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Dr. Elyn Humphreys: Biometeorology in the barrens

  Dates & Events

Mittwoch, 25. Januar 2012, 15.15 Uhr

Seminar announcement at AWI

Building A43 - lecture room at AWI

Dr. Elyn Humphreys (Department of Geography and Environmental Studies, Carleton University, Ottawa / Canada)

„Biometeorology in the barrens:  Spatial and temporal variation in net ecosystem productivity of Canadian Arctic tundra"


Tundra ecosystems have the potential to exert both negative and positive feedbacks on climatic change through their exchange of CO2 with the atmosphere.  In this talk, the current growing season balance between CO2 uptake by photosynthesis and release by respiration for seven sites throughout the Canadian Arctic will be discussed.  Multi-year records of CO2 exchange at two low Arctic sites are used to highlight the factors that tend to increase the net ecosystem productivity of these sites.  Using a common summer of measurements, the differences in net ecosystem productivity between low and high Arctic tundra will be discussed including the implications for modeling Arctic ecosystem response to climatic change.

 All are welcome