Connections and Key Scientific Issues:

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Connections and Key Scientific Issues A
Terrestrial Perspective
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How do we get from Point A to Point B ?
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Timing is everything

• Trajectories of change
• Sequence and linkages

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Timescale of change in terrestrial
biogeochemistry and energy balance is longer than
timescale of major climatic oscillations.
Spatial scales are generally finer.
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Major need Study systems that are clearly
changing, focus on linkages not single processes
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Scaling up How can we make broad regional
predictions from fine-scale measurements?
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Williams and Rastetter 1999
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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 Nutrien
ts Scales of change longer time scale, coarser
space scale than climate oscillations.
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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
1983-1995 are from Shaver et al. 2001 data from
2000 are unpublished.
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SYSTEM PROCESS