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Lecture 11

ZOL 355 Lecture 11: Atmospheric CO2 and the Carbon Cycle
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6 Pages
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Spring 2018

Department
Zoology
Course Code
ZOL 355
Professor
P.Ostrom
Lecture
11

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Atmospheric CO2 and the Carbon Cycle
Temporal variation in atmospheric CO2 and its significance
o Atmospheric CO2 over the past 0.5 million years
o Annual temperature anomaly: 1884 to 2014
Annual temperature anomaly since 1884
(anomaly = computed relative to average
of period (1951-2014)
o CO2 icrease is less tha expected: the issue of issig CO2
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Oceans as a sink for CO2
o Reservoir - an area that contains something
Ocean, lakes and ice sheets are a reservoir for water
A reservoir for CO2 is where it is accumulating faster than it is
reoed aro sik
o Forms of carbon that derive from CO2
CO2 gets transformed into biomass and back into CO2
The carbon that was a leaf goes into bacteria and gets made into
biomass
Organic carbon
When carbon is or was biomass
o Phytoplankton, leaves, tree trunk, pine needles, dead leaves
o Dead leaves will degrade and go into soil
Inorganic carbon
If it is a gas or solid or dissolved form that does’t hae DNA i
it then it is inorganic
Solid form
o Shell of a clam
o Phytoplankton makes a shell (tests)
Dissolved form
o HCO3- (bicarbonate)
o If it is a gas or solid or dissoled for that does’t hae DNA
in it then it is inorganic
Gases
o CO2
o CH4 (methane)
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Description
Atmospheric CO and the2Carbon Cycle Temporal variation in atmospheric CO and 2ts significance o Atmospheric CO2 over the past 0.5 million years o Annual temperature anomaly: 1884 to 2014 Annual temperature anomaly since 1884 (anomaly = computed relative to average of period (19512014) o CO 2ncrease is less than expected: the issue of missing CO 2
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