An Examination of Tropical Cyclone Position, Intensity, and Intensity Life Cycle within Atmospheric Reanalysis Datasets
An Examination of Tropical Cyclone Position, Intensity, and Intensity Life Cycle within Atmospheric Reanalysis Datasets
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DOI：
10.1175/2011jcli4208.1
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发表时间：
2012-05-01
影响因子：
4.9
通讯作者：
Hart, Robert E.
中科院分区：
文献类型：
--
作者：
Schenkel, Benjamin A.;Hart, Robert E.
下面的研究检查热带气旋（TC）的位置和强度的差异之间的最佳跟踪和五个大气再分析数据集，以评估再分析是适当的研究TC的程度。虽然再分析TC强度和位置存在显着差异，但再分析中TC强度的表示被认为是最有问题的，因为它被低估了，超出了仅归因于粗网格分辨率的范围。此外，平均生命周期内再分析的标准化TC强度揭示了低估的峰前强化率，以及在峰值强度相对于最佳轨道的延迟。最佳跟踪和再分析TC强度和位置之间的这些差异可以通过与最佳跟踪TC年龄、最佳跟踪TC强度、最佳跟踪TC位置和扩展最佳跟踪TC大小等参数的相关性来进一步描述。具体而言，40年欧洲中期天气预报中心（ECMWF）再分析（ERA-40）、ECMWF中期再分析（ERA-I）和现代研究和应用回顾分析（MERRA）中的TC位置差异显示出统计学上的显著相关性（0.27
The following study examines the position and intensity differences of tropical cyclones (TCs) among the Best-Track and five atmospheric reanalysis datasets to evaluate the degree to which reanalyses are appropriate for studying TCs. While significant differences are found in both reanalysis TC intensity and position, the representation of TC intensity within reanalyses is found to be most problematic owing to its underestimation beyond what can be attributed solely to the coarse grid resolution. Moreover, the mean life cycle of normalized TC intensity within reanalyses reveals an underestimation of both prepeak intensification rates as well as a delay in peak intensity relative to the Best-Track. These discrepancies between Best-Track and reanalysis TC intensity and position can further be described through correlations with such parameters as Best-Track TC age, Best-Track TC intensity, Best-Track TC location, and the extended Best-Track TC size. Specifically, TC position differences within the 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40), ECMWF Interim Re-Analysis (ERA-I), and Modern Era Retrospective-Analysis for Research and Applications (MERRA) exhibit statistically significant correlations (0.27