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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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Efficiency of carbon removal per added iron in ocean iron fertilization de Baar, H.J.W.; Gerringa, L.J.A.; Laan, P.; Timmermans, K.R. (2008). Efficiency of carbon removal per added iron in ocean iron fertilization. Mar. Ecol. Prog. Ser. 364: 269-282. http://dx.doi.org/10.3354/meps07548 In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 141452 [ download pdf ]

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Trefwoorden

Algae > Diatoms Analysis > Quantitative analysis Biological production > Primary production Chemical compounds > Carbon compounds > Atmospheric gases > Carbon dioxide Chemical elements > Metals > Transition elements > Heavy metals > Iron Chemical elements > Nonmetals > Carbon Efficiency Environments > Aquatic environment > Marine environment Fertilizers Quantitative analysis Quantitative analysis Sampling Transport processes Water bodies > Oceans Bacillariophyceae [WoRMS]; Bacillariophyceae [WoRMS] Marien/Kust

Author keywords

iron; fertilization; ocean; efficiency; carbon; export; diatoms

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Auteurs		Top
de Baar, H.J.W. Gerringa, L.J.A., meer Laan, P. Timmermans, K.R.

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Abstract

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 CO2 drawdown during the several weeks of artificial fertilization experiments with concomitant observations is in the range of 100 < (CO2: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)export < ~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)export < ~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)export < ~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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