Tolerating the Right Kinds of Uncertainty Translational Climate Model and Data Analysis Andy Morse, Cyril Caminade, Dave MacLeod, Anne Jones School of.

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Presentation transcript:

Tolerating the Right Kinds of Uncertainty Translational Climate Model and Data Analysis Andy Morse, Cyril Caminade, Dave MacLeod, Anne Jones School of Environmental Sciences, University of Liverpool, Liverpool Workshop at UKCDS - London, May 2012

Overview User questions and needs Climate Data, Seasonal Forecasts, Climate Projections (today +/- 30 years, +6 months) Research examples Challenges

User Questions and Needs How important is the role of climate? Rank impacts of climate. Specifically – Onset and cessation of rainy season Quality of rainy season e.g. frequency of long break cycles Trends in drier* than, average years or seasons * wetter, hotter, colder Onset of drought Sector focused? Concentrate on sector common questions.

Data and models Define current climates – gridded data – reanalysis, satellite, observations; station data (access and quality issues) Seasonal Forecasts (forthcoming rains, seasonal temperatures) Climate Projections (for near future +20 years, changes in seasonal or annual means and distributions)

Research Examples – Gridded Data Monsoon onset climate in Senegal. Mean onset of the rainy season (per decades or 10 days) based on the Hachigonta criterion: First decade with 25mm followed by two decades of 20mm. Based on the TRMM satellite data for the period

Research Examples – Seasonal Forecasts DEMETER multi-model malaria forecasts for upper tercile malaria, Botswana, November forecast months 4-6 (FMA), compared to observed anomalies from published index. After Jones and Morse, 2010, J Climate. 6 hits, 1 miss 4 false alarms and 9 correct rejections. Decision threshold, P

Research Examples Temperature PDF type figure for Kaffrine in Senegal for the dry based on the SRESA1B ensemble. Future climate ( ) is compared to the recent climatic context ( ). An average of four grid points around the region was retained for the eight ENSEMBLES Regional Climate models. The envelope depicts the spread in the multi-model ensemble (two standard deviations of the model ensemble)

Challenges Need for honest (independent) broker of climate model data Stronger science base and science use by humanitarian agencies (perhaps through mutual body?) Questions of climate science research interest that also benefit humanitarian agencies i.e. dual question Key Humanitarian Challenge for Climate Scientists – Develop sustained community use of seasonal forecast products (rainfall) by demonstrating real world economic value

Final Thought

Cost-loss assessment (DEMETER) Theoretical cost/loss versus potential economic value, V Expensive to take action (never act) Cheap to take action (always act) after Jones and Morse, 2010 JClimate Malaria forecasts for above upper tercile malaria, Botswana, November forecast months 4-6 (FMA), compared to observed anomalies from published index. DEMETER (ROCA=0.67) ERA-40 (ROCA=0.88) Action taken Event occurs YesNo YesCC NoL0 For probability forecasts, choose decision threshold to maximise value V