Analyzing a Shift in an Environmental System Model
An environmental model for a polar ice cap uses a dynamic curve to show how the ice extent in one year determines the ice extent in the next. Intersections of this curve with a 45-degree line represent equilibrium points where the ice extent is stable from year to year. Initially, the system has a stable equilibrium with high ice cover. Now, imagine a persistent, long-term increase in average global temperatures occurs. This change causes the entire dynamic curve to shift downwards. Based on this downward shift, explain the most significant potential consequence for the original high-ice-cover equilibrium and the reason for this change.
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Increased System Vulnerability from the Downward Shift of the EDC
Narrowing Stability Margin from EDC Shift
Figure 8.30: Consequences of a Downward EDC Shift on System Stability
An ecological model describes the year-to-year extent of Arctic sea ice using a dynamic curve, which shows the relationship between the ice extent in one year and the extent in the following year. The model currently shows a stable equilibrium with high ice cover. Consider two scenarios:
Scenario 1: A single, unusually warm year causes a large amount of ice to melt, but long-term climate conditions remain unchanged. Scenario 2: A sustained, multi-decade trend of rising atmospheric and ocean temperatures occurs.
How would the model most accurately represent the distinct effects of these two scenarios on the sea ice system?
Modeling Long-Term Climate Impacts on Arctic Sea Ice
In a model of Arctic sea ice dynamics, a sustained increase in global average temperatures that makes each winter milder than the last is represented as a movement along a stable Environmental Dynamics Curve to a new, lower equilibrium point.
Analyzing a Shift in an Environmental System Model