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Observations of infragravity waves at the Monterey ocean bottom broadband station (MOBB)

2005; Wiley; Volume: 6; Issue: 9 Linguagem: Inglês

10.1029/2005gc000988

1525-2027

D. Dolenc, Barbara Romanowicz, Debra S. Stakes, Paul McGill, D. S. Neuhauser,

Ocean Waves and Remote Sensing

Infragravity waves can be observed at the 1000 m deep ocean bottom broadband seismic station MOBB on stormy as well as quiet days. When compared to the energy of the short‐period ocean waves recorded at the local buoys, infragravity waves in the longer than 20 s period band are found to be mainly locally generated from shorter‐period waves. Two types of modulation of the infragravity signal are observed. First, the entire infragravity band signal is modulated in‐phase with tides, possibly as a result of the nonlinear exchange of energy between the short‐period waves and tidal currents. Second, a longer‐period modulation of the infragravity signal is observed and is best correlated with the energy of the 14 s period ocean waves. This correlation indicates that the mechanism of generation of double frequency microseisms and infragravity waves are likely strongly related. Previously recorded data during the Oregon ULF/VLF experiment at 600 m water depth also indicate that infragravity waves are primarily locally generated.