Self-Correction of the High-Ice Equilibrium After a Shock
The stability of the high-ice equilibrium (point G) is demonstrated by its ability to recover from temporary shocks. The mechanism for this self-correction is that in this region, the Environmental Dynamics Curve (EDC) lies above the 45-degree line. Therefore, if an external shock like an unusually hot year reduces the sea ice to a level E0, the EDC dictates that the ice extent in the following year will be greater. This recovery process, indicated by adjustment arrows in Figure 8.29, continues over subsequent years until the system returns to the stable equilibrium at G.
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Self-Correction of the High-Ice Equilibrium After a Shock
Disruption of the High-Ice Equilibrium by Shocks and Shifts
An environmental system is characterized by a large, stable quantity of sea ice. Observations show that after a temporary, small-scale disturbance (like a slightly warmer year) causes some ice to melt, the system consistently self-corrects over the following periods, returning to its original high-ice level. Which statement best analyzes the underlying dynamic of this system?
Arctic System Resilience
Analyzing System Resilience
A climate model shows a planet's polar region in a stable, high-ice equilibrium. When the model introduces a temporary disturbance, such as a brief period of warmer ocean currents, the system experiences a minor loss of ice but reliably returns to its previous high-ice state over the subsequent periods. Which statement provides the most accurate evaluation of the underlying dynamic responsible for this resilience?
In a model that plots an environmental variable (e.g., sea ice extent) in the current period against its value in the next period, a certain region of the resulting curve is observed to be nearly flat. What does this flatness imply about the system's behavior in that region?
Evaluating Arguments on Climate System Resilience
In a system characterized by a stable, high-ice equilibrium, a temporary warming event that melts a small amount of ice will initiate a positive feedback loop, leading to further, accelerated ice loss.
Match each term related to a stable, high-ice environmental system with the description that best explains its role or characteristic within that system's dynamics.
Two planetary climate models, System A and System B, both currently exhibit a stable, high-ice equilibrium. When subjected to an identical, temporary warming event:
- System A experiences a minor loss of ice and returns to its original state within a few cycles.
- System B experiences a more significant loss of ice and takes much longer to return to its original state.
What does this comparison suggest about the feedback mechanisms governing these two systems?
Predicting Planetary Climate Resilience
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Figure 8.29: Stabilization of Sea Ice After a Shock
Comparison of Modeled Rebound and Pre-1970s Ice Stability
Effect of Large Shocks on a Stable Equilibrium
Consider a climate system that is settled in a stable, high-ice equilibrium. A single, unusually warm year causes a temporary reduction in the total sea ice extent, after which environmental conditions return to their normal long-term average. Based on the principles governing a stable environmental equilibrium, what is the most likely trajectory for the sea ice extent in the subsequent years?
Analyzing Sea Ice Recovery Data
Mechanism of Equilibrium Recovery
An environmental system is in a stable, high-ice equilibrium. A temporary, external event causes a one-time reduction in the ice extent. Arrange the following events to describe the system's self-correction process back towards its original state.
Evaluating Claims About Environmental Stability
In an environmental system at a stable, high-resource equilibrium, a single, temporary negative shock (e.g., an unusually warm year reducing ice) will cause the system to settle into a new, permanently lower equilibrium state.
Interpreting a Climate Model's Response to a Shock
Match each term related to an environmental system's response to a temporary disturbance with its correct description.
In a graphical model of a stable environmental equilibrium, when a temporary shock reduces the resource level below the equilibrium point, the system self-corrects. For this to occur, the curve representing the system's dynamics must lie ____ the 45-degree line in the region between the new, lower resource level and the original equilibrium point.
In a model of an environmental system, the amount of a resource (like sea ice) in one year determines the amount in the next year. The system is currently in a stable, high-resource equilibrium. Following a temporary shock that reduces the resource level, the system begins to self-correct and return to its original state. Which of the following statements best explains the underlying mechanism for this recovery?