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11 IMSC Session Program<br />

Construction of high resolution monthly temperature<br />

scenarios for North America<br />

Tuesday - Parallel Session 5<br />

Guilong Li 1 , Xuebin Zhang 2 and Francis Zwiers 2<br />

1 Atmospheric Science and Application Unit — MSC Ontario Region, Environment<br />

Canada, Canada<br />

2 Climate Research Division — ASTD, Environment Canada, Canada<br />

This presentation provides a framework in which dynamical and statistical<br />

downscaling methods are combined to construct monthly temperature scenarios over<br />

North America at 45x45 km resolution. Monthly temperatures from outputs of three<br />

GCMs are dynamically downscaled by three regional climate models (RCMs)<br />

participating the North America Regional Climate Change Assessment Program. The<br />

dynamically downscaled high resolution temperature and low resolution GCM<br />

outputs for the periods 1968-2000 and 2038-2070 are then used to establish statistical<br />

models to link small scale and large scale temperatures. These statistical models are<br />

then applied to GCM projected future temperature changes available from the CMIP3<br />

database, to construct high resolution monthly temperature scenarios for North<br />

America. Uncertainties due to difference in GCMs, in emission scenarios, and internal<br />

variability are analyzed. The end product provides projected monthly temperature<br />

changes in the future at 45 km resolution with different uncertainty ranges.<br />

Abstracts 144

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