Oceanography SeminarSeptember 5, 3:00pm - 4:15pm
Mānoa Campus, MSB 100
Department of Oceanography
"Dissolved Al during the N Atlantic US GEOTRACES cruises; subsurface surprises and how a little data can ruin a theory"
Abstract: The 2010 and 2011 US GEOTRACES cruises provided an opportunity to produce a highly detailed full depth section of the concentrations of dissolved Al across the N Atlantic between 22 and 70ËšW and 17-37ËšN, providing an opportunity to produce a semi-synoptic section across the basins of the N Atlantic.
Along this transect, surface water dissolved Al concentrations, reflect the deposition and partial dissolution of aluminosilicate mineral dust into the surface ocean. The subsequent inclusion of this signal into the seasonally formed, classical, 18Ëš sub-tropical mode water indicates the susceptibility of the upper ocean to imprinting by atmospherically borne materials. Similarly in the eastern basin, the Mediterranean outflow water at ~ 1300m is clearly delineated by its elevated Al signal again a result of the intense deposition of eolian materials to the surface waters of the Mediterranean. The biggest surprise though is an entirely different source of dissolved Al which is seen entering the deeper waters of the Atlantic at the station occupied in the axial valley of the Mid Atlantic Ridge (MAR) near the TAG hydrothermal site. Here, elevated dissolved Al values of over 40 nM, are seen in the buoyant hydrothermal plume and the effect of this input is visible in the elevated deep water concentrations of the nearby stations. This previously unrecognised input has important consequences for recently resurrected theories of Al cycling in the ocean.
Oceanography, Mānoa Campus
Thursday, September 5
Mathematics Final OralMānoa Campus, Kuykendall 101
Central Banking in CanadaMānoa Campus, Saunders Hall 515
Robert Dean Frisbie, a Writer of the South Seas and His Contribution to PacificMānoa Campus, Henke Hall 325
Hawaii Food Policy Council Think Tank Brown BagMānoa Campus, Saunders 617 (Futures Room)
Resume & Cover Letter: Market Yourself on PaperMānoa Campus, QLCSS 212
Oceanography SeminarMānoa Campus, MSB 100
Water: A valuable and irreplaceable source for the islandsMānoa Campus, POST 126