Dataset
HadCM3Q PRECIS data generated for the QUMP (Quantifying Uncertainty in Model Predictions) Project using IPCC's SRES A1B future emissions scenario.
Abstract
This PRESCIS dataset (Providing REgional Climates for Impacts Studies) is output data from the HadCM3Q GCM ensemble, which used the SRES A1B scenario (see the Special Report on Emissions Scenarios (SRES) www.ipcc.ch/pdf/special-reports/spm/sres-en.pdf), spanning December 1949 to November 2099. The data are split up according to their runid and then by their stash code.
The Quantifying Uncertainty in Model Predictions (QUMP) research theme aims to provide probabilistic predictions of future climate. These are based on large ensembles of simulations of equilibrium and time-dependent change, carried out by perturbing poorly constrained parameters controlling key physical and biogeochemical processes in the HadCM3 coupled ocean-atmosphere global climate model. Further ensembles of regional climate simulations at high resolution, driven by boundary conditions obtained from the HadCM3 ensemble, allow the specification of probabilistic predictions at spatial scales suitable for climate impact studies. These experiments allow quantification of the effects of earth system modelling uncertainties and internal climate variability on feedbacks likely to exert a significant influence on twenty-first century regional climate.
The diagnostics are either on the horizontal 'pressure grid' or the horizontal 'wind grid'. For the 'wind grid' an Arakawa B grid layout is used, in which wind variables are offset from all other variables (said to be on the 'pressure grid') by half a grid box in both directions. The 'wind grid' has the same number of points in the east-west direction as the 'pressure grid', but one less in the north-south direction.
Some files are available as monthly means and some are available as daily means.
Each daily mean file contains 360 fields (one field per day for a year in the 360 day calendar used by HadCM3Q). Each monthly mean tarball contains files with one field (one field for a month covering the span of December 1949 to November 2099).
Tables of information about the runids and stash codes can be found in the PRECIS_Data_Readme stored alongside the fileset.
Details
| Previous Info: |
No news update for this record
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| Previously used record identifiers: |
No related previous identifiers.
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| Access rules: |
Restricted data: please submit an application using the REQUEST ACCESS link for access.
Use of these data is covered by the following licence(s): https://artefacts.ceda.ac.uk/licences/missing_licence.pdf When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record. |
| Data lineage: |
Data from the UK Met Office Hadley Centre. Dataset directory structure was reordered by CEDA staff in November 2023 to place experiment runs within a directory of their associated experiment. |
| Data Quality: |
Model data.
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| File Format: |
Data are PP formatted
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Related Documents
Process overview
| Title | Hadley Centre Hadley Centre Coupled Model Version 3 |
| Abstract | The Hadley Centre Hadley Centre Coupled Model Version 3 was developed from the earlier HadCM2 model in the period 1997-2000. Various improvements were applied to the 19 level atmosphere model and the 20 level ocean model and as a result the model requires no artificial flux adjustments to prevent excessive climate drift. The atmosphere and ocean exchange information once per day, heat and water fluxes being conserved exactly. The main differences from the previous HadCM2 model are a significantly more sophisticated radiation scheme; the inclusion of the direct impact of convection on momentum; and the inclusion of a new land surface scheme that includes a better representation of evaporation, freezing and melting of soil moisture. It improved on the resolution available from previous Hadley Centre models and included support for interactive couplings between the atmosphere and ocean and the biosphere, atmospheric chemistry, the sulphur cycle and atmospheric aerosols. The HadCM3 model was used by the Hadley Centre to provide input for the IPCC Third Assessment Report. |
| Input Description | None |
| Output Description | None |
| Software Reference | None |
- units: m s-1
- long_name: 10 METRE WIND SPEED M/S
- units: m s-1
- long_name: 10 METRE WIND U-COMP
- units: m s-1
- long_name: 10 METRE WIND V-COMP
- units: kg m-2 s-1
- long_name: CONVECTIVE RAINFALL RATE KG/M2/S
- units: kg m-2 s-1
- long_name: CONVECTIVE SNOWFALL RATE KG/M2/S
- units: m
- long_name: GEOPOTENTIAL HEIGHT: PRESSURE LEVELS
- units: W m-2
- long_name: INCOMING SW RAD FLUX (TOA): ALL TSS
- units: kg m-2 s-1
- long_name: LARGE SCALE RAINFALL RATE KG/M2/S
- units: kg m-2 s-1
- long_name: LARGE SCALE SNOWFALL RATE KG/M2/S
- units: W m-2
- long_name: NET DOWN SURFACE LW RAD FLUX
- long_name: NET DOWN SURFACE SW FLUX: SW TS ONLY
- units: W m-2
- units: W m-2
- long_name: OUTGOING LW RAD FLUX (TOA)
- units: W m-2
- long_name: OUTGOING SW RAD FLUX (TOA)
- units: Pa
- long_name: PRESSURE AT MEAN SEA LEVEL
- units: Pa
- long_name: PSTAR AFTER TIMESTEP
- long_name: RELATIVE HUMIDITY AT 1.5M
- long_name: RELATIVE HUMIDITY ON PRESSURE LEVELS
- units: kg m-2
- long_name: SOIL MOISTURE CONTENT
- units: kg kg-1
- long_name: SPECIF HUM;P LEVS;U GRID. USE MACRO
- units: kg kg-1
- long_name: SPECIFIC HUMIDITY AT 1.5M
- units: kg m-2 s-1
- long_name: SUB-SURFACE RUNOFF RATE KG/M2/S
- units: kg m-2 s-1
- long_name: SURF & BL TOTL MOISTURE FLUX KG/M2/S
- units: W m-2
- long_name: SURFACE & B.LAYER HEAT FLUXES W/M2
- units: kg m-2 s-1
- long_name: SURFACE RUNOFF RATE KG/M2/S
- units: K
- long_name: SURFACE TEMPERATURE AFTER TIMESTEP
- units: K
- long_name: TEMPERATURE AT 1.5M
- units: K
- long_name: TEMPERATURE ON PRESSURE LEVELS
- long_name: TOTAL CLOUD AMOUNT IN LW RADIATION
- units: 0-1
- units: W m-2
- long_name: TOTAL DOWNWARD SURFACE SW FLUX
- units: kg m-2 s-1
- long_name: TOTAL PRECIPITATION RATE KG/M2/S
- units: m s-1
- long_name: U COMPNT OF WIND ON PRESSURE LEVELS
- units: m s-1
- long_name: V COMPNT OF WIND ON PRESSURE LEVELS
- units: Pa
- long_name: atmospheric hybrid sigma-pressure 'A' coefficient
- long_name: atmospheric hybrid sigma-pressure 'B' coefficient
- long_name: reference pressure value for atmospheric hybrid sigma-pressure coordinates
Co-ordinate Variables
Temporal Range
1949-12-01T00:00:00
2099-11-01T00:00:00
Geographic Extent
90.0000° |
||
-180.0000° |
180.0000° |
|
-90.0000° |