waccm meeting 2 june 2005
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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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slide2

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
slide3

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?
slide4

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)
slide5

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)
slide6

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!
slide10

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

slide11

Impact on N.H. midwinter sudden warmings?

4x5° run on Bluesky

2x2.5° run on Earth Simulator

1.x1.25° run on Earth Simulator

[email protected] 10 hPa 70N

(From F. Sassi)

=> 4x5° unsuitable for “annular mode” coupling studies

slide12

Trends Run: H2O (equator, deseasonalized)

solar cycle influence

impact of CH4

+ ENSO

impact of ENSO

slide13

Trends Run: T (global mean, deseasonalized)

T at 1 mb

T at 10 mb

1 K

T at 85 mb

slide14

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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