| DOI: | 10.1002/2017JC013488
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| Scopus记录号: | 2-s2.0-85042221592
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| 论文题名: | Excitation Location and Seasonal Variation of Transoceanic Infragravity Waves Observed at an Absolute Pressure Gauge Array |
| 作者: | Tonegawa T.; Fukao Y.; Shiobara H.; Sugioka H.; Ito A.; Yamashita M.
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| 刊名: | Journal of Geophysical Research: Oceans
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| ISSN: | 21699275
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| 出版年: | 2018
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| 卷: | 123, 期:1 | | 起始页码: | 40
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| 结束页码: | 52
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| 语种: | 英语
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| 英文关键词: | absolute pressure gauge
; array analysis
; infragravity wave
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| Scopus关键词: | array
; deep water
; gauge
; gravity wave
; infrared radiation
; observational method
; seasonal variation
; shoreline
; spatiotemporal analysis
; wave dispersion
; Alaska
; Aleutian Islands
; Aogashima
; Chubu
; Honshu
; Izu Islands
; Japan
; North America
; Shizuoka [Chubu]
; South America
; United States
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| 英文摘要: | An array of 10 absolute pressure gauges (APGs) deployed in deep water 50 km east of Aogashima, an island in southern Japan, observed several isolated signals in the infragravity wave (IGW) frequency band (0.002–0.03 Hz) during boreal summer, whereas relatively high IGW energy persisted during boreal winter. The isolated IGW shows dispersion with a delay time of 4–5 days as a function of frequency. Here we estimate the excitation locations of IGWs for the two seasons with estimated incoming direction of IGW, calculation of transoceanic IGW trajectories and propagation times, and spatiotemporal variations of significant wave heights from WAVEWATCH III. In boreal summer, the isolated IGWs are primarily caused by IGW energies excited at the shoreline of South America, based on the following three observations: IGWs observed at the array originated from the east: the easterly ray path from the array reaches South America: and an event-like IGWs were observed at the array when a storm approaches eastward to the shoreline of South America, in which the observed delay time of 4–5 days was also supported by the frequency-dependent calculation of IGW propagation times. In boreal winter, the incessant IGWs consist of transoceanic IGW energies leaked from the shoreline, primarily from North America, and secondly from South America and the western Aleutian Islands. © 2017. American Geophysical Union. All Rights Reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/114876
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; The University of Tokyo, Tokyo, Japan; Kobe University, Kobe, Japan
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| Recommended Citation: | |
Tonegawa T.,Fukao Y.,Shiobara H.,et al. Excitation Location and Seasonal Variation of Transoceanic Infragravity Waves Observed at an Absolute Pressure Gauge Array[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(1)
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