NetLogo User Community Models
by Lisa Boehm, Petra Hutner (Submitted: 02/09/2010)
WHAT IS IT?
This model is a simulation which should give a general idea about how the thermohaline circulation (THC) works.
HOW IT WORKS
After starting the simulation, the red water-molecules begin to move. In the model, the density of the water is only depending on the water temperature, reflected in the different shades of red.
While running the program, the water-particles behave on behalf of their temperature. Reaching a specific water-temperature and probability, molecules evaporate and create a cloud at the top of the scene. If there are enough water drops, it rains down and so the water joins the circulation again.
HOW TO USE IT
First, the user can chose to make use of different sliders to affect the model:
The user has also the opportunity to select one out of four scenarios in the drop-down menu called “global-change”. The numbers to choose represent the average temperature change on earth.
With the setup-button the initial situation is set up.
THINGS TO NOTICE
The simulation stops if an extreme situation occurs.
EXTENDING THE MODEL
As an extension to this model you could add the variable “salinity” to both turtles and patches. The water density should then be calculated out of “temperature” and “salinity”, which will make the model more accurate.
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