6. apríl 2011. Martha Raynolds: Searching for the effects of climate change on tundra vegetation

Martha Raynolds

Marta Raynolds

Martha Raynolds, gróður- og fjarkönnunarfræðingur við Háskólann í Alaska, Fairbanks, flytur erindi sitt „Searching for the effects of climate change on tundra vegetation“ á Hrafnaþingi miðvikudaginn 6. apríl kl. 15:15.

Erindið verður flutt á ensku.

It is well-known that northern latitudes are warming faster than the Earth as a whole. This warming has been documented for several decades, but the effect on arctic vegetation has been very difficult to document. Experimental results give us some indication of what types of changes to look for. However in natural conditions the complex interactions between the soils, permafrost, vegetation and atmosphere, as well as natural variability, make these changes hard to measure. Satellite remote sensing, repeat photography, tree-ring studies (on shrubs) and permanent vegetation plots provide information on the varied response of vegetation to climate change in different parts of the Arctic.

Upptaka af erindi mistókst en hægt að skoða glærur af erindinu (pdf, 7,4 MB)

10×10 m permanently-marked grid
Mynd: M.K. Raynolds

10×10 m permanently-marked grid set up in 2005 to characterize arctic vegetation at Isachsen, Ellef Ringnes Island, Nunavut, Canada.

Open-topped chamber
Mynd: M.K. Raynolds

The open-topped chamber at Toolik Lake, Alaska mimics the effect of a 2-degree C warming in temperature. Similar chambers have been set up at a number of sites throughout the Arctic as part of the International Tundra Experiment to examine the effects of