122
o
Ql
E
::l
o
>
Ql
2
o
o
Figure 4.
Global Atmospheric Evolution: Impact of Anthropogenic Activities
Thousands of years before present.
200
400
600
800
200
400
600
800
Thousands of years before present.
The model estimates time ice volume variations which are in good agreement
with those recorded by 0 18 0 measured in sediments.
+ [E - cr«(1 - a)TZ-I - ~)4] * [RjR2RaOCIC2 + (RI + R2)(Cj + C2) + Rao(R]C] +
R2C2) + RI + R2 + Rao]
+ [EZ-] - cr«(1-a)TZ-2 - ~)4] * [2RIR2RaoCIC2 + (R] + R2)(C) + C2) + Rao(RIC)
+ R2C2)]
+ [EZ-2 - cr«(I-a)TZ-3 - ~)4] * [2R)R2RaoC IC2]
C2 + CI
C) C2
1
I
1
Qa (CI C 2 + Roo + R2 + R) + RIR2 + R)Rao + R2Rao)
I
C2+ C I CI C2
RI+R2+RGO C2
= CITa Z - (2CI C 2 + Roo + R2 + Ri) + CI TaZ- 2 + CjT( RjR2Rao + RI)
-I C2
R2 + RGO
1
+ CjTZ (Rj) - TI (Rj R 2 R ao) - T2(R2Rao)