Mathematics – Logic
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3903601s&link_type=abstract
Geophysical Research Letters, Volume 39, Issue 3, CiteID L03601
Mathematics
Logic
Oceanography: General: Benthic Boundary Layers, Oceanography: General: Continental Shelf And Slope Processes (3002), Oceanography: General: Upwelling And Convergences (4964), Oceanography: Physical: Eastern Boundary Currents, Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912)
Scientific paper
Model simulations performed with a three-dimensional, high-resolution, process study ocean model of eastern boundary upwelling systems are used to describe a mechanism that efficiently transports sediment-derived dissolved iron offshore in the subsurface through the bottom boundary layer (BBL) during downwelling-favorable wind events. In the model, sediment-derived iron accumulates in the BBL on the outer shelf when the winds are upwelling-favorable. When the wind reverses, the iron-laden BBL is mixed into the water column and transported offshore along isopycnals that intersect the bottom. Depending on the frequency of wind reversal, between 10-50% of the shelf sediment-derived iron flux is exported offshore through this previously unidentified subsurface pathway. If this mechanism operates on all coastal upwelling regimes, the global export of sediment-derived iron to the open ocean would be equivalent to ten times larger than the estimated source of dissolved iron from aerosols.
Archer D. E.
Mahadevan Amala
Siedlecki S. A.
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