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PRECIS Data at BADC

Download HadCM3Q(0-16) global model data from the BADC

You can now download HadCM3Q(0-16) global model data from the British Atmospheric Data Centre (BADC). You will need to register for a BADC account and then apply for access to the restricted data set. For access click on the Data Tab, then Dataset Index, go to Climate Impacts LINK Project, click on Apply for Access and then follow the instructions. When you have access please click here.

About the BADC data

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 data at  /badc/hadcm3/data/PRECIS/ are the output data from the HadCM3Q GCM ensemble, which used the SRES A1B scenario (see the Special Report on Emissions Scenarios (SRES)), spans December 1949 to November 2099, split up according to their runid and then by their stash code. A description of the runids and stash codes can be found below.

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.

For more information about the structure of PP files please read Appendix D and E of the PRECIS Technical Manual 1.9.2 PRECIS Technical Manual (PDF, 1 MB) . 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 a files with one field (one field for a month covering the span of December 1949 to November 2099.

To un-tar the files please use the following command:

tar xvf [file].tar

eg.

tar xvf aenwh_08020.tar

Please find below tables of information about the runids and stash codes.

Run IDs

aenwh HadCM3Q0
aexsrHadCM3Q1
aexsb  HadCM3Q2
aexsa HadCM3Q3
aexscHadCM3Q4
aexsdHadCM3Q5
aexshHadCM3Q6
aexsf HadCM3Q7
aexsj HadCM3Q8
aexsiHadCM3Q9
aexskHadCM3Q10
aexsm  HadCM3Q11
aexsnHadCM3Q12
aexsoHadCM3Q13
aexsl HadCM3Q14
aexsp HadCM3Q15
aexsq HadCM3Q16

Monthly Files Stash Codes

1Surface PressurePaSOP
24Surface (Skin) TemperatureKSOP
1201Net Down Surface SW FluxW/m**2SOP
1207Incoming SW Flux at TOAW/m**2MSLP
1208Outgoing SW Flux at TOAW/m**2MSLP
1235Total Downward Surface SW FluxW/m**2SOP
2201Net Down Surface LW FluxW/m**2SOP
2204Total Cloud Amount (0<=x<=1)---MSLP
2205Outgoing LW Flux at TOAW/m**2MSLP
3217Surface & BL Heat FluxesW/m**2SOP
3223Surface & BL Moisture Fluxeskg/m**2/sSOP
3225Wind U-Component at 10 Metresm/sSOW
3226Wind V-Component at 10 Metresm/sSOW
3236Temperature at 1.5 MetresKSOP
3237Specific Humidity at 1.5 Metreskg/kgSOP
3245Relative Humidity at 1.5 Metres%SOP
3249Wind Speed at 10 Metresm/sSOW
4203Large Scale Rainfall Ratekg/m**2/sMSLP
4204Large Scale Snowfall Ratekg/m**2/sMSLP
5205Convective Rainfall Ratekg/m**2/sMSLP
5206Convective Snowfall Ratekg/m**2/sMSLP
5216Total Precipitation Ratekg/m**2/sMSLP
8208Available Soil Moisture Content in Root Zonekg/m**2SOP
8234Surface Runoff Ratekg/m**2/sSOP
8235Sub-Surface Runoff Ratekg/m**2/s0PaP
15201Wind U-Component (=U)m/s@W
15202Wind V-Component (=V)m/sW
15226Specific Humidity (=Q)kg/kg@W
16202Geopotential Height (=Z)mP
16203TemperatureK@P
16204Relative Humidity%@P
16222Pressure at Mean Sea LevelPaMSLP

Daily Files Stash Codes

1201Net Down Surface SW FluXW/m**2SOP
1235Total Downward Surface SW FluxW/m**2SOP
2201Net Down Surface LW FluxW/m**2SOP
2205Outgoing LW Flux at TOAW/m**2MSLP
3217Surface & BL Heat FluxesW/m**2SOP
3223Surface & BL Moisture Fluxeskg/m**2/sSOP
3225Wind U-Component at 10 Metresm/sSOW
3226Wind V-Component at 10 Metresm/sSOW
3236Temperature at 1.5 MetresKSOP
3245Relative Humidity at 1.5 Metres%SOP
3249Wind Speed at 10 Metresm/sSOW
5216Total Precipitation Ratekg/m**2/sMSLP
8208Available Soil Moisture Content in Root Zonekg/m**2SOP
15201Wind U-Component (=U)m/s*W
15201.instWind U-Component (=U)m/sIW
15202Wind V-Component (=V)m/s*W
15202.instWind V-Component (=V)m/sIW
15226Specific Humidity (=Q)kg/kg*W
16202Geopotential Height (=Z)m#P
16203TemperatureK@P
16204Relative Humidity%~P
16222Pressure at Mean Sea LevelPaMSLP

Key to Stash Codes

WWind Grid
PPressure Grid
SOSurface Only
MSLMean Sea Level
ISix hourly instantaneous values on 850 and 300 hPa pressure levels
~Values on 500 HPa pressure level only
#Values on 850, 700 and 500 hPa pressure levels
*Values on 1000, 925, 850, 700, 600, 500, 400, 300 and 200 hPa pressure levels
@Values on 1000, 925, 850, 700, 600, 500, 400, 300, 200, 100, 70, 50, 30, 20 and 10 hPa pressure levels
Last Updated: 17 June 2011