Introduction

This page provides a data catalogue of the parameters provided as part of the NextGEMS data portfolio. See also the Climate DT Phase 1 data catalogue.

This data can be retrieved using the polytope service via the DestinE Service Platform, with examples on usage here.

Some key facts:

• Temporal resolution:
  • Hourly atmospheric fields
  • Daily mean ocean fields
• Spatial resolution:
  • resolution=high → HEALPIX H512.
  • resolution=standard → HEALPIX H128.

Data is provided on various levtype values, for different parameters. The levtype values are as follows:

• hl : Height level field. The key levelist is used to specify the level in metres (e.g. 100). For parameters at height > 10m.
• o2d : 2D ocean field. Note that this can be the ocean surface, or other 2D levels such as at 2 metres or total column integrations.
• o3d : 3D ocean field. The key levelist is used to specify the index of the level. Technical details of these levels can be found here.
• pl : Pressure level field. The key levelist is used to specify the level in hPa (e.g. 1000).
• sfc : 2D atmospheric surface field. Note that this can be the earth surface, or other 2D levels such as at 2 metres or total column integrations
• sol : 3D multi-level model field. This encompasses fields from soil, sea-ice and snow model which use multi-layer schemes. The key levelist is used to specify the index of the level.

For example, retrieve historical (hist) data, parameters "Surface pressure" (param 134) and "2 metre temperature" (param 167), on 2nd January 2000 at times 0000 to 0600 every hour:

request = {
    'class': 'ng',
    'activity': 'CMIP6',
    'experiment': 'hist',
    'expver': '0001',
    'model': 'IFS-FESOM', 
    'generation': '1',
    'realization': '1',
    'resolution': 'high', 
    'date': '20000102',
    'time': '0000/0100/0200/0300/0400/0500/0600',
    'stream': 'clte',
    'type': 'fc',
    'levtype': 'sfc',
    'param': '134/167'
}

Modifying the request can then be performed based on the available output parameters and data layout as detailed below. You can find more examples on usage here.

request = {
    'class': 'd1',
    'dataset': 'climate-dt',
    'activity': 'ScenarioMIP',
    'experiment': 'SSP3-7.0',
    'expver': '0001',
    'model': 'IFS-NEMO',
    'generation': '1',
    'realization': '2',
    'resolution': 'high',
    'date': '20200102',
    'time': '0000/0100/0200/0300/0400/0500/0600',
    'stream': 'clte',
    'type': 'fc',
    'levtype': 'sfc',
    'param': '134/167'
}

 Further technical details and an errata for the data (including which databridge stores which data) can be found here:

• Data portfolio errata for NextGEMS
• Data portfolio technical details for NextGEMS

If you have any questions or need support, please go to the DestinE support pages, where there is also a "Contact Us" webform.

Output parameters

Below is a catalogue of the parameters provided as part of the DestinE ClimateDT data portfolio and for which model they are available.

Fields on a single level or surface

Atmosphere (levtype sfc)

Time resolution: Hourly (time=0000/0100/...)

Time resolution: Hourly accumulation (time=0000/0100/...)

Time resolution: Daily (date=YYYYMMDD,time=0000)

Please refer to a ClimateDT IFS-FESOM historical run to obtain these background fields.

Sea ice (levtype o2d)

Time resolution: Daily mean (date=YYYYMMDD,time=0000)

Ocean (levtype o2d)

Time resolution: Daily mean (date=YYYYMMDD,time=0000)

Fields on pressure levels (levtype pl)

Time resolution: Hourly (time=0000/0100/...)

19 pressure levels: (1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10, 5, 1)

Fields on model levels

Sea-ice/snow/soil (levtype sol)

Time resolution: Hourly (time=0000/0100/...)
5 model levels: (1, ..., 5)

Ocean (levtype o3d)

Time resolution: 1 x daily (date=YYYYMMDD,time=0000)
NEMO: 75 model levels: (1, ..., 75)
FESOM: 72 model levels: (1, ..., 72)

Fields on height levels (levtype hl)

Time resolution: Hourly (time=0000/0100/...)

These are only for height levels >10m to preserve backwards compatibility with longstanding model fields (2t, 10u, 10v,...)

Full data layout

Below is a tree showing the detailed structure of the data layout, with the date(s) YYYYMMDD as follows:

• CMIP6-hist: 19900101 to 20191231
• ScenarioMIP-SSP3-7.0: 20200120 to 20491231

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