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Jean-Pascal van Ypersele
(vanypersele@astr.ucl.ac.be)
Jean-Pascal van Ypersele
(vanypersele@astr.ucl.ac.be)
Source: IPCC, AR4 (2007)
NB: écart par rapport à la moyenne 1980-1999
Technical Paper: “Climate Change and Water”: www.ipcc.ch/meetings/session28/doc13.pdf
TP Figure 3.4: Ensemble mean change of annual runoff, in percent,
between present (1980-1999) and 2090-2099 for the SRES A1B
emissions scenario (based on Milly et al., 2005).
Water at the end of the 21st century for SRES A1B
Developing countries are the most vulnerable to climate
change (from IPCC TAR)
Based on current model simulations, it is very
likely that the meridional overturning circulation
(MOC) of the Atlantic Ocean will slow down
during the 21st century.
longer term changes not assessed with confidence
Temperatures in the Atlantic region are projected
to increase despite such changes due to the
much larger warming associated with projected
increases of greenhouse gases.
With 1 metre sea-level rise: 63000 ha below sea-level in
Belgium (likely in 22nd century, not impossible in 21st century)
(NB: flooded area depends on protection)
Source: N. Dendoncker (Dépt de Géographie, UCL), J.P. van Ypersele et P. Marbaix
(Dépt de Physique, UCL) (www.climate.be/impact)
With 8 metre sea-level rise: 3700 km2 below sea-level in Belgium
(very possible in year 3000)
(NB: flooded area depends on protection)
Source: N. Dendoncker (Dépt de Géographie, UCL), J.P. van Ypersele et P. Marbaix
(Dépt de Physique, UCL) (www.climate.be/impact)
• Some adaptation is occurring now, faces
limitations and barriers
• Other stresses can exacerbate vulnerability
• Vulnerability depends also on development
paths
• Sustainable development can reduce
vulnerability
• Mitigation can reduce, delay or avoid impacts
I Risks to unique and threatened systems
II Risks from extreme climate events
III Distribution of Impacts
IV Aggregate Impacts
V Risks from large-scale discontinuities
Source: IPCC TAR WG2 (2001)
Jean-Pascal van Ypersele
(vanypersele@astr.ucl.ac.be)
Jean-Pascal van Ypersele
(vanypersele@astr.ucl.ac.be)

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What do we know, according to IPCC (WG II)?

  • 1.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8. Jean-Pascal van Ypersele (vanypersele@astr.ucl.ac.be) Source: IPCC, AR4 (2007) NB: écart par rapport à la moyenne 1980-1999
  • 9.
  • 10. Technical Paper: “Climate Change and Water”: www.ipcc.ch/meetings/session28/doc13.pdf
  • 11. TP Figure 3.4: Ensemble mean change of annual runoff, in percent, between present (1980-1999) and 2090-2099 for the SRES A1B emissions scenario (based on Milly et al., 2005). Water at the end of the 21st century for SRES A1B
  • 12.
  • 13.
  • 14.
  • 15.
  • 16. Developing countries are the most vulnerable to climate change (from IPCC TAR)
  • 17.
  • 18.
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26.
  • 27. Based on current model simulations, it is very likely that the meridional overturning circulation (MOC) of the Atlantic Ocean will slow down during the 21st century. longer term changes not assessed with confidence Temperatures in the Atlantic region are projected to increase despite such changes due to the much larger warming associated with projected increases of greenhouse gases.
  • 28.
  • 29. With 1 metre sea-level rise: 63000 ha below sea-level in Belgium (likely in 22nd century, not impossible in 21st century) (NB: flooded area depends on protection) Source: N. Dendoncker (Dépt de Géographie, UCL), J.P. van Ypersele et P. Marbaix (Dépt de Physique, UCL) (www.climate.be/impact)
  • 30. With 8 metre sea-level rise: 3700 km2 below sea-level in Belgium (very possible in year 3000) (NB: flooded area depends on protection) Source: N. Dendoncker (Dépt de Géographie, UCL), J.P. van Ypersele et P. Marbaix (Dépt de Physique, UCL) (www.climate.be/impact)
  • 31.
  • 32. • Some adaptation is occurring now, faces limitations and barriers • Other stresses can exacerbate vulnerability • Vulnerability depends also on development paths • Sustainable development can reduce vulnerability • Mitigation can reduce, delay or avoid impacts
  • 33. I Risks to unique and threatened systems II Risks from extreme climate events III Distribution of Impacts IV Aggregate Impacts V Risks from large-scale discontinuities Source: IPCC TAR WG2 (2001)