initial_conditions:atmospheric []

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==== Description ====

The atmospheric initial conditions are generated with OpenIFS  using the FULLPOS system which is a physical interpolation that takes into account the model definitions. The initial conditions are currently generated from ERA5 reanalysis. The members (e.g. fc1-fc9) are generated from the official member fc0, by applying reproducible random perturbations of the 3D temperature field. At BSC, the initial conditions are available in the following folder: /esarchive/releases/ic/atmos/[resol]/[exp]/

Scripts to download and interpolate these fields can be retrieved from https://earth.bsc.es/gitlab/cp/ifs_initial_forcing.git

==== Old Description (before 2021) ====

The atmospheric initial conditions are generated with the IFS code at ECMWF using the FULLPOS system which is a physical interpolation that takes into account the model definitions. The initial conditions are currently generated from ERA-Interim and ERA40, while the surface parameters are replaced in some ICs with the ERA-Land analysis. The ERA-Land analysis is forced by bias-corrected input and represent the surface variables more accurate than ERA-Interim. The members are generated using singular vectors (SV-Pert) or with random perturbations of the SST (SST-Pert). At BSC, the initial conditions are available in the following folder: /esarchive/releases/ic/atmos/[resol]/[exp]/

==== T159L62 ====

^ ID^ ANALYSIS^ GRID^ FIRST^ LAST^ INTERVAL (MONTH)^ MEMBERS^ METHOD |
| b07n| ERA-Interim | T159L62| 19600201| 20110801| 02,05,08,11| fc0 - fc9 | SV-Pert |
| b0nq| ERA-Interim| T159L62| 20130201| 20141101| 02,05,08,11| fc0 - fc9 | SV-Pert |
| b0p4 | ERA-Interim | T159L62| 19800201| 20151031| 02,05,06,08,10,11 | fc0 - fc19 | SV-Pert |
| b0qa | ERA-Interim + ERA-Land analysis | T159L62| 19790201| 20151101| 02,05,08,11 | fc0 - fc9 | SST-Pert |
| b0q8 | ERA40 | T159L62| 19600201| 19781101| 02,05,08,11 | fc0 - fc9 | SST-Pert |
| b0q9 | ERA-Interim | T159L62| 19790201| 20170501| 02,05,08,11 | fc0 - fc9 | SST-Pert |
| b0rf | ERA-Interim | T159L62| 20170801| 20171101| 08,11 | fc0 - fc9 | SST pert |
| b0so | ERA-Interim | T159L62| 20180201| 20181101| 02,05,08,11 | fc0 - fc29 | SST pert |
==== T255L91/62 ====

