Question 89·200 Super-Hard SAT Reading Questions·Expression of Ideas
While researching a topic, a student has taken the following notes:
- The Atlantic Meridional Overturning Circulation (AMOC) carries warm surface water northward in the Atlantic Ocean.
- An area of the North Atlantic that has warmed less than most of the planet is called the North Atlantic warming hole.
- A weaker AMOC could contribute to this pattern by reducing northward heat transport.
- In a modeling study, researchers kept AMOC strength fixed while independently varying winds and the exchange of heat between the ocean and atmosphere.
- Several simulations produced a pattern closely resembling the North Atlantic warming hole.
- The study was not designed to identify which process actually caused the observed warming hole.
The student wants to distinguish what the modeling results establish from what they do not establish about the warming hole as an indicator of AMOC weakening. Which choice most effectively uses relevant information from the notes to accomplish this goal?
For rhetorical synthesis questions, translate the stated goal into separate requirements before comparing the choices. Here, a successful answer must accurately state both the implication of the fixed-AMOC simulations and the limit on what those simulations can reveal about the observed climate pattern. Reject choices that confuse demonstrating a possible cause with identifying the actual cause.
Hints
Separate evidence from limitation
Look for one choice that explains both what the fixed-AMOC simulations demonstrate and what the study's design leaves unresolved.
Consider the controlled variable
Ask what can be inferred when a pattern appears even though one proposed cause has been held constant.
Watch for overstatement
Be cautious of choices claiming that the study confirmed the actual cause of the observed warming hole.
Step-by-step Explanation
Identify what the simulations establish
The researchers kept AMOC strength fixed, yet some simulations still produced a warming-hole-like pattern. Therefore, AMOC weakening is not the only process that could produce such a pattern.
Identify the study's limitation
The study was not designed to determine which process caused the real, observed warming hole. Thus, it does not prove that atmospheric changes caused the observation or that AMOC weakening played no role.
Select the appropriately qualified synthesis
The correct choice includes both points: the pattern is not unique to AMOC weakening, but the simulations do not establish the cause of the observed pattern.