Large-ensemble subseasonal reforecasts for the period 2001-2020 (CY47R3)

Title Large-ensemble subseasonal reforecasts for the period 2001-2020 (CY47R3)
Description 101-member coupled IFS (cycle 47R3) subseasonal reforecasts covering the period 2001-2020 with forecasts initialized on February 1st, May 1st, August 1st, and November 1st. The atmosphere is configured with 137 vertical levels and uses the Tco319 cubic octahedral reduced Gaussian grid. The IFS is coupled hourly to the 75 level version of the NEMO v3.4 ocean model and the LIM2 sea-ice model, both of which use the ORCA025 tripolar grid. Coupling follows the implementation used in ECMWF CY47R3 operational reforecasts. Atmospheric fields are initialized from the ERA5 reanalysis and ocean and sea-ice initial conditions are derived from the 5-member OCEAN5 ensemble (re)analysis. Ensemble spread in coupled forecasts is generated through a combination of initial condition perturbations and stochastic parameterizations in the atmospheric model.
DOI 10.21957/ya5k-2k48
Experiment ID hsff
Experiment class ECMWF Research Department
Examples

Perturbed member pressure level data for February 1st reforecasts 

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

server = ECMWFDataServer()

server.retrieve({
    "class": "rd",
    "dataset": "research",
    "date": "2021-02-01",
    "expver": "hsff",
    "hdate": "2001-02-01/2002-02-01/2003-02-01/2004-02-01/2005-02-01/2006-02-01/2007-02-01/2008-02-01/2009-02-01/2010-02-01/2011-02-01/2012-02-01/2013-02-01/2014-02-01/2015-02-01/2016-02-01/2017-02-01/2018-02-01/2019-02-01/2020-02-01",
    "levelist": "50/100/200/250/500/700/850/1000",
    "levtype": "pl",
    "number": "1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/31/32/33/34/35/36/37/38/39/40/41/42/43/44/45/46/47/48/49/50/51/52/53/54/55/56/57/58/59/60/61/62/63/64/65/66/67/68/69/70/71/72/73/74/75/76/77/78/79/80/81/82/83/84/85/86/87/88/89/90/91/92/93/94/95/96/97/98/99/100",
    "param": "129.128/130.128/131/132/133.128/135.128/138.128/155.128/157.128",
    "step": "0/12/24/36/48/60/72/84/96/108/120/132/144/156/168/180/192/204/216/228/240/252/264/276/288/300/312/324/336/348/360/372/384/396/408/420/432/444/456/468/480/492/504/516/528/540/552/564/576/588/600/612/624/636/648/660/672/684/696/708/720/732/744/756/768/780/792/804/816/828/840/852/864/876/888/900/912/924/936/948/960/972/984/996/1008/1020/1032/1044/1056/1068/1080/1092/1104",
    "stream": "enfh",
    "target": "output",
    "time": "00:00:00",
    "type": "pf"
})

Perturbed member surface data for February 1st reforecasts 

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

server = ECMWFDataServer()

server.retrieve({
    "class": "rd",
    "dataset": "research",
    "date": "2021-02-01",
    "expver": "hsff",
    "hdate": "2001-02-01/2002-02-01/2003-02-01/2004-02-01/2005-02-01/2006-02-01/2007-02-01/2008-02-01/2009-02-01/2010-02-01/2011-02-01/2012-02-01/2013-02-01/2014-02-01/2015-02-01/2016-02-01/2017-02-01/2018-02-01/2019-02-01/2020-02-01",
    "levtype": "sfc",
    "number": "1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/31/32/33/34/35/36/37/38/39/40/41/42/43/44/45/46/47/48/49/50/51/52/53/54/55/56/57/58/59/60/61/62/63/64/65/66/67/68/69/70/71/72/73/74/75/76/77/78/79/80/81/82/83/84/85/86/87/88/89/90/91/92/93/94/95/96/97/98/99/100",
    "param": "1.228/20.3/29.228/31.128/32.128/33.128/34.128/35.128/36.128/37.128/38.128/39.128/40.128/41.128/42.128/47.128/49.128/129.128/131.151/132.151/136.128/137.128/139.128/141.128/142.128/143.128/144.128/145.128/146.128/147.128/148.128/151.128/159.128/164.128/165.128/166.128/167.128/168.128/169.128/170.128/172.128/173.128/174.128/175.128/176.128/177.128/178.128/179.128/180.128/181.128/182.128/183.128/186.128/187.128/188.128/189.128/197.128/198.128/201.128/202.128/205.128/216.228/217.228/218.228/219.228/220.228/221.228/228.128/235.128/236.128/238.128/243.128/244.128/251.228/228050/260015/260121/260123",
    "step": "0/12/24/36/48/60/72/84/96/108/120/132/144/156/168/180/192/204/216/228/240/252/264/276/288/300/312/324/336/348/360/372/384/396/408/420/432/444/456/468/480/492/504/516/528/540/552/564/576/588/600/612/624/636/648/660/672/684/696/708/720/732/744/756/768/780/792/804/816/828/840/852/864/876/888/900/912/924/936/948/960/972/984/996/1008/1020/1032/1044/1056/1068/1080/1092/1104",
    "stream": "enfh",
    "target": "output",
    "time": "00:00:00",
    "type": "pf"
})