How islands stir and fertilize the upper ocean

Details How islands stir and fertilize the upper ocean How islands stir and fertilize the upper ocean

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116303h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 16, CiteID L16303

Mathematics

Logic

4

Oceanography: General: Upwelling And Convergences, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes, Oceanography: Physical: Western Boundary Currents, Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling, Information Related To Geographic Region: Pacific Ocean

Scientific paper

Large differences between the upstream and lee side flow characteristics of an isolated island in the Kuroshio have been identified from a three-dimensional velocity survey and from vertical profiles of fine- and micro-structure. In the island wake, the relative vorticity is O(10f), the horizontal current divergence indicates upwelling of O(0.01 m s-1), and the rate of dissipation of kinetic energy is O(10-4 W kg-1). Isopycnal surfaces shoal by 60 m on the lee side and surface nitrate concentration increases seven-fold. Flow blockage by the island and the Izu-Ogasawara Ridge on its flanks, induces horizontal and vertical flow separation. The associated lateral and vertical shear drive the upwelling and the vertical mixing in the wake and produces a very pronounced ``island mass effect.''

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