Environmental Engineering Reference
In-Depth Information
calicoblastic
uid pH levels to prevent newly
produced skeleton from redissolving.
fl
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6.3.4 Coral Reefs: A Source or Sink
of Carbon?
Researchers have indicated the dominance of
inorganic carbon in the reef carbon sequestration
domain. This is consistent with the observation
that the calcium carbonate percentage in reef
sediments is close to 100 % (so inorganic carbon
percentage is close to 12 % by mass), while the
organic carbon percentage is typically
land snail shells:
implications for carbon
sources
and
radiocarbon
dating. Radiocarbon
830
Gosliner TM (1993) Biodiversity of tropical opistho-
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25:810
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0.5 %.
These proportions imply that inorganic carbon
accounts for about 95 % of carbon burial in reef
sediments. Thus, if the reef area is considered to
be 0.6
*
10
12
m
2
×
and the calcium carbonate
1,200 g m
−
2
year
−
1
, then the
contemporary accumulation on of calcium car-
bonate in coral reefs is
*
700 Tg year
−
1
. Based
on mass contribution of carbon to the molecular
weight of calcium carbonate (12/100), inorganic
carbon burial is about 80 Tg year
−
1
. Recalling
that calcium carbonate precipitation causes gas
evasion and applying the
burial
to be
*
177
Kawahata H, Yukino I, Suzuki A (2000) Terrestrial
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178
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habitat and carbonate production since the last glacial
maximum. Paleoceanography 12:533
-
for the ratio
of precipitated inorganic carbon to evaded car-
bon dioxide implies that coral reefs are a source
for approximately 50 Tg C year
−
1
. This is close
to the value of 43 Tg year
−
1
as observed in the
model estimate derived by Kleypas (
1997
).
'
0.6 rule
'
545
Knutzen J (1981) Effects of decreased pH on marine
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-
29
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Mitra A, Banerjee K, Sengupta K, Gangopadhyay A
(2009) Pulse of climate change in Indian Sundarbans:
a myth or reality? Nat Acad Sci Lett 32:1
-
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