Biogeochemical iron budgets of the Southern Ocean south of Australia : decoupling of iron and nutrient cycles in the subantarctic zone by the summertime supply
Figure S2: Trace metal stations sampled during SAZ-Sense, numbered according to the nearest CTD cast. (1.091Mb)
Figure S3: Vertical profiles of particulate trace metals (iron, aluminum, and manganese) and hydrography (temperature, salinity, and dissolved oxygen) at station 23 (CTD 105) located at 150.2°E, 44.2°S, on the northeast transect from P3 to Hobart. (756.0Kb)
Figure S4: Active fires in Tasmania on the 18 February 2007 detected from MODIS Terra and Aqua satellite sensors and UV Aerosol Index (AI) from the OMI instrument on the same day, indicating an important smoke plume when sampling AeroSAZ-8. (829.7Kb)
Table S1: Aluminum, iron and dust concentrations in aerosols and solubility of atmospheric iron in seawater in the collected aerosols. (523bytes)
Table S2: Estimated dust, total iron, and dissolved iron flux estimations for each of the three process stations P1, P2 and P3. (624bytes)
Bowie, Andrew R.
Remenyi, Tomas A.
Lam, Phoebe J.
Boyd, Philip W.
Townsend, Ashley T.
Trull, Thomas W.
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Climate change is projected to significantly alter the delivery (stratification, boundary currents, aridification of landmasses, glacial melt) of iron to the Southern Ocean. We report the most comprehensive suite of biogeochemical iron budgets to date for three contrasting sites in subantarctic and polar frontal waters south of Australia. Distinct regional environments were responsible for differences in the mode and strength of iron supply mechanisms, with higher iron stocks and fluxes observed in surface northern subantarctic waters, where atmospheric iron fluxes were greater. Subsurface waters southeast of Tasmania were also enriched with particulate iron, manganese and aluminum, indicative of a strong advective source from shelf sediments. Subantarctic phytoplankton blooms are thus driven by both seasonal iron supply from southward advection of subtropical waters and by wind-blown dust deposition, resulting in a strong decoupling of iron and nutrient cycles. We discuss the broader global significance our iron budgets for other ocean regions sensitive to climate-driven changes in iron supply.
Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 23 (2009): GB4034, doi:10.1029/2009GB003500.
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