Tuesday 17 November Buffet Lunch Plenary session (overviews of work at each institute) – 1.15 Radiation work at Reading (Hogan) – 1.30 Radiation developments in the UM (Manners) – 1.45 Microphysics in the UM (Wilkinson) – 2.00 Microphysics work at Reading (Westbrook) – 2.15 Cloud scheme developments in the UM (Morcrette) 2.30 Break – 3.00 Satellite-based model evaluation work at Reading (Delanoe) – 3.15 Comparing drizzle from CloudSat and models (Hawkness-Smith) – 3.20 Ground-based model evaluation work at Reading (Illingworth) – 3.35 A 1-D cloud/microphysics framework for model evaluation (Shipway) – 3.50 Work on clouds at ECMWF (Forbes) 4.10 Break Breakout sessions (GU10, 1L36, 1L49) – Microphysics, Model evaluation, Radiation 5.30 Close 6.30 Pub? Restaurant: Strada

Strada, 7.30

Wednesday 18 November Break-out groups wrap up their thoughts – GU10, 1L61, 1L Spokespeople present summary to the group Discussion – How we can evaluate future model developments (rather than present ones)? – Data issues and how we can work together towards papers etc Break Wrap up Catch-up time for other collaborations etc (approx) Close – Met Office staff not wishing to attend RMetS meeting leave – Possible lunch trip to Senior Common Room for the others RMetS meeting for those wishing to stay – "Dynamicists versus modellers - the growing divide?"

Radiation breakout McICA/Tripleclouds intercomparison – Have both coded up, need to make sure both use same variance and overlap assumption – Need on-line and off-line comparisons – can do both within model infrastructure but not ECMWF – Need off-line version of Met Office McICA (Action – Hill) – Need to avoid problems with running jobs at Met Office – JRP – Still waiting for combination of horiz inhomogeneity and decorrelation overlap to work... – Add latitudinal dependence to McICA – Could run ECMWF off-line code to compare with Tripleclouds, Met Office McICA

Characterizing sub-grid structure in models Use cloud scheme PDF to feed into radiation ECMWF (Jean-Jacques) – Radiation uses 2x2 dynamics grid, currently working on putting PDF of surface types into McICA – Waiting for cloud scheme modifications before can feed through to radiation – currently using “Standard McICA” – Has introduced Shonk latitudinal decorrelation fit Met Office (Peter Hill’s PhD) – Use information from PC2 Validation – Variance comparison with CloudSat-Calipso – could to both Met Office and ECMWF simultaneously

3D radiation Compare Hogan/Shonk scheme with “Tilted ICA” – Tilted ICA already in ECMWF, neglects leakage effects – Could add separate tilt for direct and diffuse Could 3D effects be the reason for a bias in the ECMWF model

K terms Met Office had input from Zhien Sun and Wenyi Zhong – New methods and tricks for gaseous overlap and continuum dependence – Problems in the stratosphere – New solar spectrum (Lean) seems to be better particularly UV – New continuum from CAVIAR – input into Edwards-Slingo via collab with Keith Shine (ACTION) – FSCK into E-S via new spectral files ECMWF – Change to hPa lid? Currently 0.01 hPa, for satellite interpretation of weighting functions that peak high (but non-LTE problems), and QBO mis-representation – Stratopause errors up to 15 K, partly corrected with better distribution of trace gases (also gravity wave drag) – Continuum updates from CAVIAR via RRTM