{"refrec":{"BRefID":127845,"RR":"<b>de Baar, H.J.W.; Gerringa, L.J.A.; Laan, P.; Timmermans, K.R.</b> (2008). Efficiency of carbon removal per added iron in ocean iron fertilization. <i>Mar. Ecol. Prog. Ser. 364</i>: 269-282. <a href=\"http://dx.doi.org/10.3354/meps07548\" target=\"_blank\">http://dx.doi.org/10.3354/meps07548</a>","BEntID":121932,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 364</i>: 269-282. <a href=\"https://dx.doi.org/10.3354/meps07548\" target=\"_blank\">https://dx.doi.org/10.3354/meps07548</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"de Baar, H.J.W.; Gerringa, L.J.A.; Laan, P.; Timmermans, K.R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"de Baar, H.J.W. <i>et al.</i>","Englishabstract":"The major response to ocean iron fertilization is by large diatoms, which at Fe-replete ambient seawater show an optimum C:Fe elemental ratio of ~23 000 and a higher ratio of ?-160 000 or more under Fe-limited conditions. The efficiency of CO<sub>2</sub> drawdown during the several weeks of artificial fertilization experiments with concomitant observations is in the range of 100 < (CO<sub>2</sub>:Fe) < 1000 and is unknown in direction (positive or negative) and magnitude in the period after observations. The efficiency of biogenic carbon export into deeper water layers ranges from ~650 < (C:Fe)<sub>export</sub> < ~25 000 for reported export depths in the 100 to 250 m range. Variations in ocean initial conditions and variable weather during an experiment cause this range of ~2 orders of magnitude. Approximately 75% of Fe added in fertilization experiments is lost very rapidly. Hence the above efficiencies can be multiplied 4-fold, to ~2600 < (C:Fe)<sub>export</sub> < ~100 000, for the sake of comparison with natural fertilization with Fe-organic complexes, which stabilize Fe in solution. Quantification of the Fe source of natural fertilization is difficult, leading to an export efficiency in ~2400 < (C:Fe)<sub>export</sub> < ~800 000 range. Due to severe under-sampling, the existing datasets of artificial experiments and natural fertilizations may allow a wider range of alternative assessments than reported here. 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