Next: 1.3 Outputs
Up: 1 Graphical interface
Previous: 1.1 Supported platforms
Contents
Subsections
A simulation is defined by:
- An initial state: initial values for
temperature, concentration, sea level and ice sheet extent;
- A duration: number of years of simulation;
- A simulation name and its color;
- Parameters determining the behavior of the model during the
simulation.
In the interface, the initial state can be chosen in the page following
the home page (figures 1,2).
The possible initial states are:
- Today's world: The temperature
is 15.3°C, the concentration is 405 ppm,
emissions are 8 GtC/year, the sea level is 0 m.
- The pre-industrial world: The
climatic variables are those of the pre-industrial era: the temperature
is 14.4 ° C, the concentration is 280 ppm,
the sea level of -0.2m , emissions are null.
- The final state of the previous simulation:
This allows to continue the previous simulation.
- The final state of a saved simulation:
If a final state of a simulation has already been saved, it is possible
to start a simulation with this state. This allows to continue an
earlier simulation.
The duration can be chosen in the same page as the initial state (figures
1,2). It can be between 100 years
and 10 million years. The deadline depends on the processes that
we wants to study. For example, to study current global warming, durations
of 100 to 500 years are recommended. To study the glacial-interglacial
variations in which the ice sheets are at play, durations of tens
to hundreds of thousands of years are recommended. To study continental
weathering, durations of several million years are recommended.
Figure 1:
Screenshot of the home page of SimClimat with Windows.
|
Figure 2:
Screenshot of the page where the intial state and the duration can
be chosen, with Windows.
|
In the interface, the color and name can be chosen in the second page
(figure 3). They can still be modified once the simulation
is launched using the ``curve'' icon (figure 5).
Figure 3:
Screenshot of the page where the simulation name and color can be
chosen, withWindows.
|
We can tune 3 kinds of parameters:
- Astronomical parameters (example in section 3.2.3):
- Earth-Sun Distance
- Solar power
- Eccentricity
- Obliquity
- Precession
- concentration or emissions: we can choose between
2 types of simulations:
- Set the concentration: The concentration is constant throughout
the simulation, whatever fluxes, and is chosen by the user
(example in section 3.2.1)..
- Set emissions: The concentration is calculated interactively by the
model, according to the sources or sinks chosen by the user. Sources
or sinks that the user can tune are:
- Anthropogenic emissions
- Volcanism and oceanic ridge activity
- Continental alteration
- Biological storage
- Climate feedbacks: Four types of climate feedback are taken into account
and can be optionally tuned or unplugged by the user:
- Albedo
- Ocean
- Vegetation
- Water vapor
For each parameter, we can show a small explanatory text and/or a
schematic (example: figure 4).
Once the simulation is launched, we can check the value of all parameters
using the ``eye'' icon, or modify parameters with the ``key''
icon (figure 7).
Figure 4:
Screenshot of the page where parameters associated with the carbon
cycle can be chosen, on Linux.
|
Next: 1.3 Outputs
Up: 1 Graphical interface
Previous: 1.1 Supported platforms
Contents
Camille RISI
2023-07-24