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|a Deep carbon export from a Southern Ocean iron-fertilized diatom bloom |h [electronic resource] |y English. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2012-07-19. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a 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. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15042598/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/04/25/98/00001/FI15042598_thm.jpg |