Mechanism for export of sediment-derived iron in an upwelling regime
Figure S1: Density initialization for the model taken from data collected off the coast of Newport, Oregon in August, 2009 using a CTD cast. (98.68Kb)
Siedlecki, Samantha A.
Archer, D. E.
MetadataShow full item record
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.
Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 39 (2012): L03601, doi:10.1029/2011GL050366.
Showing items related by title, author, creator and subject.
Coastal ocean processes : wind-driven transport processes on the U.S. west coast : Portland, Oregon, Workshop July 14-16, 1993 Smith, R. L.; Brink, Kenneth H. (Woods Hole Oceanographic Institution, 1994-09)Wind-driven transport occurs on nearly all of the world's continental shelves. A workshop, open to all interested scientists, was held in Portland, Oregon, on July 14-16, 1993, to assess the need for a major interdisciplinary ...
Katzman, Rafael (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-12)A new tomographic technique is employed to investigate the structure and dynamics of the Pacific upper mantle. We invert band-center travel times of ScS reverberations and frequency-dependent travel times of direct S ...
Dell, Rebecca Walsh (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-02)Physical oceanographers have known for several decades the total amount of abyssal mixing and upwelling required to balance the deep-water formation, but are still working to understand the mechanisms and locations—how ...