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Opening thoughts on AMWG meeting Phil Rasch Overview of Meeting –Day 1: CAM development; PBL & Shallow Convection, Aerosols, Microphysics Deep Convection; Exploring CAM3 behavior –Day 2: Exploring CAM3 behavior CAM3/CCSM3 in relationship to other Climate Models –Day 3 Morning: Insights into Dynamical formulations Data assimilation SciDAC Next Steps

What is missing from the agenda WACCM Chemistry Cloud fraction, subgrid variability, cloud overlap, independent column approximations Gravity Wave Drag Flow dependent horizontal diffusion (e.g. Smagorinsky) Microphysics within vigorous convection Radiation Extra-terrestrial CAM New grids/numerical techniques for CAM –HOMME –Conservative remapping See for developments in these areas (contact Andrew Gettelman for passwords if you need one)

What is happening in other components of CCSM Software engineering efforts relevant to the development of CCSM –Subversion repository maturing –Sequential CCSM development (significant refactoring of CAM as first stage. No re-griding yet) –Removed dependencies within CAM assuming rectangular lat/lon grids (opens path for cubed sphere and triangular grids) –Coupling Frameworks: We plan to exploit two frameworks Much of the development has been done using MCT Nearing complete ESMF capability. Stage 1 effectively complete. Stage 2 begins. –Unification of FV core with NASA GEOS-5 modeling effort –Fixed OMEGA (pressure velocity) in CAM –Much improved regression testing procedures for CAM, constantly evolving, exercise new functionality –Database of experiments and control simulations (currently most relevant for CCSM rather than CAM) –Tropospheric MOZART/Chem, WACCM, UW Physics, Emanuel convection, Offline CAM & CGD aerosols on development trunk as options –Massively parallel issues [I/O, dynamical core, memory (particularly lookup tables in chemistry)]

What is happening in other components of CCSM part II Exploratory –Regional Cloud Resolving Model (NRCM, WRF run in a channel driven by either analyses or CCSM) The path forward –New land model (revisions to hydrology) –Chemistry [w/aerosols (simple and more complex)] –More Biogeochemistry (Carbon, Nitrogen cycles) C 4 MIP -> C-LAMP (compare CASA, CN, IBIS w/in SciDAC) –Substantially revised ocean model (POP-2 code, vertical resolution, horizontal viscosity, GM modifications, new advection) –New Sea Ice Model (CSIM -> CICE4, ridging, albedo, meltponds) Feb 27-28

Interim model (CCSM3.5) Will combine all model component improvements available as of about 1 March, 2007 Goal to allow exploration of Carbon Cycle early in the evolution of CCSM4 (spinups of as much as a thousand years are necessary to equilibrate biogeochemical models) Strategy is starting to evolve to produce controls for the CC experiments –Balance CCSM at TOA at 1870 conditions –Run model forward in time with transient forcing, look at present day simulation to make sure it looks like today’s planet earth. –Iterate until physical system acceptable –Start BGC simulations with CCSM 3.5 Improvements continue within components at least until early 2008 (phase II) In 2008 we put models together again and start phase III “ test, finalize, and thoroughly understand the CCSM4 that includes the new physical components, the final carbon cycle component, aerosol indirect effects, and the new land ice component. Includes obtaining the very long spinups required for the biogeochemistry and land ice components, and determining the final parameter settings for the CCSM, such as the sea ice albedos, etc. “ Goal is to have a model we have some confidence in by early 2009.

Questions for AMWG Are we missing a discussion of important things that should be considered for CAM itself (e.g. resolution issues) Can we leverage our current efforts to move faster in improving CAM? What metrics should we be focussing upon? Do we want a “social outing” this evening? –Pub (bottom of hill) –Tandoori Grill (bottom of hill) –The “Med” (downtown) Open Discussion / Questions?