Carbon Cycle – Lecture 12B Earth’s atmospheric oxygen levels and redox reactions Slide 1 O2 in atmosphere: 60 x 103 moles/m2 Photosynthetic production of O2: 30 moles/ m2/yr Isotopic response time: 60 x 103/30 = 2 x 103 yr Reservoir response times: 10% imbalance: τ = 20 x 103 yr 1% imbalance: τ = 200 x 103 yr 0.1% imbalance: τ = 2000 x 103 yr, or 2 x 106 yr Slide 2 Oxygen Upper Limit: Spontaneous Combustion Oxygen Lower Limit: Deep Sea anaerobia Slide 3 p. W‐57 in Greenhouse Puzzles +'-#llt
?.
--
'ii;'h[fr
cott Hro r>a2a r.]
aR34rtcc
Wt
t
\-r
>L?.>
I .*2,
,*ett,o
t
'l ou*a'-
5
{
, vo-*ut|
-t
l--+(--rtr.4t-
+ouatl,@t
:?oJr+Ho
{
t{tobr oF
EaP nEA
er4
o*b+ov
J,
'*eo*co
'c'-,1
6e9-
' ^rr,.tuAu'
-
ont-t{i*oeao
I
^nri
o?l
ot
+
}
+ #-?,L"
^-I-_
4, fts+Zt$
-.og,lfutSot
Noo-
I o*+o-
fie*.*fu+t!*-
oas+o-
1
ilra+48r4
+E
S titllet'-
+HJ
.1.
t;5,in,;ffi!'o '*re*z
Erte*rp
Upw*rr&
Zotte3
gqq.
ja+'
cr( E€a
otaV tN ftte
NAE O€EP VNTiWS
gEvotDoFq I!
KEI ftlolePTT* ArOH tt8
fo,
arA
llrf'lOCCeDt
o)\tDtFtox €rATe aF attp1,
A0<f EAo*u
OXtOATtot'l ;-, ffi
eP tr'lftrr
( ccNstSAvAncN6.t Etee Til orrsl
0tnfrT AAvEz
,He7o8?N77tnst3 n/*v
CotvteQ,Jl Oxro,t
reD& \a
5/ uPt-E
ChRboN\)o(ro
lC *5r9oz
-,
.ht R)t(nt
f++Hto*ye.t
z'to
o
++ ix',l
A*r.A&s .0*aTEr2$,r
CtJg*O>+&r*Hg
do
\
47Ase'?,
trLEdRoN
J,
6lLhbtcE
OQGc ouT=o
StuPte
CARBont a5o/^F04 WaRL)
+{,
/NAs\q,
tvtorLSr,
--2
fuZ oFcq
o EzEQraat
Lo
-- )4.u,
2aZ aFJUL
qadta
++/h;.>oA6-?*4
fooToFH
I
EtSTArs
-2.. ioy-q
_>
Ht€3
+
7o 8;Attcr
EceefuoNs
/4So,
-COrl
Co>n
^
4t+'
>
crAt,
*Hto
'i'
85"
c
?
o
Uel
oJ:o,
Et-EcTRoNS
A.E
Slide 10 p. W‐51 in Greenhouse Puzzles Slide 11 p. W‐52 in Greenhouse Puzzles