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Performance of the Adriatic early warning system during the multi-meteotsunami event of 11–19 May 2020: an assessment using energy banners
Natural Hazards and Earth System Sciences ( IF 4.6 ) Pub Date : 2021-08-18 , DOI: 10.5194/nhess-21-2427-2021
Iva Tojčić , Cléa Denamiel , Ivica Vilibić

This study quantifies the performance of the Croatian meteotsunami early warning system (CMeEWS) composed of a network of air pressure and sea level observations, a high-resolution atmosphere–ocean modelling suite, and a stochastic surrogate model. The CMeEWS, which is not operational due to a lack of numerical resources, is used retroactively to reproduce the multiple events observed in the eastern Adriatic between 11 and 19 May 2020. The performances of the CMeEWS deterministic models are then assessed with an innovative method using energy banners based on temporal and spatial spectral analysis of the high-pass-filtered air pressure and sea level fields. It is found that deterministic simulations largely fail to forecast these extreme events at endangered locations along the Croatian coast, mostly due to a systematic northwestward shift of the atmospheric disturbances. Additionally, the use of combined ocean and atmospheric model results, instead of atmospheric model results only, is not found to improve the selection of the transects used to extract the atmospheric parameters feeding the stochastic meteotsunami surrogate model. Finally, in operational mode, the stochastic surrogate model would have triggered the warnings for most of the observed events but also set off some false alarms. Due to the uncertainties associated with operational modelling of meteotsunamigenic disturbances, the stochastic approach has thus proven to overcome the failures of the deterministic forecasts and should be further developed.

中文翻译:

2020 年 5 月 11 日至 19 日多气象海啸事件期间亚得里亚海预警系统的性能:使用能源横幅的评估

本研究量化了克罗地亚气象海啸预警系统 (CMeEWS) 的性能,该系统由气压和海平面观测网络、高分辨率大气-海洋建模套件和随机替代模型组成。由于缺乏数值资源而无法运行的 CMeEWS 被追溯用于重现 2020 年 5 月 11 日至 19 日在亚得里亚海东部观测到的多个事件。然后使用创新方法评估 CMeEWS 确定性模型的性能,使用基于高通滤波气压和海平面场的时空光谱分析的能量横幅。发现确定性模拟在很大程度上无法预测克罗地亚海岸沿线濒危地点的这些极端事件,主要是由于大气扰动的系统性向西北移动。此外,未发现使用组合的海洋和大气模型结果,而不是仅使用大气模型结果,不能改进用于提取大气参数的横断面选择,这些参数提供给随机气象海啸替代模型。最后,在操作模式下,随机代理模型会触发大多数观察到的事件的警告,但也会引发一些误报。由于与气象海啸扰动的操作建模相关的不确定性,因此随机方法已被证明可以克服确定性预测的失败,应进一步发展。而不是仅大气模型结果,没有发现改善用于提取大气参数的断面选择,这些参数提供给随机meteotsunami 替代模型。最后,在操作模式下,随机代理模型会触发大多数观察到的事件的警告,但也会引发一些误报。由于与气象海啸扰动的操作建模相关的不确定性,因此随机方法已被证明可以克服确定性预测的失败,应进一步发展。而不是仅大气模型结果,没有发现改善用于提取大气参数的断面选择,这些参数提供给随机meteotsunami 替代模型。最后,在操作模式下,随机代理模型会触发大多数观察到的事件的警告,但也会引发一些误报。由于与气象海啸扰动的操作建模相关的不确定性,因此随机方法已被证明可以克服确定性预测的失败,应进一步发展。随机代理模型会触发大多数观察到的事件的警告,但也会引发一些误报。由于与气象海啸扰动的操作建模相关的不确定性,因此随机方法已被证明可以克服确定性预测的失败,应进一步发展。随机代理模型会触发大多数观察到的事件的警告,但也会引发一些误报。由于与气象海啸扰动的操作建模相关的不确定性,因此随机方法已被证明可以克服确定性预测的失败,应进一步发展。
更新日期:2021-08-19
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