Discussion
Match each proxy with the resolution and span it typically offers.
List I
A. Tree rings
B. Ice cores
C. Ocean sediments
D. Corals
List II
1. centennial to millennial over millions of years
2. annual resolution over centuries to millennia
3. monthly resolution over centuries
4. annual to decadal over hundreds of thousands of years
Answer: B
Correct answer: A-2, B-4, C-1, D-3
Resolution and span trade against one another across the four archives. Tree rings give annual resolution over centuries to millennia. Ice cores give annual to decadal resolution over hundreds of thousands of years. Ocean sediments accumulate so slowly that they smooth to centennial or millennial resolution but reach back millions of years. Corals band monthly but live only centuries.
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