Connections and Key Scientific Issues: A Terrestrial Perspective.

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Connections and Key Scientific Issues: A Terrestrial Perspective

How do we get from Point A to Point B ?

Timing is everything Trajectories of change Sequence and linkages

Timescale of change in terrestrial biogeochemistry and energy balance is longer than timescale of major climatic oscillations. Spatial scales are generally finer.

Major need: Study systems that are clearly changing, focus on linkages not single processes

Scaling up: How can we make broad regional predictions from fine-scale measurements?

Williams and Rastetter 1999

New elements: e.g., Winter C turnover “Development” of prev. observed changes: e.g., Shrub abundance Identification of feedbacks: Surface Energy balance C cycling/GH gases Water Nutrients Scales of change: longer time scale, coarser space scale than climate oscillations.

Figure 4. Aboveground net primary production versus biomass, leaf mass, and leaf area in the long-term fertilizer experiment at Toolik Lake, Alaska. Open symbols represent data from control plots; filled symbols represent fertilized plots. For the fertilized plots, the year of harvest is indicated for each data point. Data from are from Shaver et al. 2001; data from 2000 are unpublished.