Figure 8.30: Consequences of a Downward EDC Shift on System Stability
Figure 8.30 illustrates two critical consequences of a downward shift in the Environmental Dynamics Curve (EDC). Firstly, it demonstrates that the system becomes more fragile, requiring only a minor shock (like a single hot year) to be pushed past its tipping point towards a low-ice state. Secondly, the figure's right panel shows that a sufficiently large downward shift can completely eliminate the stable high-ice equilibrium, leaving the low-ice state as the only possible outcome.
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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