Show simple item record

dc.contributor.authorBuesseler, Ken O.  Concept link
dc.contributor.authorAndrews, J. E.  Concept link
dc.contributor.authorPike, Steven M.  Concept link
dc.contributor.authorCharette, Matthew A.  Concept link
dc.contributor.authorGoldson, Laura E.  Concept link
dc.contributor.authorBrzezinski, Mark A.  Concept link
dc.contributor.authorLance, V. P.  Concept link
dc.date.accessioned2006-04-28T19:27:26Z
dc.date.available2006-04-28T19:27:26Z
dc.date.issued2004-07-26
dc.identifier.urihttps://hdl.handle.net/1912/908
dc.descriptionAuthor Posting. © The Authors, 2004. This is the author's version of the work. It is posted here by permission of American Society of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography 50 (2005): 311-327, doi:10.4319/lo.2005.50.1.0311.en
dc.description.abstractWe studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4 week Fe enrichment experiment conducted in the high-silicate high-nitrate waters just south of the Southern Antarctic Circumpolar Current Front at 172.5°W. Decreases in 234Th activity with time in the fertilized mixed layer (0-50m) exceeded those in unfertilized waters, indicating enhanced export of 234Th on sinking particles after Fe enrichment. The addition of Fe also affected export below the fertilized patch by increasing the efficiency of particle export through the 100 m depth horizon. Extensive temporal and vertical Lagrangian sampling allowed us to make a detailed examination of the 234Th flux model, which was used to quantify the fluxes of particulate organic carbon (POC) and biogenic silica (bSiO2). Iron addition increased the flux of both POC and bSiO2 out of the mixed layer by about 300%. The flux at 100 m increased by more than 700% and 600% for POC and bSiO2, respectively. The absolute magnitude of the POC and bSiO2 fluxes were not large relative to natural blooms at these latitudes, or to those found in association with the termination of blooms in other ocean regions. Our results support the hypothesis that Fe addition leads directly to significant particle export and sequestration of C in the deep ocean. This is a key link between ocean Fe inputs and past changes in atmospheric CO2 and climate.en
dc.description.sponsorshipThis work was supported by the Division of Ocean Sciences at the U.S. National Science Foundation, the Biological and Environmental Research Office, Office of Science, U.S. Department of Energy, and for RIB Polar Star logistical support, Polar Programs at the U.S. National Science Foundation.en
dc.format.extent1612288 bytes
dc.format.extent1558016 bytes
dc.format.mimetypeapplication/msword
dc.format.mimetypeapplication/msword
dc.language.isoen_USen
dc.relation.urihttps://doi.org/10.4319/lo.2005.50.1.0311
dc.titleParticle export during the Southern Ocean Iron Experiment (SOFeX)en
dc.typePreprinten


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record