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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 />
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