Kelvin wave generation by a semi-infinite barrier

The linearized problem of Kelvin wave diffraction at the sharp edge of a thin semi-infinite barrier on a rotating earth is considered in the case when a discontinuity in depth stems from the edge in a direction parallel to the barrier. The solution in closed form is obtained using the Wiener-Hopf technique.It is shown that the direct effect of the depth discontinuity is always to divert additional energy away from the barrier, in the form of outgoing cylindrical waves if the period is small, and provided conditions are suitable as double Kelvin waves if the period is sufficiently long. Results suggest that Kelvin waves which are the most persistent in following an irregular coastline bounding a sea of abruptly varying depth are of intermediate period.

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Not just sea ice: other factors important to near‐inertial wave generation in the Arctic Ocean

Geophysical Research Letters ◽

10.1029/2020gl090508 ◽

2020 ◽

Author(s):

J. D. Guthrie ◽

J. H. Morison

Keyword(s):

Sea Ice ◽

Arctic Ocean ◽

Wave Generation ◽

The Arctic ◽

The Arctic Ocean ◽

Inertial Wave

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TEMPERATURE VARIABILITY AT SENUNU BAY, WEST SUMBAWA

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v5i2.7555 ◽

2013 ◽

Vol 5 (2) ◽

Author(s):

Syamsul Hidayat ◽

Mulia Purba ◽

Jorina Waworuntu

Keyword(s):

Layer Thickness ◽

Mixed Layer ◽

Cross Correlation ◽

Sea Surface ◽

Thermocline Depth ◽

Kelvin Wave ◽

The West ◽

Sea Bottom ◽

Annual Period ◽

Regional Processes

The purposes of this study were to determine the variability of temperature and its relation to regional processes in the Senunu Bay. The result showed clear vertical stratifications i.e., mixed layer thickness about 39-119 m with isotherm of 27°C, thermocline layer thickness about 83-204 m with isotherm of 14–26°C, and the deeper layer from the thermocline lower limit to the sea bottom with isotherm <13°C. Temperature and the thickness of each layers varied with season in which during the Northwest Monsoon the temperature was warmer and the mixed layer was thicker than those during Southeast Monsoon. During Southeast Monsoon, the thermocline layer rose about 24 m. The 2001, 2006, and 2009 (weak La Nina years), the Indonesia Throughflow (ITF) carried warmer water, deepening thermocline depth and reducing upwelling strength. In 2003 and 2008 thickening of mixed layer occurred in transition season was believed associated with the arrival of Kelvin Wave from the west. In 2002 and 2004 (weak El Nino period,) ITF carries colder water shallowing thermocline depth and enhancing upwelling strength. In 2007 was believed to be related with positive IODM where the sea surface temperature were decreasing due to intensification of southeast wind which induced strong upwelling. The temperature spectral density of mixed layer and thermocline was influenced by annual, semi-annual, intra-annual and inter-annual period fluctuations. The cross-correlation between wind and temperature showed significant value in the annual period. Keywords: temperature, thermocline, variability, ENSO, IODM.

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