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Contributions of natural and anthropogenic forcings<br />

—expressed by ratio of explainable variance<br />

Globalland<br />

Globalocean<br />

Northern<br />

extratropics<br />

Southern<br />

extratropics<br />

Indian<br />

Ocean/Western<br />

Pacific Warm Pool<br />

Tropical<br />

Eastern<br />

Pacific<br />

N.<br />

Pacific<br />

N.<br />

Atlantic<br />

NAT 7.4% 1.6% 27.3% 26.1% 1.1% 0.4% 8.0% 18.9%<br />

Athro 76.6% 70.2% 61.5% 48.0% 76.7% 41.1% 47.2% 6.5%<br />

For land and hemispheric means, external forcings could explain most of the variance.<br />

Contributions from internal variability are larger than from external forcings in the tropical<br />

eastern Pacific and North Atlantic region .<br />

13

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