Meteotsunami observed in Japan following the Hunga Tonga eruption in 2022 investigated using a one-dimensional shallow-water model

IF 1.7 4区地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES

Sola Pub Date : 2022-01-28 DOI:10.31223/x5ks78

Shion Sekizawa, T. Kohyama

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引用次数: 14

Abstract

On January 15, 2022, the volcano Hunga Tonga about 8000-km away from Japan explosively erupted. Following the eruption, tsunami-like sea-level fluctuations were observed in Japan, much earlier than expected based on the oceanic long-wave propagation from Tonga to Japan. By contrast, atmospheric pressure disturbance presumably due to the eruption was also observed about 30 minutes before the sea-level change. Therefore,the observed sea-level fluctuations can be considered as meteotsunamis forced by the pressure perturbation rather than tectonically forced by the eruption, but the mechanism is not yet fully understood.This study attempts to understand the nature of this meteotsunami by using a simple one-dimensional shallow-water model. The results show that the time and amplitude of the observed sea-level changes are consistent with the simulated sea-level changes forced by the atmospheric forcing. A set of experiments with different bathymetry profiles also reveals the importance of amplification due to Proudman resonance over deep basins and the shoaling effect over the continental slope, while extremely deep and narrow topography such as trenches is of second-order importance.

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利用一维浅水模型研究了2022年兴加汤加火山爆发后在日本观测到的海啸

2022年1月15日，距离日本约8000公里的兴加汤加火山爆发。火山爆发后，日本观测到类似海啸的海平面波动，比根据汤加到日本的海洋长波传播预测的要早得多。相比之下，在海平面变化前30分钟左右也观测到可能由火山喷发引起的大气压力扰动。因此，观测到的海平面波动可以认为是压力扰动造成的气象海啸，而不是火山喷发造成的构造强迫，但其机制尚不完全清楚。这项研究试图通过使用一个简单的一维浅水模型来了解这次海啸的本质。结果表明，观测到的海平面变化的时间和幅度与模拟的海平面在大气强迫作用下的变化基本一致。一系列不同测深剖面的实验也揭示了深层盆地上由Proudman共振引起的放大效应和大陆斜坡上的浅滩效应的重要性，而极深和狭窄的地形(如海沟)的重要性次之。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sola 地学-气象与大气科学

CiteScore

3.50

自引率

21.10%

发文量

审稿时长

>12 weeks

期刊介绍： SOLA (Scientific Online Letters on the Atmosphere) is a peer-reviewed, Open Access, online-only journal. It publishes scientific discoveries and advances in understanding in meteorology, climatology, the atmospheric sciences and related interdisciplinary areas. SOLA focuses on presenting new and scientifically rigorous observations, experiments, data analyses, numerical modeling, data assimilation, and technical developments as quickly as possible. It achieves this via rapid peer review and publication of research letters, published as Regular Articles. Published and supported by the Meteorological Society of Japan, the journal follows strong research and publication ethics principles. Most manuscripts receive a first decision within one month and a decision upon resubmission within a further month. Accepted articles are then quickly published on the journal’s website, where they are easily accessible to our broad audience.