Faisal S. Syed, Shahbaz M.,Nadia R.,Siraj I. K., M. Adnan Abid, M. Ashfaq, F. Giorgi, J. Pal, X. Bi

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1 ICTP NCP International Conference on Global Change November, 2006, Islamabad Climate Change Studies over South Asia Region Using Regional Climate Model RegCM3 (Preliminary Results) Faisal S. Syed, Shahbaz M.,Nadia R.,Siraj I. K., M. Adnan Abid, M. Ashfaq, F. Giorgi, J. Pal, X. Bi Global Change Impact Studies Centre / Pakistan Meteorological Department Islamabad

2 What are Scenarios? Scenarios are one of the main tools for assessment of future developments in complex systems and are used to determine how conditions may change in the future. A scenario can be defined as a coherent and internally consistent description of a possible future state of the world. it represents one of any number of possible futures, which can be used to provide data for impacts and adaptation studies A2 Storyline and Scenario Family: The A2 storyline and scenario family describes a very heterogeneous world. The underlying theme is self-reliance and preservation of local identities. Fertility patterns across regions converge very slowly, which results in continuously increasing global population. Economic development is primarily regionally oriented and per capita economic growth and technological change are more fragmented and slower than in other storylines.

3 The most common and widely accepted method of scenario construction involves the use of the output of Global Climate Models (GCMs). GCMs are mathematical representations of the large-scale physical processes of the Earth-atmosphere-ocean system that provide a complete and internally consistent view of future climate change The Global Circulation Models (GCMs) provide information about on global scale, typically in grid sizes of 300km x 300km. Whereas the grid size of a Regional Climate Model (RCM) output is typically to 50km x 50km; a 10 times better resolution than that of GCM

4 Design of Climate Change Experiments RegCM3 Driving Data ECHAM ( Max Planck Institute of Meteorology, Germany), FVGCM ( National Aeronautics and Space Administration, USA) Resolution 50 Km Output Data 6 Hourly Model Domain South Asia (Lat 5N to 50N, Lon 55E to 100E) Scenario Analysis Domain A2 Pakistan (Divided into two Sub-regions) Data Set Base Period Future Period ECHAM (30 years) FVGCM (30 years) ERA40 (Reanalysis data) (30years) , (30+30 =60 years) (30 years) NIL

5 Validation of the Model RegCM3

6 Experiments for Validation of Convective Schemes RegCM3 Simulations for winter and Summer (Total 16 Experiments) Summer (JJAS) (8 Experiments) Winter (DJFM) (8 Experiments) Dry Year (1987) (4 Expts) Wet Year (1992) (4 Expts) Dry Year (1985) (4 Expts) Wet Year (1991) (4 Expts)

7 Topography Domain Parameters No. of Grid Points in y direction: 95 No. of Grid Points in x direction: 100 No. of Vertical Levels: 18 Grid Point Separation in Km: 50 Central Latitude: 24.0 Central Longitude: 79.0 Map Projection: ROTMER Boundary Conditions: ERA40 SST: GISST Land Use

8 Grell Convective Scheme, Arakawa - Schubert Closure (JJAS ) Precipitation (mm/day) Observed RegCM3 Observed RegCM3 Temperature (C)

9 Grell Convective Scheme, Fritsch - Chappell Closure (JJAS ) Precipitation (mm/day) Observed RegCM3 Observed RegCM3 Temperature (C)

10 Anthes - Kuo Convective Scheme (JJAS ) Precipitation (mm/day) Observed RegCM3 Observed RegCM3 Temperature (C)

11 Emanuel Convective Scheme (JJAS ) Precipitation (mm/day) Observed RegCM3 Observed RegCM3 Temperature (C)

12 Selected Regions of Pakistan BOX A Northern Pakistan Southern Pakistan BOX B

13 PDFs of Temperature (Box A and Box B)

14 Correlation Maps Temperature Base ( ) RMSE Maps

15 Correlation Maps Precipitation Base ( ) RMSE Maps

16 Summary of Precipitation and Temperature over Selected Regions PRECIPITATION (Monthly) TEMPERATURE (Monthly) CORR RMSE (mm/d) ERA40 % diff (mm/d) (model-cru)/cru *100 BOX A BOX B ECHAM BOX A BOX A BOX B BOX A CORR RMSE ( C) ERA ECHAM 6.27 Diff ( C) (model-cru) BOX B BOX B FVGCM FVGCM BOX A BOX A BOX B BOX B

17 25 20 Scatter Plot of Temperature ( C) BOX-A, ERA40 y = x R 2 = Scatter Plot of Precipitation (mm/d) BOX-A, ERA40 y = 0.519x R 2 = CRU 10 5 CRU ERA40 MODEL 35 Scatter Plot of Temperature ( C) BOX-B, ERA40 5 Scatter Plot of Precipitation (mm/d) BOX-B, ERA40 30 y = x R 2 = y = x R 2 = CRU CRU MODEL MODEL

