WACCM Meeting Notes

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WACCM Meeting Notes 23 October 2006, NCAR
Foothills Lab In attendance Richmond (HAO),
Marsh (ACD), Sassi (CGD), Tilmes (ASP/ACD),
Kinnison (ACD), Liu (HAO), Wang (HAO), Fischer
(CGD), Gettelman (ACD/CGD), Richter (CGD),
Matthes (ACD), Hagen (HAO), Garcia (ACD)
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• Matthes
• WACCM Simulations with solar cycle and prescribed
  QBO
• Perpetual Solar Max, Min. Perpetual Solar Max,
  Min w/ QBO EW for each.
• Time varying solar REF1 runs (CCMVal/WMO) 4x54
  yrs.
• Solar Proton Event
• Time varying solar cycle and QBO 1953-2062 2x2.5
  (100 years 2x2.5) solar cycle only solar cycle
  and QBO Modeled Solar Signal in Ozone Results
  from WACCM similar vertical structure to data
  with QBO (E) SOLARIS Workshop role of QBO in
  solar cycle important, role of observed SSTs?
  First intercomparison started.

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• Hagan
• Work with SOARS student (Hernandez) looking at
  Solar Min Perpetual QBO EW
• Looking at Tidal Variability in mesopause
  region including QBO affects diurnal amplitude
  of tides in mesopause region.

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• Tilmes
• Polar Chemical Ozone Loss
• Derive chemical ozone loss for antarctic from
  tracer-tracer correlations Antarctic looks okay,
  but arctic doesn't show much ozone loss. (Arctic
  vortex is too small and warm)
• WACCM 4x5 v. 1.9x2.5 runs difference PV
  gradients narrower in higher resolution run.
  (better related to observations, small ozone
  hole). Also changes temporal distribution of
  ozone loss. But Arctic O3 loss likelynot changed.

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• Kinnison
• MOZART3 paper (with WACCM1b met fields) tropics
  is too isolated. Kinnison JGR 2006 has chemistry
  description. Also, age of air is young in tropics
  (too fast circulation or less mixing). Affects
  peak ozone distribution (too little NOy yields
  too much ozone at peak).
• WACCM3 ozone recovery.
• WACCM3 shows speeding up of brewer dobson
  circulation with climate change.
• Future Offline WACCM with GEOS-5 met fields. Up
  to 0.25deg resolution. Run at 0.5 degree
  resolution with 106 species mechanism. Offline
  WACCM use met fields up to 50km, then let model
  take over May be very expensive.

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• Richter
• New ASII Chris Fischer developing a diagnostic
  package for WACCM right now focused on dynamics
  U, T, GWdrag, SAO, MSAO. Add ERA data
  Stratospheric warming diagnostic Beres GW
  paramterization as a namelist variable
• 2x2.5 v. 4x5 Momentum budget similar (EP flux
  divergence), winds similar. Lots of waves in
  upper atmosphere. Sensitive to time resolution (
  3hrly v. daily means).
• Strat warming diagnostics 4x5 is better than
  2x2.5 ! (stronger vortex with higher resolution?
  not tuned properly?) variability is larger with
  QBO-E and with SST variability

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• Gettelman
• Supersaturation experiments (Gettelman,
  Kinnison). Paper to be submitted (this week) to
  ACPD Results moderate effect, better tropopause
  annual cycle Small chemical effect, 1W/m2
  radiative forcing (3/4 clouds) No "water vapor
  feedback" in a coupled model. Polar Mesospheric
  Clouds (Merkel, Marsh, Gettelman)
• Comparing WACCM PMC parameterization to CARMA
  (detailed -microphysical model) Develop as a
  standard piece of WACCM (separate physics module)
• Upper Troposphere / Lower Stratosphere WACCM 91
  level model with 300m vertical resolution in
  UT/LS Extratropical UT/LS Pan (Use ref1 runs,
  also UTLS-WACCM) TTL (Gettelman, Birner,
  Fujiwara)
• CCMVal activities. WMO Report papers 2
  papers (Eyring et al 2006, 2007) CCMVal 2007
  Leeds, UK. (discuss scenarios for next runs).
  Diagnostic Proposal to NASA submission next
  week.
• Garcia
• Tiedtke scheme being put into WACCM (by
  Giorgetta)
• Liu
• Extending upper boundary from 140km to 500km.
  Meeting regarding how to do it. Do extension
  first and make it run. Then we will put in
  variable thermodynamic parameters. Mostly
  thermosphere part. Some further ionosphere
  development.
• How to get CGD people involved? How to maintain
  and make it transparent first maintain a
  separate package for upward extension of
  dynamical core. Then see if we can take the
  changes into the dynamical core.