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| Motivation: |
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| - simplest
option |
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| - | “cascade” paradigm easy to apply to
tracers |
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| - | “agreement”
with observations |
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| - | if know what inert tracer should do, easy
to |
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| diagnose when biology is dominant effect |
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| Drawbacks: |
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| - | far from clear that any are accurate
models |
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| - unlikely
that cascading range exists in practice |
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| - forcing
only at large scale |
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