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SimClimat has a much simpler physical content than the climate models
participating in CMIP (table 2),
which allows it to be much faster. It represents the atmosphere in
a much coarser way (0D instead of 3D), but couples more components,
notably the ice sheets and the carbon cycle. To this extent, it is
rather analogous to a model Earth system
(figure 15, purple frame). This allows
SimClimat to represent climate changes at geological time scales.
Table 2:
Table identifying the main differences between climate models participating
in CMIP and SimClimat's physical model.
Models
|
Climate model participating in CMIP
|
SimClimat
|
Atmospheric grid dimension
|
3D
|
0D
|
Atmospheric and oceanic dynamics
|
yes
|
no
|
Time steps
|
a few seconds or minutes
|
several years
|
Radiation and Earth radiative balance
|
yes
|
very simple
|
Cloud effects
|
yes
|
no
|
Carbon cycle
|
no
|
yes
|
Ice sheets
|
no
|
yes
|
Uncertainty estimate
|
iner-model spread
|
no
|
Computational time for 100 years
|
several days
|
less than a second
|
|
Camille RISI
2023-07-24