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Statistical Reconstruction of Seasonal Tropical Cyclone Variability in the North Atlantic Basin
Journal of Geophysical Research: Atmospheres ( IF 4.4 ) Pub Date : 2020-12-22 , DOI: 10.1029/2020jd032669
Matthew Lee Titus 1, 2 , Keith R. Thompson 3 , Eric C. J. Oliver 3 , Philip J. Klotzbach 4
Affiliation  

Seasonal forecasting of tropical cyclones is a topic of considerable interest to the public, government and private sectors. To improve understanding of the dynamics controlling the predictability of tropical cyclone (TC) activity, and improve the accuracy of forecasts, multiple studies have related TC activity to empirically‐defined indices including the El Niño‐Southern Oscillation, the Atlantic Multidecadal Oscillation, and the North Atlantic Oscillation. These indices were not developed to forecast TC activity but rather summarize other aspects of atmosphere‐ocean variability. In this study we use a statistical approach, based on redundancy analysis, to define two indices related to overall activity and steering of TCs. We focus on North Atlantic TCs that reached tropical storm strength (≥34 kt) between August and October 1948–2016. TC occurrences are binned using an equal area grid that covers the North Atlantic. The redundancy indices are linear combinations of mean sea level pressure for the same season. Cross validation is used to guard against over fitting in the definition of the indices. This approach provides two physically interpretable redundancy indices related to North Atlantic TC activity. The leading redundancy index is used to successfully reconstruct the total number of TCs and the accumulated cyclone energy, over the extended period 1878–2014 using seasonal mean sea level pressures from the National Centers for Environmental Prediction 20th‐Century Reanalysis version 2c. Extensions of the approach for seasonal forecasting are discussed.

中文翻译:

北大西洋盆地季节性热带气旋变化的统计重建

热带气旋的季节性预报是公共,政府和私营部门相当感兴趣的话题。为了更好地了解控制热带气旋(TC)活动可预测性的动力学并提高预报的准确性,多项研究已将TC活动与根据经验定义的指标相关联,包括厄尔尼诺-南方涛动,大西洋多年代际涛动和北大西洋涛动。这些指数并不是为了预测热带气旋活动而开发的,而是总结了大气-海洋变化的其他方面。在这项研究中,我们使用基于冗余分析的统计方法来定义两个与总体活动和TC指导相关的指标。我们重点研究在1948年至2016年10月之间达到热带风暴强度(≥34 kt)的北大西洋TC。使用覆盖北大西洋的等面积网格对TC发生进行分类。冗余指数是同一季节平均海平面压力的线性组合。交叉验证用于防止索引定义过度拟合。这种方法提供了两个与北大西洋热带气旋活动有关的可物理解释的冗余指数。利用国家环境预测中心20世纪再分析2c版的季节性平均海平面压力,领先的冗余指数可用于成功重建1878–2014年期间的TC总数和气旋的累积能量。讨论了季节性预测方法的扩展。冗余指数是同一季节平均海平面压力的线性组合。交叉验证用于防止索引定义过度拟合。这种方法提供了两个与北大西洋热带气旋活动有关的可物理解释的冗余指数。利用国家环境预测中心20世纪再分析2c版的季节性平均海平面压力,领先的冗余指数可用于成功重建1878–2014年期间的TC总数和气旋的累积能量。讨论了季节性预测方法的扩展。冗余指数是同一季节平均海平面压力的线性组合。交叉验证用于防止索引定义过度拟合。这种方法提供了两个与北大西洋热带气旋活动有关的可物理解释的冗余指数。利用国家环境预测中心20世纪再分析2c版的季节性平均海平面压力,领先的冗余指数可用于成功重建1878–2014年期间的TC总数和气旋的累积能量。讨论了季节性预测方法的扩展。这种方法提供了两个与北大西洋热带气旋活动有关的可物理解释的冗余指数。利用国家环境预测中心20世纪再分析2c版的季节性平均海平面压力,领先的冗余指数可用于成功重建1878–2014年期间的TC总数和气旋的累积能量。讨论了季节预测方法的扩展。这种方法提供了两个与北大西洋热带气旋活动有关的可物理解释的冗余指数。利用国家环境预测中心20世纪再分析2c版的季节性平均海平面压力,领先的冗余指数可用于成功重建1878–2014年期间的TC总数和气旋的累积能量。讨论了季节预测方法的扩展。
更新日期:2021-02-18
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