Calculations are presented of the rate of energy conversion of the barotropic tide into internal gravity waves above topography on the ocean floor. The ocean is treated as infinitely deep, and the topography consists of periodic obstructions; a Green function method is used to construct the scattered wavefield. The calculations extend the previous results of Balmforth et al. for subcritical top...

When the ocean seabed is considered to be rigid, the ideal waveguide model can be used to model the shallow water environment. However, a more realistic ocean waveguide model treats the ocean floor as a boundary between two different fluid media. In this paper, a frequency-domain characterization of shallow water environments is proposed based on this realistic waveguide model with a fluid boun...

Sagami Bay is an active tectonic area in Japan. In 1993, a real-time deep sea floor observatory was deployed at 1,175 m depth about 7 km off Hatsushima Island, Sagami Bay to monitor seismic activities and other geophysical phenomena. Video cameras monitored biological activities associated with tectonic activities. The observation system was renovated completely in 2000. An ocean bottom electro...

Introduction: The possible existence of an ocean beneath the surface of Jupiter’s icy moon Europa has fueled scientific interest in this tiny world. Liquid water is a crucial element in the development of life on Earth, and if present on Europa, increases the likelihood of finding life there as well. Hydrothermal vents on the Europan ocean floor could provide habitat for microbes as well as gen...

Deep Sea Drilling results in the Indian Ocean and mapping of Mesozoic magnetic anomalies allow construction of a model for the plate system in the early Indian Ocean. In spite of the fact that the concept of Gondwanaland, the late Paleozoic supercontinent of the Southern Hemisphere, has been extant for over 50 years (Wegener, 1929; DuToit, 1937), the details of the exact configuration of its co...

[1] Estimates of the dissipation of subinertial currents due to bottom boundary layer drag at the eastern and western boundaries of the North Atlantic ocean, between 15 N and 60 N, are computed using data from the world’s largest archive of ocean current meter time series. We show from these data that a significant proportion of such loss in this region is due to dissipation at the western boun...

During the past decades, Ocean Bottom Seismometers (OBS) have played a key role in permanent seismic activity monitoring at sea as well as allowing a better understating of the earth interior. Data collected by the instrument can provide information on the ocean bottom sub-layers down to a depth of 40 km beneath the ocean floor. The accuracy of the results directly depends on the temperature st...

This paper introduces a function of correlation between two hydrophones, basing on the Kuperman-Ingenito ocean ambient noise model. There is a similarity in form between the cross correlation function and the transfer function in ocean waveguide from a point source to a receiver. Thus, the noise cross correlation function between two hydrophones in vertical location can extract actual transfer ...

Around 8,200 years ago, a 180-mile-wide section of the ocean floor off the coast of Norway reached a tipping point. Several thousand years prior, ice streams from melting glaciers had been carrying trillions of tons of sediment to the ocean. Over time, the sediment had accumulated at the edge of the continental shelf, where the shallower ocean floor around Scandinavia plunges toward the depths ...

When pelagic organisms die and fall onto the deep-sea floor they create food falls, i.e., parcels of organic enrichment that subsidize deep benthic scavenging communities. The diversity quantities falls remain unstudied for many ocean regions since are stochastically deposited rapidly scavenged. Southern Ocean habitat supports large populations megafauna but few have been documented. To investi...