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|a Reconstruction of the history of anthropogenic CO2 concentrations in the ocean |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2009-11. |
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|a Nature Magazine Volume 462- Letters. |
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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 The release of fossil fuel CO2 to the atmosphere by human activity
has been implicated as the predominant cause of recent global
climate change1. The ocean plays a crucial role in mitigating the
effects of this perturbation to the climate system, sequestering 20
to 35 per cent of anthropogenic CO2 emissions2–4. Although much
progress has been made in recent years in understanding and
quantifying this sink, considerable uncertainties remain as to
the distribution of anthropogenic CO2 in the ocean, its rate of
uptake over the industrial era, and the relative roles of the ocean
and terrestrial biosphere in anthropogenic CO2 sequestration.
Here we address these questions by presenting an observationally
based reconstruction of the spatially resolved, time-dependent
history of anthropogenic carbon in the ocean over the industrial
era. Our approach is based on the recognition that the transport of
tracers in the ocean can be described by a Green’s function, which
we estimate from tracer data using a maximum entropy deconvolution
technique. Our results indicate that ocean uptake of anthropogenic
CO2 has increased sharply since the 1950s, with a small
decline in the rate of increase in the last few decades. We estimate
the inventory and uptake rate of anthropogenic CO2 in 2008 at
140625 Pg C and 2.360.6 Pg C yr21, respectively. We find that
the Southern Ocean is the primary conduit by which this CO2
enters the ocean (contributing over 40 per cent of the anthropogenic
CO2 inventory in the ocean in 2008). Our results also
suggest that the terrestrial biosphere was a source of CO2 until
the 1940s, subsequently turning into a sink. Taken over the entire
industrial period, and accounting for uncertainties, we estimate
that the terrestrial biosphere has been anywhere from neutral to a
net source ofCO2, contributing up to half as muchCO2 as has been
taken up by the ocean over the same period. |
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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/FI15052551/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/05/25/51/00001/FI15052551_thm.jpg |
