Deep carbon export from a Southern Ocean iron-fertilized diatom bloom

Smetacek, Victor, Klaas, Christine, Strass, Volker H., Assmy, Philipp, Montresor, Marina, Cisewski, Boris, Savoye, Nicolas, Webb, Adrian, d’Ovidio, Francesco, Arrieta, Jesús M., Bathmann, Ulrich, Bellerby, Richard, Berg, Gry Mine, Croot, Peter, Gonzalez, Santiago, Henjes, Joachim, Herndl, Gerhard J., Hoffmann, Linn J., Leach, Harry, Losch, Martin, Mills, Matthew M., Neill, Craig, Peeken, Ilka, Röttgers, Rüdiger, Sachs, Oliver, Sauter, Eberhard, Schmidt, Maike M., Schwarz, Jill, Terbrüggen, Anja and Wolf-Gladrow, Dieter (2012) Deep carbon export from a Southern Ocean iron-fertilized diatom bloom Nature, 487 (7407). pp. 313-319. DOI 10.1038/nature11229.

[img] Text
nature11229.pdf - Published Version
Restricted to Registered users only

Download (1077Kb) | Contact
[img] Text
nature11229-s1.pdf - Supplemental Material
Restricted to Registered users only

Download (13Mb) | Contact
[img] Text
nature11229-s2.pdf - Supplemental Material
Restricted to Registered users only

Download (19Mb) | Contact

Supplementary data:

Abstract

Fertilization of the ocean by adding iron compounds has induced diatom-dominated phytoplankton blooms accompanied by considerable carbon dioxide drawdown in the ocean surface layer. However, because the fate of bloom biomass could not be adequately resolved in these experiments, the timescales of carbon sequestration from the atmosphere are uncertain. Here we report the results of a five-week experiment carried out in the closed core of a vertically coherent, mesoscale eddy of the Antarctic Circumpolar Current, during which we tracked sinking particles from the surface to the deep-sea floor. A large diatom bloom peaked in the fourth week after fertilization. This was followed by mass mortality of several diatom species that formed rapidly sinking, mucilaginous aggregates of entangled cells and chains. Taken together, multiple lines of evidence—although each with important uncertainties—lead us to conclude that at least half the bloom biomass sank far below a depth of 1,000 metres and that a substantial portion is likely to have reached the sea floor. Thus, iron-fertilized diatom blooms may sequester carbon for timescales of centuries in ocean bottom water and for longer in the sediments.

Document Type: Article
Keywords: Marine chemistry; Earth sciences; Environmental science; Ecology
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
AWI
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
DOI etc.: 10.1038/nature11229
ISSN: 0028-0836
Projects: Future Ocean
Date Deposited: 19 Jul 2012 10:15
Last Modified: 01 Mar 2017 13:21
URI: http://eprints.uni-kiel.de/id/eprint/14868

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...