Synthesis of iron fertilization experiments: From the Iron Age in the Age of Enlightenment

作者：H. J. W. de Baar, Philip W. Boyd, Kenneth H. Coale, Michael R. Landry, Atsushi Tsuda, Philipp Assmy, Dorothée C. E. Bakker, Yann Bozec, Richard T. Barber, Mark A. Brzezinski, Ken O. Buesseler, Marie Boyé, Peter Croot, Frank Gervais, Maxim Y. Gorbunov, Paul J. Harrison, William T. Hiscock, Patrick Laan, Christiane Lancelot, Cliff S. Law, Maurice Levasseur, Adrian Marchetti, Frank J. Millero, Jun Nishioka, Yukihiro Nojiri, Tim van Oijen, Ulf Riebesell, Micha J.A. Rijkenberg, Hiroaki Saito, Shigenobu Takeda, Klaas R. Timmermans, Marcel J.W. Veldhuis, Anya M. Waite, C. S. Wong · 发表于：Journal of Geophysical Research Atmospheres · 年份：2005 · DOI：10.1029/2004jc002601 · 被引用次数：989 · 研究领域：Marine and coastal ecosystems、Aquatic Ecosystems and Phytoplankton Dynamics、Marine Biology and Ecology Research

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 experime...