SpringerImages - Simulated time series (10-year means) of a changes in GDD0 and b changes in fraction of land surface covered by forest, shown as deviations from the preindustrial mean (1,000–250 yr BP). Both are calculated for the area north of 60°N. The preindustrial means for GDD0 and forest fraction are 1,287 degree days and 0.37, respectively

$Simulated time series (10-year means) of a changes in GDD0 and b changes in fraction of land surface covered by forest, shown as deviations from the preindustrial mean (1,000–250 yr BP). Both are calculated for the area north of 60°N. The preindustrial means for GDD0 and forest fraction are 1,287 degree days and 0.37, respectively$

Caption

Simulated time series (10-year means) of a changes in GDD0 and b changes in fraction of land surface covered by forest, shown as deviations from the preindustrial mean (1,000–250 yr BP). Both are calculated for the area north of 60°N. The preindustrial means for GDD0 and forest fraction are 1,287 degree days and 0.37, respectively

Extracts from the Article What's this?

Averaged over the area north of 60°N, the GDD0 index decreases moderately by 210 from 1,490 to 1,280 degree days (Fig. 16 a).

Since temperature is one of the main factors controlling vegetation cover at the high northern latitudes, the shortening of the growing season is responsible for a decrease in the fractional forest cover by 0.09 (from 0.45 to 0.36, Fig. 16 b).

However, compared to the 100 km southward tree line shift found in proxy records in the MacKenzie delta, the model appears to have overestimated the response of the vegetation, as seen in the strong reduction in forest fraction in Fig. 16 a, b..

Viewing this image requires a subscription. If you are a subscriber, please log in.

Other Images from this Article

License

This image is copyrighted by Springer-Verlag.

The image is being made available for non-commercial purposes for subscribers to SpringerImages. For more information on what you are allowed to do with this image, please see our copyright policy.

If you would like to obtain permissions for the re-use or re-print of this image, please click here.