WACCM Meeting 2 June 2005

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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)

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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 gt our CSL
  resource base for 2.5 months!
• It is impractical to run WACCM at gt 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)

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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 SPARCs 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!

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Some details
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WACCM3 Climatology U and T for Jan and Jul
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WACCM3 Climatology H2O tape recorder, O3 column
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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.htm
lamr_resources
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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_at_ 10 hPa 70N
(From F. Sassi)
gt 4x5 unsuitable for annular mode coupling
studies
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Trends Run H2O (equator, deseasonalized)
solar cycle influence
impact of CH4 ENSO
impact of ENSO
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Trends Run T (global mean, deseasonalized)
T at 1 mb
T at 10 mb
1 K
T at 85 mb
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Trends Run Global energy balance (smoothed,
deseasonalized)
0.006 K/d
50 km
-0.006 K/d
100 km
0.02 K/d
-0.02 K/d