Fig. 4.

The time series of permafrost temperatures measured by Romanovsky and Osterkamp. Temperatures measured annually at 20 m depths in boreholes along the Dalton Highway south of Prudhoe Bay, Alaska. Locations are the following: West Dock 70^o18′N, 148^o25′W; Deadhorse 70^o11′N, 148^o27′W; Franklin Bluffs 70^o00′N, 148^o40′W; Galbraith Lake 68^o29′N, 149^o29′W; Happy Valley 69^o09′N, 148^o49′W