18 Scatter Plot of Temperature ( C) BOX-A, ECHAM y = 0.998x R 2 = Scatter Plot of Precipitation (mm/d) BOX-A, ECHAM y = 0.789x R 2 = CRU 10 5 CRU MODEL MODEL Scatter Plot of Temperature ( C) BOX-B, ECHAM y = x R 2 = Scatter Plot of Precipitation (mm/d) BOX-B, ECHAM y = x R 2 = CRU 20 CRU MODEL MODEL

19 25 Scatter Plot of Temperature ( C) BOX-A, FVGCM y = x Scatter Plot of Precipitation (mm/d) BOX-A, FVGCM y = 0.425x R 2 = R 2 = CRU 10 5 CRU MODEL MODEL Scatter Plot of Temperature ( C) BOX-B, FVGCM y = x R 2 = Scatter Plot of Precipitation (mm/d) BOX-B, FVGCM y = x R 2 = CRU 20 CRU MODEL MODEL

20 Annual Cycle of Temperature Selected Regions of Pakistan ECHAM Annual Cycle of Precipitation (BOX A) ECHAM Annual Cycle of Temperature (BOX A) ECHAM Precipitation (mm/d) Temperature ( C) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC -10 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Months Months ECHAM CRU ECHAM CRU Annual Cycle of Precipitation (BOX B) ECHAM Annual Cycle of Temperature (BOX B) ECHAM Precipitation (mm/d) Temperature ( C) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 5 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Months Months ECHAM CRU ECHAM CRU

21 Annual Cycle of Temperature Selected Regions of Pakistan FVGCM Annual Cycle of Precipitation (BOX A) FVGCM Annual Cycle of Temperature (BOX A) FVGCM Precipitation (mm/d) Temperature ( C) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC -10 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Months Months FVGCM CRU FVGCM CRU Annual Cycle of Precipitation (BOX B) FVGCM Annual Cycle of Temperature (BOX B) FVGCM Precipitation (mm/d) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Temperature ( C) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Months Months FVGCM CRU FVGCM CRU

22 Climate Change - Annual

23 Temperature Change ( C ) F1 =2050s F2 =2080s ECHAM - F1 ECHAM - F2 FVGCM - F2

24 Absolute Change in Precipitation (mm/day) ECHAM - F1 ECHAM - F2 FVGCM - F2 F1 =2050s F2 =2080s Percentage Change in Precipitation (%) ECHAM - F1 ECHAM - F2 FVGCM - F2

25 Climate Change - Summer

26 Temperature Change ( C ) F1 =2050s F2 =2080s Summer (JJAS) ECHAM - F1 ECHAM - F2 FVGCM - F2

27 Absolute Change in Precipitation (mm/day) ECHAM - F1 ECHAM - F2 FVGCM - F2 F1 =2050s F2 =2080s Percentage Change in Precipitation (%) ECHAM - F1 ECHAM - F2 FVGCM - F2

28 Climate Change - Winter

29 Temperature Change ( C ) F1 =2050s F2 =2080s Winter (DJFM) ECHAM - F1 ECHAM - F2 FVGCM - F2

30 Absolute Change in Precipitation (mm/day) ECHAM - F1 ECHAM - F2 FVGCM - F2 F1 =2050s F2 =2080s Percentage Change in Precipitation (%) ECHAM - F1 ECHAM - F2 FVGCM - F2

31 Climate Change - Summary of Precipitation and Temperature Changes over Selected Regions PRECIPITATION (mm/d) % Change TEMPERATURE ( C) Change (ECHAM, ) (ECHAM, ) Annual Summer (JJAS) Winter (DJFM) BOX A BOX B BOX A BOX B Annual Summer (JJAS) Winter (DJFM) (ECHAM, ) (ECHAM, ) BOX A BOX B BOX A BOX B (FVGCM, ) (FVGCM, ) BOX A BOX A BOX B BOX B

32 Climate Change - Annual Cycle of Temperature over Selected Regions of Pakistan ECHAM Annual Cycle of Temperature (BOX A) ECHAM Annual Cycle of Precipitation (BOX A) ECHAM 20 4 Temperature ( C) Precipitation (mm/d) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Months Months BASE FUTURE ( ) BASE FUTURE ( ) Annual Cycle of Temperature (BOX B) ECHAM Annual Cycle of Precipitation (BOX B) ECHAM Temperature ( C) Precipitation (mm/d) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Months Months BASE FUTURE ( ) BASE FUTURE ( )

33 Climate Change - Annual Cycle of Temperature over Selected Regions of Pakistan FVGCM Annual Cycle of Temperature (BOX A) FVGCM Annual Cycle of Precipitation (BOX A) FVGCM Temperature ( C) Precipitation (mm/d) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 0.5 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Months Months BASE FUTURE ( ) BASE FUTURE ( ) Annual Cycle of Temperature (BOX B) FVGCM Annual Cycle of Precipitation (BOX B) FVGCM Temperature ( C) Precipitation (mm/d) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Months Months BASE FUTURE ( ) BASE FUTURE ( )

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35 Acknowledgement We are thankful to Earth System Physics Group (ESP), of Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste Italy for Providing the GCMs Data and Technical Support.

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