Changes from modelE (AR4) to modelE (AR5) ========================================= - Higher resolution versions available (2x2.5) - Cubed Sphere dynamics and grid (C90) resolution - Multiple changes to cloud schemes - Incorporation of Menon et al aerosol/cloud microphysics - Full atmosphere gas phase chemistry - Ocean biology and full carbon cycle - Coupler layer for different ocean grids - Fuller diagnostic output (note these are a very condensed summary of the differences). Changes from modelE-2-3-4+ to modelE1 (or 3.0) (AR4) ==================================================== - big expansion of tracer coding - relative humidity sensitivity of aerosol optical thickness - new cloud micro-physics - better separation of convective and stratiform cloud - more interactions between tracer fields and radiation - NUDGING facility for trying to reproduce field experiments - full use of atmospheric turbulence - improved historical fields for ozone, aerosols - new conductance scheme for evapo-transpiration - extended sub-daily diagnostics - new diag Hdirun for time series of all fields over last month for selected grid boxes - option to run with smaller physics time step Changes from modelE-2-3 to modelE-2-3-4+ ======================================= - new conductance scheme option for land surface - preliminary incorporation of wet and dry deposition for gases and aerosols - angular momentum conservation for UV filter and GW drag - better modularisation of snow model - improved option for sea ice albedo (Hansen) - minor bug fixes and diagnostic improvements Major changes from version modelE-2-1 to modelE-2-3 =================================================== - Glacial melt (icebergs) now available as input into ocean - time varying crop fraction possible - monthly files for the CH4 oxidation into stratosphere - Further extensions to sub-daily diagnostics to cover all geopotential heights, temperatures and velocities, and tropopause height - New scoring statistic for comparsion to observations - Tested versions at 2x2.5 and 8x10 horizontal resolutions - More options in stratospheric drag formulation. - snowice formation now an option - zenith angle dependence for all snow/ice albedos - New ISCCP cloud optical depth/height histograms diagnostics. - water tracer code in soils - orbital parameter calculations based on paleo-year - surface velocities (ice, ocean) no used as input into surface boundary conditions. Major changes from version modelE-2-0-1 to modelE-2-1 ===================================================== - Qflux model now has option to include ice advection. - new options for controling cloud optical thickness - Energy conservation now guaranteed - New physics for deciding on phase of precip (i.e. how quickly super-cooled precip turns to ice) - New coding for ground hydrology - Small corrections for q-flux/seaice modules - Improved conservation diagnostics (including new text demonstrating conservation properties "conserv.txt") - Extension to sub-daily diagnostics to include cloud cover (low, mid, high) and relative humidity values. - Enhanced diagnostics of cloud radiative properties - Code is now compatible with PGI (Portland Group) compiler. Major changes from version modelE-2-0 to modelE-2-0-1 ===================================================== - Minor fixes to almost all components - New options for snow-age definitions, Sea-ice and SST cycling. - netcdf output now fully functional - Changes to makefiles for compilation using Linux compilers (Absoft + Lahey/Fujitsu) Major changes from version modelE-1-3-3 to modelE-2-0 ===================================================== Atmospheric Model: - Advection of Q now done outside dynamics loop - New sea ice albedo scheme (pudlling and snowage replaced with prognostic melt-pond fraction and wet/dry snow flag). - solar radiation penetration through sea ice now wavelength dependent - the basal fluxes between the ice and ocean are calculated using a new turbulence scheme. New routines UNDERICE, iceocean, icelake. - parallelisation directives for atmospheric model - changes to boundary layer cloud specifications - improvements to turbulence calculations (including a fix of a bug that caused problems when the first layer was too thin) - fix for mass fluxes over topography to prevent unrealistic precipitation hotspots - Multiple vertical resolutions available - new interface for radiation to