Control subseasonal re-forecast experiment (2004-2023, 11 members)

Title Control subseasonal re-forecast experiment (2004-2023, 11 members)
Description 11-member coupled subseasonal re-forecast experiment using a prototype CY49R2 configuration of the IFS–NEMO4–SI3 system. Re-forecasts are initialized on the first day of each month, covering the period 2004 to 2023, and are integrated out to +46 days. The atmospheric component runs at Tco319L137 and is initialized from ERA5, ocean and sea-ice components run at eORCA0.25Z75 and are initialized from ORAS6.
DOI 10.21957/740z-8p32
Experiment ID iwm0
Experiment class ECMWF Research Department
Examples

2-meter temperature forecasts for a single hindcast initialization, all 10 perturbed ensemble members

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer

server = ECMWFDataServer()

server.retrieve({
    "class": "rd",
    "dataset": "research",
    "date": "2024-01-01",
    "expver": "iwm0",
    "hdate": "2004-01-01",
    "levtype": "sfc",
    "number": "1/to/10",
    "param": "2t",
    "step": "0/to/240/by/24",
    "stream": "enfh",
    "target": "output.grib",
    "time": "00:00:00",
    "type": "pf"
})

500hPa-geopotential forecasts for all 20 hindcasts initialized on January 1st, unperturbed control member

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer

server = ECMWFDataServer()

server.retrieve({
    "class": "rd",
    "dataset": "research",
    "date": "2024-01-01",
    "expver": "iwm0",
    "hdate": "2004-01-01/2005-01-01/2006-01-01/2007-01-01/2008-01-01/2009-01-01/2010-01-01/2011-01-01/2012-01-01/2013-01-01/2014-01-01/2015-01-01/2016-01-01/2017-01-01/2018-01-01/2019-01-01/2020-01-01/2021-01-01/2022-01-01/2023-01-01",
    "levelist": "500",
    "levtype": "pl",
    "param": "z",
    "step": "0/to/240/by/24",
    "stream": "enfh",
    "target": "output.grib",
    "time": "00:00:00",
    "type": "cf"
})