[1] Nutrients are transferred from the nutricline into the winter mixed layer through a combination of vertical and lateral advection, referred to here as induction, the reverse of the subduction process. This advective supply of nutrients maintains the high productivity at high latitudes over timescales of several years and longer. Climatological diagnostics over the North Atlantic reveal that...

The climatology of the OPA/ARPEGE-T21 coupled general circulation model (GCM) is presented. The atmosphere GCM has a T21 spectral truncation and the ocean GCM has a 2°]1.5° average resolution. A 50year climatic simulation is performed using the OASIS coupler, without flux correction techniques. The mean state and seasonal cycle for the last 10 years of the experiment are described and compared ...

[1] Observations of silicic acid and nitrate along the lower branch of the global conveyor belt circulation show that silicic acid accumulation by diatom opal dissolution occurs at 6.4 times the rate of nitrate addition by organic matter remineralization. The export of opal and organic matter from the surface ocean occurs at a Si:N mole ratio that is much smaller than this almost everywhere (cf...

marine environment of the caspian sea, due to extensive human exploitation and discharge of large magnitudes of urban, industrial and agricultural waste, is under extensive pressure and human wastes threaten marine life and ecosystem of the sea. therefore, there is a substantial need for a good understanding of physical and chemical characteristics of the caspian waters. however, the data avail...

[1] The velocity and transport, with thermohaline properties, are determined from simultaneous moored time series within Mindoro, Tablas and Panay Straits that connect the South China Sea (SCS) and Sibuyan Sea to the Sulu Sea. These passages provide the only pathway for the SCS throughflow below thermocline depths and play a critical role in regulating the heat and freshwater balance within the...

Evidence suggests that the magnitude and frequency of the El Niño–Southern Oscillation (ENSO) changes on interdecadal time scales. This is manifest in a distinct shift in ENSO behavior during the late 1970s. This study investigates mechanisms that may force this interdecadal variability and, in particular, on modulations driven by extratropical Rossby waves. Results from oceanic shallow-water m...

Mesoscale currents, fronts, and eddies are ubiquitous and energetic features of ocean circulation. These phenomena, sometimes referred to as the ‘‘internal weather of the sea,’’ accommodate a diverse set of physical, chemical, and biological interactions that influence marine biogeochemistry on a wide range of timescales. These biogeochemical processes include the ‘‘biological pump,’’ i.e., the...

A high-resolution, off-line, ocean general circulation model, incorporating a realistic parameterisation of mixed layer convection is used to diagnose pathways and timescales of Southern Hemisphere Intermediate, Mode and thermocline water ventilation. Simulated and observed CFC-11 are in reasonably good agreement, demonstrating the model’s skill in representing realistic ventilation. Regional p...

We inferred the population densities of blue whales (Balaenoptera musculus) and short-beaked common dolphins (Delphinus delphis) in the Northeast Pacific Ocean as functions of the water-column's physical structure by implementing hierarchical models in a Bayesian framework. This approach allowed us to propagate the uncertainty of the field observations into the inference of species-habitat rela...

This paper investigates the internal tidal energy distribution in the southwestern Japan/East Sea using vertical round-trip travel time (τ) data from 23 pressure-sensor-equipped inverted echo sounders (PIESs). The τ records are analyzed by band-pass filtering to separate time-dependent variability of the semi-diurnal and diurnal bands. The semi-diurnal internal tides exhibit a horizontal beam p...