Breakout Session IV - Impacts and Consequences of Global Change

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Breakout Session IV - Impacts and Consequences of
Global Change
Breakout Topic on Shift in Biome
Seasonality Alfredo Huete and Alex Chekalyuk
the role of climate change and human impacts on
seasonal biome shifts (length of growing seasons
disrupted seasonal cycles)
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Marine Biogeographic Provinces
Oliver et al.
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Jan 2006

• Gyre area
• Jan 1998
• To
• Dec 2006

Irwin et al.
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Combined Global Gyres
Total C fixation (g / d) Trend
Combined Tropical Seas
Jan 1998 Dec 2006
Irwin et al.
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Temperature effect on the Shift of Biome
Seasonality--Interannual Trend in Greenup Onsets
(1982-2005)
Zhang et al. 2007
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Human impacts of land surface phenology
Example- following the collapse of the Soviet
Union are not uniform across Kazakhstan (de Beurs
and Henebry 2004, 2005).
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(No Transcript)
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Needs

1. Need for in-situ observations, particularly those
   providing seasonal information (towers, web cams,
   citizen science, moving platforms, fisheries
   data, new sensors technologies)
2. Satellite vs. surface intercomparisons with
   respect to seasonality
3. Need for long-term inter-comparability of
   multiple sensor time series datasets.
4. Integration of fine and moderate resolution
   sensors (scaling)
5. Integration of passive, active, geostationary
   satellite data

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Challenging questions

1. What are the nominal variations in biome
   seasonality
2. What are the controls in biome seasonality?
   (climate, human activities, nutrients)
3. Can we identify land - ocean seasonal
   interactions (lags)?
4. What are the mechanisms and drivers of change/
   shifts in seasonality observed from satellites?
   (stress agents, multiple stressors)
5. What are the resiliences of biomes to change?
6. What are thresholds to abrupt changes in
   seasonality? (extreme events)
7. What are the potential impacts of biome seasonal
   shifts on biodiversity, carbon/water cycling,
   climate, etc..