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Rainfall Effect On Sediment And Nutrient Fluxes In A Small Mangrove River, Okinawa, Japan, Kazumi Terada, Yukio Koibuchi, Masahiko Isobe
Rainfall Effect On Sediment And Nutrient Fluxes In A Small Mangrove River, Okinawa, Japan, Kazumi Terada, Yukio Koibuchi, Masahiko Isobe
Journal of Marine Research
To understand the effect of rainfall on sediment and nutrient fluxes in a mangrove river ecosystem, field observations were conducted in the Fukido River, Okinawa, Japan. Water currents and water quality parameters (salinity and turbidity) were measured at the river mouth and upstream, and surface water samples were analyzed for nutrient concentrations (NO3-N, NH4-N, PO4-P, SiO2-Si, suspended solids [SS], total nitrogen [TN], and total phosphorus [TP]). Observations were conducted on both clear and rainy days, which revealed the effect of weather. SS flux at the river mouth (outflux to sea) and upstream …
Cold-Seep Benthic Communities In The Japan Subduction Zones: Geological Control Of Community Development, Myriam Sibuet, S. Kim Juniper, Guy Pautot
Cold-Seep Benthic Communities In The Japan Subduction Zones: Geological Control Of Community Development, Myriam Sibuet, S. Kim Juniper, Guy Pautot
Journal of Marine Research
A large number of Calyptogena-dominated benthic communities, apparently chemosynthetically-based, were discovered at methane-rich pore-water seeps in the Japan subduction zones (3850–6000 m depth). Photographic and video surveys from four submersible dives were analyzed to study the influence of faulting, topography and substratum on exploitation of cold seeps by megafauna. Pore-water seepage occurred in a variety of geological settings, including subduction-erosion and accretionary prism formation, always in association with major faults which likely facilitated upward migration of fluids from a deep high-pressure zone. Sediment cover and manganese crusts on the seafloor appeared to block pore-water discharge, except where interrupted by …
Tide Gauge Response To Tsunamis: Measurements At 40 Tide Gauge Stations In Japan, Kenji Satake, Masami Okada, Kuniaki Abe
Tide Gauge Response To Tsunamis: Measurements At 40 Tide Gauge Stations In Japan, Kenji Satake, Masami Okada, Kuniaki Abe
Journal of Marine Research
The responses of tide gauges to tsunamis are examined by in situ measurements at 40 stations in northeastern Japan. Recovery of water level in the tide well is measured after the water is drained or added to create a water level difference between the inside and outside of the wells. The recovery times for a 1 m water level difference, estimated from the observations, vary from station to station and range from 65 to 1300 sec. Tsunami waveforms on tide gauge records from the 1983 Japan Sea earthquake are corrected for the observed response. For those stations with the observed …
Energetics Of The Kuroshio South Of Japan, David Szabo, Georges L. Weatherly
Energetics Of The Kuroshio South Of Japan, David Szabo, Georges L. Weatherly
Journal of Marine Research
Historical GEK data are used to estimate the flow of energy from the mean current to the fluctuations for the surface of the Kuroshio in a region south of Japan. The horizontal transfer components of kinetic energy and temperature variance are calculated and are found to be similar to estimates for the Florida Current....