Capacity-Building Workshop: Climate Change Adaptation and Water Resources in the Caribbean Region John Charlery – University of the West Indies

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Presentation transcript:

Capacity-Building Workshop: Climate Change Adaptation and Water Resources in the Caribbean Region John Charlery – University of the West Indies

Have we learned anything?

Chapter 11 – Regional Climate Projections’ Summary for Caribbean Simulations) Temperature: ► Annual temperature increases by end of the 21 st century: range from 1.4 o C to 3.2 o C (median of 2.0 o C) ► Average of approx.1 o C increase in sea surface temperature ► Increase in number of very warm days (>30 o C) Rainfall: ► Models project decreases in annual precipitation but increase in intensity (up to 20% by 2050) ► Reduced length of rainy season 7-8% by 2050 ► Increased length of dry season 6-8% by 2050 Conclusion from The A1B Model Broad agreement with IPCC-WG1 (Chapter 11 – Regional Climate Projections’ Summary for Caribbean Simulations) Temperature: ► Annual temperature increases by end of the 21 st century: range from 1.4 o C to 3.2 o C (median of 2.0 o C) ► Average of approx.1 o C increase in sea surface temperature ► Increase in number of very warm days (>30 o C) Rainfall: ► Models project decreases in annual precipitation but increase in intensity (up to 20% by 2050) ► Reduced length of rainy season 7-8% by 2050 ► Increased length of dry season 6-8% by 2050

Conclusion from the A2 and B2 Scenarios models (PRECIS) General drying across the Caribbean basin: The decreases in rainfall range from 25 to 50% depending on the scenario and section of the Caribbean basin The exception to the overall drying trend is in the far north of the Caribbean, including western Cuba and the southern Bahamas – all are up to 25% wetter under the scenarios.

Conclusion from the A2 and B2 Scenarios models (PRECIS) The effect of climate change appears to enhance the existing climatic pattern: –Making the wet and dry zones wetter and drier respectively, during the first 4 – 6 months of the year. –In May to October the entire Caribbean is up to 25% drier. –The changes in average rainfall show a pronounced north-south gradient in rainfall change during the January to April dry season. –Indicates summer drying to become more severe during the wet season.

Changes in Monthly Rainfall Patterns Scenario A1B 2070’s – 1990’s Source: Cashman, Nurse, Charlery (JED, 2010)

So what do we do now?

Source: Glen Milne (copyright 2001) )

Annual Mean Temperature Anomaly BarbadosTrinidad St. LuciaDominica

Barbados’ Climate Change Source: Cashman, Nurse, Charlery (JED, 2010)

Barbados Extreme Temps

Fundamental Questions What changes in climate are we talking about? Data versus Information What might be the implications for water resources/management? Identifiable and Measurable quantifiers What mitigation/adaptation actions could be taken? Cost versus Value Then we can ask the: Who, Where, When, How