Extending the GEOS-CHEM to the Stratosphere —Some Issues - PowerPoint PPT Presentation

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Extending the GEOS-CHEM to the Stratosphere —Some Issues

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  1. Extending the GEOS-CHEM to the Stratosphere—Some Issues Tom Zhao and Mian Chin (June 2-3, 2003) OUTLINE 1. More Species and Stiffness 2. Widened Photolysis Spectral 3. Increased Computational Load 4. Restart File 5. Comments

  2. GEOS-CHEM V. 4.5 GEOS-CHEM V. 4.5 + Stratosphere Chem. • 32 Families • NOx, HOx, CLx, BRx, Ox, PAN, CO, ALK4, ISOP, HNO3, H2O2, ACET, MEK, ALD2, RCHO, MVK, MACR, PMN, PPN, R4N2, PRPE, C3H8, CH2O, C2H6, MP, HCL, CH4, CH3CL, CCL4, CFCL3, CF2CL2, CH3BR, N2O • Photolysis • Fast-J2 (Bian et al.) • l1=177-291nm; l2=291-850nm • Computational Load • SGI 2000/16CPU/18 hrs walltime • 6 GB MEM • 140 CPU hours/day • Restart Frequency • 1 Day • 24 Families • NOx, Ox, PAN, CO, ALK4, ISOP, HNO3, H2O2, ACET, MEK, ALD2, RCHO, MVK, MACR, PMN, PPN, R4N2, PRPE, C3H8, CH2O, C2H6, N2O5, HNO4, MP • Photolysis • Fast -J (Wild et al.) • l=291-850nm • Computational Load • SGI 2000/16CPU/18 hrs walltime • 2 GB MEM • 8 CPU hrs/day • Restart Frequency • 15 Days

  3. Monthly Mean O3 OH March 1994 March 1994 Results are not good. Why?

  4. Daily Mean OH (January 1, 1994) Continuous Run Restart Run

  5. Daily Mean OH (January 2, 1994) Continuous Run Restart Run Restart Make Difference. Why? Restart Family not Species!

  6. Daily Mean O3 (January 1, 1994) Continuous Run Restart Run

  7. Daily Mean O3 (January 2, 1994) Continuous Run Restart Run

  8. Comments • It would be more reasonable to restart for species rather than for families. Hope GAMAP can be modified accordingly. • Make continuous run of the model if sufficient computational resource is available.