Convection/CVTT updateConvection/CVTT update

• At Spring Meeting ....

• Switch to finite volume

• Switch to UW PBL/shallow convection

• Explore alternate deep convection– Donner, Emanuel, ?– New capabilities (microphysics, aerosols,

radiation link, chemistry)

• New large-scale clouds (PDF?)

• Help in transition to “single executable, ESMF, development of a dynamics interface”

Convection/TVTT UpdateConvection/TVTT Update

• Task Team AMWG/OMWG topics– Ocean Model Working Group

• Tropical instability Waves• Diurnal cycle of SST• less diffusive thermocline• higher resolution representations in upwelling

regions

– Atmosphere Model Working Group• deep convection• boundary layer• shallow cumulus• gustiness

Formation of Tropical Variability Formation of Tropical Variability Task TeamTask Team

• General announcement to CCSM– Very heartening response from local and remote

members of the community.– 30-40 responses total (10-20 locals)– How to organize and exploit remote

participants?– decision to start with locals

• meet approximately monthly• tackle shorter time scale biases first

(diurnal through seasonal annual)• defer ENSO till we see some beneficial signal on

shorter timescales

– Explore sensitivity to variations in process representation, even to detriment of other aspects of simulation

First TVTT CalculationsFirst TVTT Calculations

• Benchmark – new version of CLM (physics and substantial

recoding)– new version of CAM(FV, recoding of physics,

slight variations in resolution)– convective signatures essentially like CAM3

• First experiment – OMWG addition of TIW to ocean – no real change in transient activity, Double

ITCZ, etc– significant improvements to ocean

circulations

Next experiments on CAM sideNext experiments on CAM side

• A few minor issues with UW PBL scheme

Progress on Zhang – McFarlane Progress on Zhang – McFarlane parameterizationparameterization

• Modification to closure• www-cas.ucsd.edu/~zhang/ncar_diag/

cam3eul64x128_d50amip

Emanuel Scheme Emanuel Scheme