Sensitivities of a cyclone detection and tracking algorithm: individual tracks and climatology
Sensitivities of a cyclone detection and tracking algorithm: individual tracks and climatology
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DOI：
10.1127/0941-2948/2005/0068
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发表时间：
2005-12
影响因子：
1.2
通讯作者：
J. Pinto;T. Spangehl;U. Ulbrich;P. Speth
中科院分区：
文献类型：
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作者：
J. Pinto;T. Spangehl;U. Ulbrich;P. Speth
通过应用天气尺度气旋检测和跟踪算法来评估北半球气旋活动，以获取平均海平面压力数据。该方法最初是为南半球开发的，现已适用于北半球冬季。使用 1958/59 至 1997/98 的 NCEP-再分析数据作为输入。从案例研究和气候学角度讨论了结果对算法特定参数的敏感性。结果表明，设置的选择具有重要意义，特别是对于跟踪较小规模和快速移动的系统。通过适当的设置，该算法能够同时自动跟踪不同类型的气旋：可以评估大型洋盆上快速移动和发展的系统以及地中海盆地上的较小规模气旋。气旋变量的气候学，例如气旋轨迹密度、气旋计数、增强率、传播速度以及气旋发生和溶解的面积，提供了不同地区典型气旋生命周期的详细信息。输入数据的空间和时间分辨率从全分辨率 T62/06h 降低到 T42/12h 降低了旋风分离器轨道密度和旋风分离器计数。仅降低时间分辨率就会导致快速移动系统数量的减少，这与旋风轨迹密度相关。单独降低空间分辨率主要是减少弱气旋的数量。
Northern Hemisphere cyclone activity is assessed by applying an algorithm for the detection and tracking of synoptic scale cyclones to mean sea level pressure data. The method, originally developed for the Southern Hemisphere, is adapted for application in the Northern Hemisphere winter season. NCEP-Reanalysis data from 1958/59 to 1997/98 are used as input. The sensitivities of the results to particular parameters of the algorithm are discussed for both case studies and from a climatological point of view. Results show that the choice of settings is of major relevance especially for the tracking of smaller scale and fast moving systems. With an appropriate setting the algorithm is capable of automatically tracking different types of cyclones at the same time: Both fast moving and developing systems over the large ocean basins and smaller scale cyclones over the Mediterranean basin can be assessed. The climatology of cyclone variables, e.g., cyclone track density, cyclone counts, intensification rates, propagation speeds and areas of cyclogenesis and -lysis gives detailed information on typical cyclone life cycles for different regions. The lowering of the spatial and temporal resolution of the input data from full resolution T62/06h to T42/12h decreases the cyclone track density and cyclone counts. Reducing the temporal resolution alone contributes to a decline in the number of fast moving systems, which is relevant for the cyclone track density. Lowering spatial resolution alone mainly reduces the number of weak cyclones.