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WACCM Meeting 2 June 2005

WACCM Meeting 2 June 2005. State of the WACCM: June 2005. WACCM 3 status Summary of current research projects Other activities Release of WACCM3 Computing resources Some details on current work Q & A. Model Status. WACCM, version 3 (WACCM3) completed March 2005

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WACCM Meeting 2 June 2005

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  1. WACCM Meeting2 June 2005

  2. State of the WACCM: June 2005 • WACCM 3 status • Summary of current research projects • Other activities • Release of WACCM3 • Computing resources • Some details on current work • Q & A

  3. Model Status • WACCM, version 3 (WACCM3) completed March 2005 • Tests for 1995 conditions show “realistic” climatology • Issues regarding horizontal resolution will impact applications (more on this later) • Current research projects • – “Retrospective” (1950-2003) simulation (GHG effects, trends, etc.) • – Effects of solar variability (Smax vs. Smin fixed conditions) • – Others (Hanli Wu, Andrew Gettelman, Yaga Beres, …) • MARS WACCM? Proposal by CU to study atmospheric chemistry on Mars (Toon et al.) – HAO involvement?

  4. Release of WACCM3 • WACCM3 is fully interactive throughout • – Aurora/ion code, EUV, ion drag and Joule heating • – More efficient LUT for photolysis calculations • – revised SAD code for heterogeneous chemistry • – extended, improved b.c. datasets • WACCM3 code has been merged into latest version of the Community Atmosphere Model (CAM_3.1x) • –Found error in development version of the model • (thanks, Byron) • After further testing, WACCM3 will be released for community use (sometime in 2005)

  5. Computing Resources • WACCM3 requires ~150 Bluesky GAUs/year (~430 CPU hours, or ~9 wallclock hours on 2x32 processors) • WACCM allocation is ~9000 GAU/mo on CSL + 5000 GAU/mo on ESSL (the latter up for review after June –will submit proposal) • “Trends” simulation requires 3 realizations x 50 years x 150 GAU/yr = 22,500 GAUs => our CSL resource base for 2.5 months! • It is impractical to run WACCM at > 4x5° resolution at NCAR for climate studies. We are for resources elsewhere (Earth Simulator, NASA/Ames, etc.) • Will lobby NCAR director for immediate augmentation to Bluesky. Need to be involved in “next generation” procurement (2006)

  6. Other Activities • Seminar on FV method by Christiane Jablonowski (SCD) (May 31) • Present results of “trends” run at IAGA Assembly (Toulouse, July) and IAMAP (Beijing, August) (Garcia and Kinnison, respectively) • Present results of Smax/Smin runs at IAGA (Katja Matthes, Dan Marsh) • Present work on 2-day wave forcing (Yaga Beres) at AMS Middle Atmosphere meeting (Boston, June) • Participation in SPARC’s CCM Validation project (Kinnison) • Several papers appeared, in press, and in preparation • New, upgraded version of geov viewer available (lots of new functionality, bug fixes) • Need to update WACCM web site!

  7. Some details…

  8. WACCM3 Climatology: U and T for Jan and Jul

  9. WACCM3 Climatology: H2O tape recorder, O3 column

  10. WACCM3 Resolution issues Idealized baroclinic wave test case; Coarse resolution does not capture baroclinic evolution! From C. Jablonowski (SCD) http://www.scd.ucar.edu/css/staff/cjablono/amr.html#amr_resources

  11. Impact on N.H. midwinter sudden warmings? 4x5° run on Bluesky 2x2.5° run on Earth Simulator 1.x1.25° run on Earth Simulator Temperature@ 10 hPa 70N (From F. Sassi) => 4x5° unsuitable for “annular mode” coupling studies

  12. Trends Run: H2O (equator, deseasonalized) solar cycle influence impact of CH4 + ENSO impact of ENSO

  13. Trends Run: T (global mean, deseasonalized) T at 1 mb T at 10 mb 1 K T at 85 mb

  14. Trends Run: Global energy balance (smoothed, deseasonalized) 0.006 K/d 50 km -0.006 K/d 0.02 K/d 100 km -0.02 K/d

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