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Negative Feedback at the High-Ice Equilibrium (Virtuous Circle)
In the Environmental Dynamics Curve (EDC) model, the high-ice equilibrium (point G) is a stable state maintained by a strong negative feedback process, or 'virtuous circle'. This strong feedback makes the system resilient, allowing it to absorb temporary disturbances—such as warming from seasonal or decadal ocean current variations—and rebound to its stable state. Graphically, the EDC is nearly flat in this region, indicating that small disturbances are dampened, keeping the system in a stable, high-ice state.
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Figure 8.27: Environmental Dynamics, Multiple Equilibria, and the S-Shaped EDC
Negative Feedback at the Low-Ice Equilibrium
Negative Feedback at the High-Ice Equilibrium (Virtuous Circle)
Figure 8.28: Climate Equilibria Feedback Loops
Basins of Attraction in the Environmental Dynamics Model
An environmental system's state from one year to the next is modeled by an S-shaped curve. In the middle region of this curve, the slope is very steep, meaning a small change in the system's state in one year causes a much larger change in the following year. What does this steepness imply about the system's dynamics within this specific region?
System Resilience in a High-Quality State
Explaining Persistent Ecosystem Degradation
A system's environmental quality from one year to the next is modeled by an S-shaped curve plotted against a 45-degree line (where quality is unchanged). Match each region of the S-shaped curve with its corresponding dynamic characteristic.
According to the model represented by the S-shaped Environmental Dynamics Curve, the stable, low-quality environmental state, often described as a 'vicious circle', is maintained by a positive feedback process.
Ecosystem Response to a Major Shock
Analyzing the Shape of the Environmental Dynamics Curve
An environmental system, modeled by an S-shaped curve that plots its state in one period against the next, is currently in a stable, high-quality equilibrium (e.g., extensive sea ice). Graphically, this corresponds to a point where the S-shaped curve is nearly flat and intersects a 45-degree line. Why is this equilibrium considered resilient to small, temporary negative shocks?
Coral Reef Ecosystem Shift
An ecosystem's quality is observed over several years. Initially, it is in a healthy, resilient state. Following a major negative shock, it rapidly degrades and settles into a persistently poor state. Arrange the following descriptions of the system's dynamics into the correct chronological order, starting from the initial healthy state.
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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