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