone size
Global climatology of rainfall rates and lifetime accumulated rainfall in tropical cyclones: Influence of cyclone basin, cyclone intensity and cyclone size
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DOI：
10.1002/joc.6763
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发表时间：
2020-08-18
期刊：
影响因子：
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通讯作者：
McBride, John L.
中科院分区：
文献类型：
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作者：
Lavender, Sally L.;McBride, John L.
利用热带降雨测量使命（TRMM）多卫星降水分析（TMPA）产品提供的17年3小时、0.25度分辨率降水数据，编制热带气旋（TC）降水的全球气候学。由于非常largesSD的降雨在每个分层的强度等级或气旋盆地，我们的方法集中在不同的降雨率类别的频率分布和百分比表示。结果表明，热带气旋的降水气候特征主要取决于三个相互关联的因子：热带气旋强度、热带气旋大小和热带气旋流域。这三个相互依存的审查。TC强度等级在不同流域的分布并不是某些流域（西北太平洋，北大西洋）具有比其他流域（东北太平洋，南印度）更高的TC降雨率的重要贡献者。与此相反，TC大小级别在流域之间的分布是一个显着的贡献，为什么一些流域比其他流域更潮湿。气候学也提出了在TC的终身累积降雨量（LAR）。记录LAR属于2004年的飓风伊万，在0-350公里半径范围内降雨量为300公里，在0-500公里范围内降雨量为432公里。最大的LAR值几乎只出现在两个气旋盆地：西北太平洋和北大西洋。不出所料，LAR主要由TC持续时间决定，占方差的70%左右。检查整个17年的数据集显示，在所有流域，除东北太平洋的中值和极端TC降雨率下降的趋势。然而，这种下降的机制尚未确定，可能主要是由于样本量或数据的不均匀性。这些趋势与根据物理原理所预期的趋势之间的差异是我们希望其他研究人员能够关注的问题。
Seventeen years of 3-hr, 0.25 degrees resolution, precipitation data from the Tropical Rainfall Measurement Mission (TRMM) multi-satellite precipitation analysis (TMPA) product are used to develop a global climatology of precipitation in tropical cyclones (TCs). Due to very largeSDs for rainfall in each stratification by intensity class or cyclone basin, our methodology concentrates on frequency distributions and percentage representation in different rainfall rate categories. The stratifications reveal that the TC rainfall climatologies are dependent on three inter-related factors: TC intensity, TC size and TC basin. The interdependence of the three is examined. The distributions of TC intensity classes in the different basins are not a significant contributor to the fact that certain basins (Northwest Pacific, North Atlantic) have higher TC rainfall rates than other basins (Northeast Pacific, South Indian). In contrast to this, the distributions of TC size classes between basins are a significant contributor to why some basins are wetter than others. A climatology is also presented of lifetime accumulated rainfall (LAR) in TCs. The record LAR belongs to hurricane Ivan in 2004, with 300 km(3)of rain over the 0-350 km radius, and 432 km(3)over 0-500 km. The largest LAR values occur almost exclusively in two cyclone basins: The Northwest Pacific and the North Atlantic. Not unexpectedly, LAR is determined primarily by TC duration, which accounts for around 70% of the variance. Examination of the full 17-year dataset reveals a decreasing trend in both median and extreme TC rainfall rates in all basins except the Northeast Pacific. However, mechanisms responsible for this decrease are yet to be identified and may be primarily due to the sample size or data inhomogeneities. The difference between the trends and those expected from physical principles is a concern which we hope will be taken up by other investigators.