L1 /
1
CH3041
ON-LINE LECTURE 28
GEOLOGICAL TRENDS
• During the past 3000
years the temperature
has been within 1oC of its
present value.
years the temperature
has been within 1oC of its
present value.
• To date the
increase
since pre-industrial times
has been about 0.5oC.
since pre-industrial times
has been about 0.5oC.
• A doubling of [CO2] (270ppm)
is predicted to increase the
T by 1.6oC.
is predicted to increase the
T by 1.6oC.
• The first thing a
model
must do is reproduce the
past data.
must do is reproduce the
past data.
15.3
15.0
14.7
14.4
14.1
oC
YEAR
oC
YEAR
1880 1980
Holocene
Pleistocene
10kA
1.6MA
