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Anticipated Changes for CAM4 Part 1 - CESM

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New Hybrid Terrain<br />

following/isentropic<br />

(Chen & Rasch) Rasch<br />

Diff<br />

Control<br />

Vs<br />

ERA<br />

Diff<br />

New<br />

Model<br />

Vs<br />

Control<br />

•<br />

Removes known computational<br />

artifacts in sigma coordinate<br />

models<br />

• Significant reduction in a<br />

systematic bias present in 22 of<br />

Zonal average<br />

23 models in IPCC AR4<br />

temperature<br />

DJF JJA

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