land-atmosphere interaction: is it a positive feedback?

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land-atmosphere interaction is it a positive
feedback? (soil moisture, vegetation, dust...,
evaporation, cloud cover...)
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late 20th century surface temperature changes
IPCC 4AR end 20th century PreIndustrial sfc
temp difference Biasutti and Giannini 2006 (GRL)
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IPCC 4AR simulations late 20th century climate
change
Biasutti and Giannini, GRL 2006
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Sahel climate change 20th century 21st
century
Biasutti and Giannini, 2006 (GRL)
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19 Coupled GCM (IPCC 4AR) recent and future
temperature changes
A1B (end 21st) - end 20th end 20th -
PreInd
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• CONCLUSIONS (climate science informing policy)
• Climate change is already here -
• the recent climate shift in the Sahel is a
  prime example of
• potential changes to come, as the global
  climate system
• responds to anthropogenic forcings
• --gtgt regional institutions/CILSS have an
  opportunity to take advantage of the
• lessons learned from managing the climate
  shift of the last 30 years
• --gtgt harmonization of desertification and
  climate change issues is overdue!

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• CONCLUSIONS (climate science informing practice -
  climate risk management)
• collaborate on climate science
• improve (two-way) communication
• --gtgt between climate scientists and policymakers
• --gtgt between climate scientists and stakeholders
  in sectors vulnerable to climate

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http//iridl.ldeo.columbia.edu/index.html http//w
ww-pcmdi.llnl.gov/ipcc/about_ipcc.php
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West Africa 0-20N, 20W-20E Eastern eq
Africa 10S-10N, 20-50E Southern
Africa 25-10S, 20-40E
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West Africa 0-20N, 20W-20E Eastern eq
Africa 10S-10N, 20-50E Southern
Africa 25-10S, 20-40E
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Held et al., PNAS 2005
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2050-2080 minus 1950-1980
Haarsma et al., GRL 2005