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- The first category, labelled realization_index (referred to with letter r), performs experiments which differ only in random perturbations of the initial conditions of the experiment. Comparing different realizations allow estimation of the internal variability of the model climate.
- The second category, labelled initialization_index (referred to with letter i), refers to variation in initialisation parameters. Comparing differently initialised output provides an estimate of how sensitive the model is to initial conditions.
- The third category, labelled physics_index (referred to with letter p), refers to variations in the way in which sub-grid scale processes are represented. Comparing different simulations in this category provides an estimate of the structural uncertainty associated with choices in the model design.
- The fourth category labelled forcing_index (referred to with letter f) is used to distinguish runs of a single CMIP6 experiment, but with different forcings applied.
Parameter listings
I AM WONDERING, IF THE ESGF LONG NAMES CAN BE ALSO INSERTED INTO THE TABLE? I THINK, IT WOULD BE USEFUL TO AVOID ANY CONFUSION! MAYBE WE CAN ALSO INDICATE THE TIME-INDEPENDENT FIELDS (THERE ARE QUITE A FEW). THE RED VARIABLES ARE THE ONES, WHAT WE DID NOT HAVE FOR CMIP5, SO I KEPT THE ORIGINAL ESGF NAMES FOR THE TIME BEING (THE CDS TEAM MIGHT PROPOSE SOMETHING ELSE).
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CDS parameter name | Variable id | Long name | Units | 2m temperature | tas | Near-Surface Air Temperature | Kelvin | Maximum 2m temperature in the last 24 hours | tasmax | Daily Maximum Near-Surface Air Temperature | Kelvin | Minimum 2m temperature in the last 24 hours | tasmin | Daily Minimum Near-Surface Air Temperature | Kelvin | | Skin temperature | ts | Surface Temperature | Kelvin | | Mean sea level pressure | psl | Sea Level Pressure | Pa | | Surface pressure | ps | Surface Air Pressure | Pa | | 10m u component of wind | uas | Eastward Near-Surface Wind | m s-1 | | 10m v component of wind | vas | Northward Near-Surface Wind | m s-1 | | 10m wind speed | sfcWind | Near-Surface Wind Speed | m s-1 | | 2m relative humidity | hurs | Near-Surface Relative Humidity | 1 | | 2m specific humidity | huss | Near-Surface Specific Humidity | 1 | | Mean precipitation flux | pr | Precipitation | kg m-2 s-1 | | Snowfall | prsn | Snowfall Flux | kg m-2 s-1 | | Evaporation | evspsbl | Evaporation Including Sublimation and Transpiration | kg m-2 s-1 | | Eastward turbulent surface stress | tauu | Surface Downward Eastward Wind Stress | Pa | | Northward turbulent surface stress | tauv | Surface Downward Northward Wind Stress | Pa | | Surface latent heat flux | hfls | flux | hfls | Surface Upward Latent Heat Flux | W m-2 | | Surface sensible heat flux | hfss | Surface Upward Sensible Heat Flux | W m-2 | | Surface thermal radiation downwards | rlds | Surface Downwelling Longwave Radiation | W m-2 | Surface upwelling longwave radiation | rlus | Surface Upwelling Longwave Radiation | W m-2 | Surface solar radiation downwards | rsds | Surface Downwelling Shortwave Radiation | W m-2 | Surface upwelling shortwave radiation | rsus | Surface Upwelling Shortwave Radiation | W m-2 | TOA incident solar radiation | rsdt | TOA Incident Shortwave Radiation | W m-2 | | TOA outgoing shortwave radiation | rsut | TOA Outgoing Shortwave Radiation | W m-2 | | TOA outgoing longwave radiation | rlut | TOA Outgoing Longwave Radiation | W m-2 | | Total cloud cover | clt | Total Cloud Cover Percentage | 1 | | Air temperature | ta | Air Temperature | K | | U-component of wind | ua | Eastward Wind | m s-1 | | V-component of wind | va | Northward Wind | m s-1 | | Relative humidity | hur | Relative Humidity | 1 | | Specific humidity | hus | Specific Humidity | 1 | | Geopotential height | zg | Geopotential Height | m | | Surface snow amount | snw | Surface Snow Amount | kg m-2 | | Snow depth? | snd | Snow Depth | m | | Runoff | mrro | Total Runoff | kg m-2 s-1 | | Soil moisture content | mrsos | Moisture in Upper Portion of Soil Column | kg m-2 | | Sea-ice are percentage? | siconc | Sea-Ice Area Percentage (Ocean Grid) | 1 | | Sea ice thickness | sithick | Sea Ice Thicknesssithick | m | | Sea ice plus snow amount | simass | Sea-Ice Mass per Area | kg m-2 | | Sea ice surface temperature | sitemptop | Surface Temperature of Sea Ice | K | | Sea surface temperature | tos | Sea Surface Temperature | K | | Sea surface salinity? | sos | Sea Surface Salinity | 1e-3 | | Sea surface height above geoid | zos | Sea Surface Height Above Geoid | m | | Grid-cell area for atmospheric grid variables?? | areacello | Grid-Cell Area for Ocean Variables | m2 | | Sea area percentage? | sftof | Sea Area Percentage | % | | Grid-cell area for ocean variables?? | areacella | Grid-Cell Area for Atmospheric Grid Variables | m2 | | Capacity of soil to store water? | mrsofc | Capacity of Soil to Store Water (Field Capacity) | kg m-2 | | Percentage of grid cell occupied by land (including lakes)? | sftlf | Percentage of the Grid Cell Occupied by Land (Including Lakes) | % | | Land ice area percentage? | sftgif | Land Ice Area Percentage | 1 | | Orography | orog | Surface Altitude | m |
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Data Format
The CDS subset of CMIP6 data are provided as NetCDF files. NetCDF (Network Common Data Form) is a file format that is freely available and commonly used in the climate modelling community. See more details: What are NetCDF files and how can I read them
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CDS users will now be able to apply subsetting operations to CMIP6 datasets. This mechanism (the "roocs" WPS framework) that runs at each of the partner sites: CEDA, DKRZ and IPSL. The WPS can receive requests for processing based on dataset identifiers, a temporal range, a bounding box and a range of vertical levels. Each request is converted to a job that is run asynchronously on the processing servers at the partner sites. NetCDF files are generated and the response contains download links to each of the files. Users of the CDS will be able to make subsetting selections using the web forms provided by the CDS catalogue web-interface. More advanced users will be able to define their own API requests in the CDS Toolbox that will call the WPS. Output files will be automatically retrieved so that users can access them directly within the CDS.
How to use the subsetting tool
Walkthrough and screenshots need to be provided by CDS team
WE WILL HAVE TO UPDATE THIS PART ABOVE ONCE NEW PROCESSES (LIKE AVERAGING OR RE-GRIDDING WILL BE AVAILABLE)
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