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Climate Change Scenarios for Southeastern South America Mario Bidegain Facultad de Ciencias – Univ.República - URUGUAY AIACC LA32/LA26 Ines Camilloni Facultad de Ciencias – Univ.Buenos Aires - ARGENTINA AIACC LA26 AIACC II Latin America/Caribbean Regional Workshop
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Climate Change Scenarios for Southeastern South America Mario Bidegain Facultad de Ciencias – Univ.República - URUGUAY AIACC LA32/LA26 Ines Camilloni Facultad de Ciencias – Univ.Buenos Aires - ARGENTINA AIACC LA26 AIACC II Latin America/Caribbean Regional Workshop 24-27 August 2004, Buenos Aires, Argentina
OUTLINE • What GCMs outputs were selected from IPCC DDC and why? • What SRES scenarios were selected? • What variables were selected for this study? • Climate Change scenarios for the south of South America
Spatial Correlation for Sea Level Pressure between GCMs outputs and NCEP reanalysis
Sea Level Pressure anomalies: GCMs vs.NCEP reanalysis CSIRO-NCEP (1961-2000) HADCM3-NCEP (1950-2000) NCEP (1950-2000) ECHAM4-NCEP (1990-2000)
Spatial Correlation for Temperature between GCMs and University Delaware reanalysis
Spatial Correlation for Precipitation between GCMs and Univ. Delaware reanalysis
What GCM outputs were selected from IPCC DDC? ECHAM4 1990-2100 CSIRO-Mk2 1961-2100
Future temperature changes for the south of South America (HADCM3 SRES A2)
Future temperature changes for the south of South America (ECHAM4 SRES A2) 2020 SRES-A2a 2050 SRES A2a 2080 SRESA2a
Future precipitation changes for the south of South America (HADCM3 SRES A2) 2020 SRES-A2a 2050 SRES A2a 2080 SRESA2a
Future precipitation changes for the south of South America (ECHAM4 SRES A2)
Precipitation and Temperature Changes Argentina 4 GCMs (2070-99 vs. 1961-90)
Precipitation and Temperature Changes Uruguay 4 GCMs (2070-99 vs. 1961-90)
CONCLUSIONS • Good performance of GCMs in temperature (very good in winter) and SLP, poor in rainfall (underestimation in the southeast of SA), but improved performance respect to previous GCMs versions • After performance experiment 3 GCMs was selected to construct climate scenarios over region (HADCM3, ECHAM4 and CSIRO). • The selected variables are: precipitation, temperature and SLP (surface winds). • Statistical (SDSM) downscaling will be applied to improve the local climate change regional scenarios for selected locations. • Dynamical downscaling (PRECIS?), will be applied to improve future regional climate scenarios.