State change behaviors

State change behaviors act on the basic properties of the virtual plot being modeled.

• Precipitation Change - B "B" in the function for varying precipitation through time. Used by the Precipitation Climate Change behavior.
• Precipitation Change - C "C" in the function for varying precipitation through time. Used by the Precipitation Climate Change behavior.
• Precipitation Change - Precip Lower Bound The lower bound for allowed precipitation values. Used by the Precipitation Climate Change behavior.
• Precipitation Change - Precip Upper Bound The upper bound for allowed precipitation values. Used by the Precipitation Climate Change behavior.
• Temperature Change - B "B" in the function for varying temperature through time. Used by the Temperature Climate Change behavior.
• Temperature Change - C "C" in the function for varying temperature through time. Used by the Temperature Climate Change behavior.
• Temperature Change - Temp Lower Bound The lower bound for allowed temperature values. Used by the Precipitation Climate Change behavior.
• Temperature Change - Temp Upper Bound The upper bound for allowed temperature values. Used by the Precipitation Climate Change behavior.

This behavior changes the value of the Mean Annual Precipitation parameter of the SORTIE plot. This can be used to simulate the effects of climate change. If the run does not have a behavior that uses precipitation, this will have no effect.

How it works

The value for plot precipitation is a function of time elapsed since the start of the run, as follows:

where:

• P is the mean annual precipitation, in mm, at time t
• P₁ is the mean annual precipitation value at the start of the run, as assigned in the Plot parameters
• B is the Precipitation Change - B parameter
• C is the Precipitation Change - C parameter
• t is the time elapsed, in years, since the start of the run

This value is then given to the Plot object which makes it available to other behaviors in the run.

You can set bounds on the possible precipitation values using the Precipitation Change - Precip Lower Bound and Precipitation Change - Precip Upper Bound parameters. Values are not allowed to go outside these limits.

How to apply it

Add this behavior to the run. You can use it alone or in addition to the Temperature Climate Change behavior. You do not need to assign this behavior to trees.

This behavior changes the value of the Mean Annual Temperature parameter of the SORTIE plot. This can be used to simulate the effects of climate change. If the run does not have a behavior that uses temperature, this will have no effect.

How it works

The value for plot temperature is a function of time elapsed since the start of the run, as follows:

where:

• T is the mean annual temperature, in degrees C, at time t
• T₁ is the mean annual temperature value at the start of the run, as assigned in the Plot parameters
• B is the Temperature Change - B parameter
• C is the Temperature Change - C parameter
• t is the time elapsed, in years, since the start of the run

This value is then given to the Plot object which makes it available to other behaviors in the run.

You can set bounds on the possible temperature values using the Temperature Change - Temp Lower Bound and Temperature Change - Temp Upper Bound parameters. Values are not allowed to go outside these limits.

How to apply it

Add this behavior to the run. You can use it alone or in addition to the Precipitation Climate Change behavior. You do not need to assign this behavior to trees.