1. W. J. Gutowski, R. W. Arritt, G. S. Takle, Z. Pan International Institute of Theoretical and Applied Physics Iowa State University (http://www.pircs.iastate.edu) Project to Intercompare Regional Climate Simulations (PIRCS): Lessons and Suggestions for an Asian RMIP Asian RMIP Workshop (June 2000)

2. PIRCS Participating Models Danish Met. Inst. (HIRHAM4; J.H. Christensen, O.B. Christensen)Danish Met. Inst. (HIRHAM4; J.H. Christensen, O.B. Christensen) Université du Québec à Montréal (D. Caya, S. Biner)Université du Québec à Montréal (D. Caya, S. Biner) Scripps Institution of Oceanography (RSM; J. Roads, S. Chen)Scripps Institution of Oceanography (RSM; J. Roads, S. Chen) NCEP (RSM; S.-Y. Hong)NCEP (RSM; S.-Y. Hong) NASA - Marshall (MM5/BATS; W. Lapenta)NASA - Marshall (MM5/BATS; W. Lapenta) CSIRO (DARLAM; J. McGregor, J. Katzfey)CSIRO (DARLAM; J. McGregor, J. Katzfey) Colorado State University (ClimRAMS; G. Liston)Colorado State University (ClimRAMS; G. Liston) Iowa State University (RegCM2; Z. Pan)Iowa State University (RegCM2; Z. Pan) Iowa State University (MM5/LSM; D. Flory)Iowa State University (MM5/LSM; D. Flory) Univ. of Maryland / NASA-GSFC (GEOS; M. Fox-Rabinovitz)Univ. of Maryland / NASA-GSFC (GEOS; M. Fox-Rabinovitz) SMHI / Rossby Centre (RCA; M. Rummukainen, C. Jones)SMHI / Rossby Centre (RCA; M. Rummukainen, C. Jones) NOAA (RUC2; G. Grell)NOAA (RUC2; G. Grell) ETH (D. Luethi)ETH (D. Luethi) Universidad Complutense Madrid (PROMES; M.Gaertner)Universidad Complutense Madrid (PROMES; M.Gaertner) Université Catholique du Louvain (P. Marbaix)Université Catholique du Louvain (P. Marbaix) Argnonne National Lab (MM5 V3; J. Taylor, J. Larson)Argnonne National Lab (MM5 V3; J. Taylor, J. Larson)

3. PIRCS Mission Evaluate regional climate simulation by mesoscale models, using a common framework Asian RMIP Workshop (June 2000)

4. Mesoscale Targets are Important! Mesoscale Convective SystemsMesoscale Convective Systems Low-Level JetsLow-Level Jets Regional OrographyRegional Orography Asian RMIP Workshop (June 2000)

5. Further Motivation GCIP/G-NEP  GCIP/G-NEP  Agricultural  Water cycle variability  Data availability  Strong signal Asian RMIP Workshop (June 2000)

6. Summer 1988 - Drought Adapted from CAC, NWS, NOAA Jet Stream Cool & Damp Weak & Dry Southerly Flow Heat Wave

7. Summer 1993 - Flood Adapted from CAC, NWS, NOAA Jet Stream Cool Warm & Moist Southerly Flow FLood

8. Model Domains

9. 500 hPa heights: Root Mean Square Difference from Reanalysis 1988

10. 500 hPa heights: Root Mean Square Difference from Reanalysis 1993

11.  500 hPa Heights (1993-1988) ~ Reanalysis ~

12.  500 hPa Heights (1993-1988) ~ PIRCS Ensemble ~

13. LLJ figures

14. Precipitation Regions Upper Miss.

15. Comparison of PIRCS models with gridded precipitation analysis

17. Mesoscale circ. & precip. Figures - day 160

18. Precip. Bias June 1988 [mm/d] Composite -10 -8 -6 -4 -2 0 +2 +4 +6 +8 +10

19. Precip. Bias July 1993 [mm/d] -10 -8 -6 -4 -2 0 +2 +4 +6 +8 +10 Composite

20. 1993 Contours:  e (  = 6 K) Shaded: Precip > 300 mm

21. Tmin/max figures

25. Soil moisture spin-up: problem?

26. Lessons Ensembles are important –Reveal common problems –Reveal unique problems –No model is “best” Distinction between problems of –Lateral forcing/dynamics (common) –Surface processes (unique)

27. Lessons Interannual climate variation –Simulated in large-scale dynamics –Muted in precipitation response Lessons

28. Future Plans Same grid, multi-year –More truly climate simulation –Reduce initial conditions problem Asian RMIP Workshop (June 2000)

29. Future Plans Same grid, multi-year –More truly climate simulation –Reduce initial conditions problem PIRCS 2: South America - LBA –ENSO –Atmospheric heat source –Moisture inflow from Atlantic Ocean –Low-Level Jet? –Significant observational data bases Asian RMIP Workshop (June 2000)

30. Suggestions for Asian RMIP (1) Coordinate archive convections with PIRCS-2 (under development) - promote wider access/analysis - sharing of diagnostic tools - sharing of tools to transform output to standard format (2) Use NetCDF (3) Establish common file naming conventions Asian RMIP Workshop (June 2000)

31. Suggestions for Asian RMIP (4) Other variables? PIRCS 2 includes (among others): l CAPE (3 hr) l ISCCP clouds (3 hr) l OLR (3 hr) l 500 hPa vertical motion (3 hr) l Precipitable water (3 hr) l diabatic heating (monthly) Asian RMIP Workshop (June 2000)

32. Proposal for Standard Diagnostics and Data Interchange Modules in PIRCS Jay Larson Mathematics and Computer Science Division / Argonne National Laboratory www.mcs.anl.gov/~larson

33. An Intercomparison Wish List Common utilities for: Writing and re-reading the agreed-upon output format Reading / interpolating model input data format Computation of diagnostic fields Quality control Visualization and analysis tools that work with the output format

34. Schematic for PIRCS Diagnostics and Output Application Program: We supply application code, complete with time-stepping, filename generation, output module, and library routine calls User supplies module to read the model’s history files, returning the model fields required by the PIRCS application

35. Acknowledgments Acknowledgments Primary Funding:Primary Funding: Electric Power Research Institute (EPRI) Guidance/Support:Guidance/Support: Andrew Staniforth, Eugenia Kalnay, Filippo Giorgi, Roger Pielke, AMIP group Special Thanks:Special Thanks: Participating Modelers Asian RMIP Workshop (June 2000)