1. Introduction

This page provides a data catalogue of the parameters provided as part of the DestinE Extremes DT data portfolio.

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

Some key facts:

• Forecasts can only be retrieved for start dates 15 days behind the current date.
• Temporal resolution:
  • Hourly instantaneous atmospheric and wave fields for a 4-day forecast.
  • Hourly accumulated atmospheric fields for a 4-day forecast.
  • 6-hourly mean atmospheric fields for a 4-day forecast.
• Spatial resolution:
  • 4.4 km globally, 500 – 750 m over Europe

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.
• 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.

For example, retrieve global forecast data, parameters "Surface pressure" (param 134) and "2 metre temperature" (param 167), for the forecast initialized on a date (limited as above) at 00Z and for hourly lead times from 0 to 6 hours :

request = {
    'class': 'd1',
    'dataset': 'extremes-dt',
    'expver': '0001',
    'stream': 'oper',
    'type': 'fc',
    'date': 'YYYYMMDD',
    'time': '0000',
    'step': '0/1/2/3/4/5/6',
    '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.

Further technical details and an errata for the data can be found here:

• Data portfolio errata for Extremes DT
• Data portfolio technical details for Extremes DT

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

2. 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.

2.1. Fields on a single level or surface

2.1.1. Atmosphere (levtype sfc)

Time resolution: Hourly (step=0/1/2/.../96)

Time resolution: Hourly accumulation (step=0-1/1-2/2-3/.../95-96)

Time resolution: 6 hourly means (step=0-6/6-12/.../90-96)

2.1.2. Wave (stream wave)

Time resolution: Hourly (step=0/1/2/.../96)

2.2. Fields on pressure levels (levtype pl)

Time resolution: Hourly (step=0/1/2/.../96)

21 pressure levels: (1, 2, 3, 5, 7, 10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 500, 700, 850, 925, 1000)

2.3. Fields on height levels (levtype hl)

Time resolution: Hourly (step=0/1/2/.../96)

1 height level: (100)

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

3. Full data layout

Below is a tree showing the detailed structure of the data layout, with the date(s) YYYYMMDD to be at most 15 days behind the current date.