allow more control of greenhouse gases, aerosols etc. from rundeck. - Adjustable input of CH4 related stratospheric water vapour - Numerous parameters for the gravity wave drag adjustable from the rundeck Coupled Model: - Gary's ocean model now fully coupled (plug and play option) - Ice dynamics now a completely separate module - Ocean heat transport diagnostic in printout - much more extensive ocean diagnostics Tracer code: - tracer code for air mass and water mass tracers (uses preprocessing directives set from the run deck) - wet/dry deposition code for general tracers (aerosols, particles, water and soluble gases) - multiple example tracers pre-coded Diagnostics: - Numerous errors in diagnostic printout fixed - Re-arrangement of budget pages to provide more relevant info. - Conservation diagnostics for AM and KE actually add up. - Configurable daily and sub-daily diagnsotic output for selected quantities Run Envrionment: - .modelErc file in home directory to enable a configuration to set up a local distribution on any machine - automatic compilation of online documentation for any particular configuration. - new 'lock' file method for preventing un-intended writing over of files. - MUST USE COMMANDS 'runE' and 'sswE' to start and stop model - automatic re-starting with smaller timestep for some crashes (set from initial rundeck) Major Changes from Model II' to modelE-1-3-3 ============================================ Variable name changes/re-definitions: - FDATA replaced with FLAND/FOCEAN/FLICE/FLAKE/FEARTH - GDATA replaced with: SNOWI,HSI (sea ice) SNOWE,TEARTH,WEARTH,AIEARTH,SNOAGE (earth) TLANDI, SNOWLI (land ice) - ODATA replaced with: TOCEAN, RSI and MSI (TLAKE over land) - Second order moments are condensed to one array. Whether the quadratic or linear upstream scheme is required now only requires a change in the QUSCOM/QUSDEF modules. Multiple advection routines replaced with one general purpose routine. - Arrays that are used for column physics only are now written with the column index first (i.e. L,I,J) for performance improvement - Ground temperatures for SURFCE/RADIA and PBL are now saved in the GTEMP array. - parameters for both the model and all sub modules are now saved in a parameter block that is of variable length and self-documenting (replacing JC/RC in the old code). Structural and Fortran 90 related changes - Common blocks replaced with physics-related MODULEs - Model common block (i.e. BB399xyz.COM) now MODEL_COM MODULE - physical constants all defined in CONSTANT module - Each physical submodule (ie. ice, snow, ocean, land, land ice, clouds,etc.) has it's own fortran MODULE. As far as possible, different modules interact only through fluxes. - initialisation of each sub-module is now in init_PHYS (if required) - daily processes moved into daily_PHYS (if needed) - Many errors in diagnostics and in the seaice/Qflux model corrected - lakes are seperated from ocean variables/code. - sea ice now seperated from ocean/lakes code. All fluxes are now passed. - Explicit use of B-grid velocity points is now implicit. Diagnostics - pdE (used to print diagnostics) is now just an alternate entry to the model, and thus cannot be out of date. - diagnostic arrays now addressed by name, not number Input/Output - Named files in rundeck instead of unit numbers - FILEMANAGER module to allocate unit numbers - input/output decentralized to io_PHYS routines for each PHYS submodule Runtime environment - compiling/linking/setup now under control of an automatic makefile process - NAMELIST input: TAUI/E replaced with YEARI/E,MONTHI/E,DATEI/E,HOURI/E (alt. IHOURE) NDPRNT/NDZERO replaced with NIPRNT and NMONAV DT related variables such as NRAD etc, now relate to DTsrc (=1hour) SIGE setting replaced with PLTOP (pressure at the top of the level) - SIGE is now computed. U00 replaced with U00wtr and U00ice (separate numbers for ice and water clouds) - Local parameters are now stored in the parameter database which mainly supplants the NAMELIST input. New physics - Sea ice over the ocean is now formed at TFO (=-1.8 deg). - Solar radiation now penetrates into (and through) the sea ice. - Sea ice salinity is now a prognostic variable (though not yet fully coupled to the thermodynamics). - lake temperature/ice cover are now predicted using a two layer energy/mass conserving model. - Turbulence can now be applied throughtout the atmosphere (ATURB.f).