Synthesis of iron fertilization experiments : from the Iron Age in the Age of Enlightenment Baar, Hein J. W. de Boyd, Philip W. Coale, Kenneth H. Landry, Michael R. Tsuda, Atsushi Assmy, Philipp Bakker, Dorothee C. E. Bozec, Yann Barber, Richard T. Brzezinski, Mark A. Buesseler, Ken O. Boye, Marie Croot, Peter L. Gervais, Frank Gorbunov, Maxim Y. Harrison, Paul J. Hiscock, William T. Laan, Patrick Lancelot, Christiane Law, Cliff S. Levasseur, Maurice Marchetti, Adrian Millero, Frank J. Nishioka, Jun Nojiri, Yukihiro van Oijen, Tim Riebesell, Ulf Rijkenberg, Micha J. A. Saito, Hiroaki Takeda, Shigenobu Timmermans, Klaas R. Veldhuis, Marcel J. W. Waite, Anya M. Wong, Chi-Shing 2010-05-27T13:25:09Z 2010-05-27T13:25:09Z 2005-09-28
dc.description Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 110 (2005): C09S16, doi:10.1029/2004JC002601. en_US
dc.description.abstract Comparison of eight iron experiments shows that maximum Chl a, the maximum DIC removal, and the overall DIC/Fe efficiency all scale inversely with depth of the wind mixed layer (WML) defining the light environment. Moreover, lateral patch dilution, sea surface irradiance, temperature, and grazing play additional roles. The Southern Ocean experiments were most influenced by very deep WMLs. In contrast, light conditions were most favorable during SEEDS and SERIES as well as during IronEx-2. The two extreme experiments, EisenEx and SEEDS, can be linked via EisenEx bottle incubations with shallower simulated WML depth. Large diatoms always benefit the most from Fe addition, where a remarkably small group of thriving diatom species is dominated by universal response of Pseudo-nitzschia spp. Significant response of these moderate (10–30 μm), medium (30–60 μm), and large (>60 μm) diatoms is consistent with growth physiology determined for single species in natural seawater. The minimum level of “dissolved” Fe (filtrate < 0.2 μm) maintained during an experiment determines the dominant diatom size class. However, this is further complicated by continuous transfer of original truly dissolved reduced Fe(II) into the colloidal pool, which may constitute some 75% of the “dissolved” pool. Depth integration of carbon inventory changes partly compensates the adverse effects of a deep WML due to its greater integration depths, decreasing the differences in responses between the eight experiments. About half of depth-integrated overall primary productivity is reflected in a decrease of DIC. The overall C/Fe efficiency of DIC uptake is DIC/Fe ∼ 5600 for all eight experiments. The increase of particulate organic carbon is about a quarter of the primary production, suggesting food web losses for the other three quarters. Replenishment of DIC by air/sea exchange tends to be a minor few percent of primary CO2 fixation but will continue well after observations have stopped. Export of carbon into deeper waters is difficult to assess and is until now firmly proven and quite modest in only two experiments. en_US
dc.description.sponsorship This research was supported by the European Union through programs CARUSO (1998– 2001), IRONAGES (1999 –2003), and COMET (2000–2003); the Netherlands- Bremen Oceanography program NEBROC-1; and the Netherlands Organization for Research NWO through the Netherlands Antarctic Program project FePath. Both the U.S. National Science Foundation and the U.S. Department of Energy provided significant support for the SOFeX program. M.R.L. acknowledges the U.S. National Science Foundation for support of IronEx and SOFeX projects and related studies (OCE-9912230, -9911765, and -0322074). en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research 110 (2005): C09S16 en_US
dc.identifier.doi 10.1029/2004JC002601
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.subject Iron en_US
dc.subject Fertilization en_US
dc.subject Phytoplankton en_US
dc.title Synthesis of iron fertilization experiments : from the Iron Age in the Age of Enlightenment en_US
dc.type Article en_US
dspace.entity.type Publication
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