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Poles Apart: Why has Antarctic sea ice increased and why don't coupled climate models reproduce observations, climate model data

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Citable
Publication Date: 2017-08-07
DOI Publication Date: 2017-08-25
Download Stats: last 12 months
Dataset Size: 359 Files | 254GB


Data produced in support of the NERC project Poles Apart (2014 - 2017) that investigated the atmospheric drivers of changes in surface wind forcing using the UK Chemistry and Aerosols (UKCA) model.

Ten HadGEM3 model simulations were undertaken. Monthly model data was taken from the final 30 years of each simulation and a number of variables of interest, e.g. temperature and precipitation were extracted and analysed.

The temporal range for the perturbed simulations is 1980-2013, and the control simulations are valid between 1841-1900.

See the detailed experiment documentation for the Unified Model experiment ids and their corresponding description (these have been used to organise the data).

Citable as:  Pope, J. (2017): Poles Apart: Why has Antarctic sea ice increased and why don't coupled climate models reproduce observations, climate model data. Centre for Environmental Data Analysis, 25 August 2017. doi:10.5285/acf1f55cd92a41fa9a97949b2066ad07.
Abbreviation: Not defined
Keywords: Climate, Ozone, GHG, Aerosol, HadGEM3, UKCA


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

UK Chemistry and Aerosol (UKCA) climate model data extracted using Convsh and converted to NetCDF. The data were provided by the Poles Apart project from the British Antarctic Survey and were passed to CEDA for archival.

Data Quality:
The data have not been quality controlled by CEDA.
File Format:
The data are NetCDF formatted.

Process overview

This dataset was generated by the computation detailed below.

Poles Apart computation


The UK Met Office third generation Hadley Centre Global Environment Model (HadGEM3) run in atmosphere only mode (prescribed sea ice and sea surface temperatures) coupled to the United Kingdom Chemistry & Aerosols (UKCA) model. HadGEM3 was run using the GA4.0 and GL4.0 physics configurations (See Walters et al., 2014, Geo. Mod. Dev)

Input Description


Output Description


Software Reference


  • units: W m-2
  • var_id: field259
  • long_name: Atmospheric energy correction (from UM 3.3)
  • names: field259, Atmospheric energy correction (from UM 3.3)
  • units: W m-2
  • var_id: field207
  • standard_name: surface_upwelling_shortwave_flux_in_air_assuming_clear_sky
  • long_name: Clear-sky flux (type II) solar up
  • names: field207, surface_upwelling_shortwave_flux_in_air_assuming_clear_sky, Clear-sky flux (type II) solar up
  • units: W m-2
  • var_id: field200
  • standard_name: toa_incoming_shortwave_flux
  • long_name: Downward solar
  • names: field200, toa_incoming_shortwave_flux, Downward solar
  • units: m
  • var_id: ht
  • standard_name: geopotential_height
  • long_name: Height
  • names: ht, geopotential_height, Height
  • units: level
  • long_name: Hybrid height
  • var_id: hybrid_ht
  • names: Hybrid height
  • units: W m-2
  • var_id: olr
  • standard_name: toa_outgoing_longwave_flux
  • long_name: IR up
  • names: olr, toa_outgoing_longwave_flux, IR up
  • units: W m-2
  • var_id: lh
  • long_name: Latent heat flux
  • names: Latent heat flux, lh
  • long_name: Layer liquid cloud amount in layers
  • var_id: field1425
  • names: Layer liquid cloud amount in layers, field1425
  • units: kg kg-1
  • long_name: Mass Mixing Ratio
  • var_id: mmr
  • names: Mass Mixing Ratio, mmr
  • units: level
  • var_id: msl
  • long_name: Mean sea level
  • names: Mean sea level
  • units: Pa s-1
  • var_id: omega
  • standard_name: lagrangian_tendency_of_air_pressure
  • long_name: Omega (= dp/dt)
  • names: omega, lagrangian_tendency_of_air_pressure, Omega (= dp/dt)
  • units: m2 m-3
  • long_name: Particle Area Density
  • var_id: pad
  • names: Particle Area Density, pad
  • units: mbar
  • long_name: Pressure
  • var_id: p
  • standard_name: air_pressure
  • names: air_pressure, Pressure
  • standard_name: relative_humidity
  • long_name: Relative humidity
  • var_id: rh
  • names: Relative humidity, relative_humidity, rh
  • units: W m-2
  • var_id: sh
  • standard_name: surface_upward_sensible_heat_flux
  • long_name: Sensible heat flux
  • names: Sensible heat flux, sh, surface_upward_sensible_heat_flux
  • units: kg m-2 s-1
  • var_id: snow
  • standard_name: snowfall_flux
  • long_name: Snowfall rate
  • names: snow, snowfall_flux, Snowfall rate
  • units: m s-1
  • standard_name: northward_wind
  • var_id: v
  • long_name: Southerly component of wind v
  • names: northward_wind, v, Southerly component of wind v
  • units: kg kg-1
  • long_name: Specific humidity q
  • var_id: q
  • standard_name: specific_humidity
  • names: q, Specific humidity q, specific_humidity
  • units: level
  • var_id: surface
  • long_name: Surface
  • names: Surface
  • units: K
  • long_name: Temperature T
  • var_id: temp
  • standard_name: tropopause_air_temperature
  • names: temp, Temperature T, tropopause_air_temperature
  • units: level
  • var_id: toa
  • long_name: Top of atmosphere
  • names: Top of atmosphere
  • long_name: Total precipitation rate
  • units: kg m-2 s-1
  • var_id: precip
  • standard_name: precipitation_flux
  • names: Total precipitation rate, precip, precipitation_flux
  • units: kg m-2 s-1
  • var_id: rain
  • standard_name: rainfall_flux
  • long_name: Total rainfall rate
  • names: rain, rainfall_flux, Total rainfall rate
  • var_id: unspecified
  • long_name: Unspecified
  • names: Unspecified
  • units: W m-2
  • var_id: field201
  • long_name: Upward solar
  • names: field201, Upward solar
  • units: m s-1
  • standard_name: eastward_wind
  • var_id: u
  • long_name: Westerly component of wind u
  • names: eastward_wind, u, Westerly component of wind u
  • units: level
  • var_id: pseudo
  • long_name: pseudo
  • names: pseudo

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • long_name: latitude
  • var_id: lat
  • names: latitude
  • units: degrees_east
  • standard_name: longitude
  • long_name: longitude
  • var_id: lon
  • names: longitude
  • standard_name: time
  • var_id: t
  • long_name: t
  • names: time, t
Temporal Range
Start time:
End time:
Geographic Extent