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Modulation of mid-Atlantic tropical cyclone landfalls by the Madden-Julian Oscillation
Weather and Climate Extremes ( IF 6.1 ) Pub Date : 2021-10-07 , DOI: 10.1016/j.wace.2021.100387
Julia V. Manganello 1 , James L. Kinter 1
Affiliation  

Tropical cyclone (TC) landfalls over the U.S. mid-Atlantic region are very infrequent. However, when they do occur, the resulting human and material losses can be severe, as was the case with Hurricane Sandy in 2012. Therefore, it is important to predict these land-falling events as far in advance as possible. In this study, we investigate the relationship between mid-Atlantic TC landfalls and the Madden-Julian Oscillation (MJO), which is the dominant source of climate variability in the tropics on intraseasonal time scales. This is largely accomplished by using a high-atmospheric-resolution ensemble prediction system based on the European Centre for Medium-Range Weather Forecasts (ECMWF) operational model (Project Minerva) to compile the statistics of these rare events, and the velocity potential MJO (VPM) index to define the phase and amplitude of the MJO. We find that at longer lead times (between 14 and 7 days prior to landfall), statistically significant peak landfall probabilities are present during MJO phases 1 and 7 and, to some extent, phase 8. This result is largely supported by observational data. At shorter lead times (between 6-day lead and landfall), phase 1 is strongly favored with some contribution from phases 2 and 3. These findings suggest a potential for extended-range predictions of the mid-Atlantic TC landfall risk based on the phase of the MJO.



中文翻译:

马登-朱利安振荡对大西洋中部热带气旋登陆的调制

热带气旋 (TC) 在美国大西洋中部地区登陆的频率非常低。然而,当它们确实发生时,由此产生的人员和物质损失可能会很严重,就像 2012 年的飓风桑迪一样。因此,尽可能提前预测这些登陆事件非常重要。在这项研究中,我们调查了大西洋中部 TC 登陆与马登-朱利安涛动 (MJO) 之间的关系,马登-朱利安涛动 (MJO) 是季内时间尺度上热带气候变率的主要来源。这主要是通过使用基于欧洲中期天气预报中心 (ECMWF) 业务模型 (Project Minerva) 的高大气分辨率集合预测系统来编制这些罕见事件的统计数据来实现的,和速度势 MJO (VPM) 指数来定义 MJO 的相位和幅度。我们发现,在较长的提前期(登陆前 14 到 7 天之间),在 MJO 阶段 1 和 7 以及在某种程度上,在第 8 阶段存在统计上显着的峰值登陆概率。这一结果在很大程度上得到了观测数据的支持。在较短的提前期(提前 6 天到登陆之间),第 1 阶段受到强烈支持,第 2 阶段和第 3 阶段有一些贡献。 MJO 的。这一结果在很大程度上得到了观测数据的支持。在较短的提前期(提前 6 天到登陆之间),第 1 阶段受到强烈支持,第 2 阶段和第 3 阶段有一些贡献。 MJO 的。这一结果在很大程度上得到了观测数据的支持。在较短的提前期(提前 6 天到登陆之间),第 1 阶段受到强烈支持,第 2 阶段和第 3 阶段有一些贡献。 MJO 的。

更新日期:2021-10-08
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