气候变化领域集成服务门户(CCPortal): Meteorological Tsunami Generation Due to Sea-Surface Pressure Change: Three-Dimensional Theory and Synthetics of Ocean-Bottom Pressure Change

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DOI	10.1029/2020JC017011
	Meteorological Tsunami Generation Due to Sea-Surface Pressure Change: Three-Dimensional Theory and Synthetics of Ocean-Bottom Pressure Change
	Saito T.; Kubota T.; Chikasada N.Y.; Tanaka Y.; Sandanbata O.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	Although most tsunamis are generated by the sea-bottom deformation caused by earthquakes, some tsunamis are excited by sea-surface pressure changes. This study theoretically investigated tsunamis generated by sea-surface pressure changes and derived the solutions in three-dimensional (3-D) space, whereas most past studies employed two-dimensional equations. Using the solutions, we simulated and visualized tsunami generation by a growing pressure change. Negative pressure change made the sea surface uplifted inside the source region and negative leading waves were radiated from the source region. We also simulated the tsunami generation when the pressure change at the sea surface moves at almost the same speed as the tsunami propagation speed. The tsunami height increased with increasing travel distance, including the dispersion effects. The 3-D solutions in this study, including vertical velocity distribution, indicate that both tsunami height and sea-surface pressure changes contribute to ocean-bottom pressure changes, suggesting the difficulty in measuring tsunami height with ocean-bottom pressure observations. When the pressure change source was characterized by short-wavelength components, the dispersion sometimes possibly increased the tsunami height more extensively than the nondispersive tsunamis. The 3-D solutions are necessary for describing tsunami generation where the long-wave approximations are not applicable in open oceans. © 2021. The Authors.
英文关键词	Generation; meteorological tsunami; meteotsunami; theory; tsunami
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186338
作者单位	National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
推荐引用方式 GB/T 7714	Saito T.,Kubota T.,Chikasada N.Y.,et al. Meteorological Tsunami Generation Due to Sea-Surface Pressure Change: Three-Dimensional Theory and Synthetics of Ocean-Bottom Pressure Change[J],2021,126(5).
APA	Saito T.,Kubota T.,Chikasada N.Y.,Tanaka Y.,&Sandanbata O..(2021).Meteorological Tsunami Generation Due to Sea-Surface Pressure Change: Three-Dimensional Theory and Synthetics of Ocean-Bottom Pressure Change.Journal of Geophysical Research: Oceans,126(5).
MLA	Saito T.,et al."Meteorological Tsunami Generation Due to Sea-Surface Pressure Change: Three-Dimensional Theory and Synthetics of Ocean-Bottom Pressure Change".Journal of Geophysical Research: Oceans 126.5(2021).