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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WACCM Meeting 2 June 2005

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Waccm meeting 2 june 2005

WACCM Meeting2 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


Waccm meeting 2 june 2005

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?


Waccm meeting 2 june 2005

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)


Waccm meeting 2 june 2005

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)


Waccm meeting 2 june 2005

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!


Waccm meeting 2 june 2005

Some details…


Waccm meeting 2 june 2005

WACCM3 Climatology: U and T for Jan and Jul


Waccm meeting 2 june 2005

WACCM3 Climatology: H2O tape recorder, O3 column


Waccm meeting 2 june 2005

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


Waccm meeting 2 june 2005

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


Waccm meeting 2 june 2005

Trends Run: H2O (equator, deseasonalized)

solar cycle influence

impact of CH4

+ ENSO

impact of ENSO


Waccm meeting 2 june 2005

Trends Run: T (global mean, deseasonalized)

T at 1 mb

T at 10 mb

1 K

T at 85 mb


Waccm meeting 2 june 2005

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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