^ ID^ COMPONENT^ GRID^ FIRST^ LAST^ INTERVAL (MONTH)^ MEMBERS^ METHOD |
| b0p6 | ERA-Interim | T255L91| 19800201| 20151101| 02,06,10 | fc0 - fc19 | SV-Pert |
| b0oo | ERA-Interim | T255L91| 19800201| 20140201| 02| fc0 - fc9 | SV-Pert |
| b0p2 | ERA-Interim | T255L91| 20150201| 20150201| 02| fc0 - fc99 | SV-Pert |
| b0p9 | ERA-Interim | T255L91| 19800101| 20100101| 01| fc0 - fc9 | SV-Pert |
| b0pc | ERA-Interim | T255L91| 20150101| 20150101| 01| fc0 - fc99 | SV-Pert |
| b0ga| ERA-Interim| T255L62| 19790801| 20101101| 02,05,08,11| fc0 - fc9 | NOT IN ESNAS? |
| i05e| ERA-Interim + ERA-Land analysis| T255L91| 19930501| 20091101| 05,11| fc0 - fc9 | SV-Pert |
| i070 | ERA-Interim + ERA-Land analysis forced by WFDEI | T255L91 | 19930501| 20091101| 05,11| fc0 - fc9 | SV-Pert |
| b0io| ERA-Interim| T255L91| 19930501| 20091101| 05,11| fc0 - fc9 | SV-Pert |
| b0q0 | ERA-Interim + ERA-Land analysis (gbg4) | T255L91| 19790201| 20171101| 02,05,08,11 | fc0 - fc9 | 3D T-Pert (SST-Pert on ECFS) |
| a1tz | ERA-Interim + ERA-Land analysis | T255L91| 19790201| 20181101| 01,02,05,08,11 | fc0 | no pert (must use auto-ecearth3) |
| b0q3 | ERA-Interim | T255L91| 19790201| 20151101| 02,05,08,11 | fc0 - fc9 | 3D T-Pert (SST-Pert on ECFS) |
| b0q5 | ERA40 | T255L91| 19600201| 19781101| 11 | fc0 - fc9 | 3D T-Pert (SST-Pert on ECFS) |
| b0rt | ERA-Interim | T255L91| 20160201| 20171101| 02,05,08,11 | fc0 - fc9 | 3D T-Pert |
| b0ro | ERA-Interim + ERA-Land analysis | T255L91| 20180201| 20181101| 02,05,08,11 | fc0 - fc9 | SST-Pert |
| official_repro | AMIP | T255L91| 19500101| 19500101| --- | fc0 - fc4 | 3D T-Pert |
| a2k7 | ERA5| T255L91| 19590101| 20191101| 01,02,05,08,11 | fc00 -fc01 | no pert (must use auto-ecearth3), ERA5-BE (1959-1978) links to a543 |
| cmip6dcpp | ERA40 (b0q5, 1960-1978) / ERA-Interim (b0q0,1979-2017) / ERA5 (a2k7,2018-2020) | T255L91| 19790101| 20191101| 11 | fc00 -fc09 | 3D T-Pert |
| a3p3 | ERA5-BE preliminary | T255L91| 19600101| 19781101| 01,02,05,08,11 | fc00 -fc01 | no pert (must use auto-ecearth3) |
| a543 | ERA5-BE final | T255L91| 19590101| 19781101| 01,02,05,08,11 | fc00 -fc01 | no pert (must use auto-ecearth3), needs update once 1940-1957 is released |

==== T511L91 ====

^ ID^ COMPONENT^ GRID^ FIRST^ LAST^ INTERVAL (MONTH)^ MEMBERS^ METHOD |
| prim | ERA-Interim + ERA-Land climatology (1981-2010) | T511L91| 19500101| 19500101| 01 | fc0  | SV-Pert |
| b0q6 | ERA40 | T511L91| 19600201| 19781101| 02,05,08,11 | fc0 - fc9 | SST-Pert (empty files on /esarchive) |
| b0it | ERA-Interim| T511L91 | 19920501| 20091101| 05,11| fc0 - fc9 | SV-Pert |
| b0q4 | ERA-Interim | T511L91| 19790201| 20151101| 02,05,08,11 | fc0 - fc9 | SST-Pert / 3D T-Pert |
| b0r3 | ERA-Interim | T511L91| 20160201| 20171101 | 02,05,08,11 | fc0 - fc9 | 3D T-Pert |
| b0ru | ERA-Interim | T511L91| 20180201| 20181101 | 02,05,08,11 | fc0 - fc9 | SST Pert |
| b0rp | ERA-Interim + ERA-Land analysis | T511L91| 20180201| 20181101| 02,05,08,11 | fc0 - fc9 | SST Pert |
| i05f | ERA-Interim + ERA-Land analysis | T511L91| 19930501| 20091101| 05,11| fc0 - fc9 | SV-Pert |
| b0q2 | ERA-Interim + ERA-Land analysis | T511L91| 19790201| 20171101| 02,05,08,11 | fc0 - fc9 | 3D T-Pert |
| a1uc | ERA-Interim + ERA-Land analysis (gbg6) | T511L91| 19790101| 20181101| 01,02,05,08,11 | fc00 -fc01 | no pert (must use auto-ecearth3) |
| a2ym | ERA5-HRES| T511L91| 19500101| 20211101| 01,02,05,08,11 | fc0 - fc1 | use auto-ecearth3 |

==== T1279L91 ====

^ ID^ COMPONENT^ GRID^ FIRST^ LAST^ INTERVAL (MONTH)^ MEMBERS^ METHOD |
| b0pr | ERA-Interim | T1279L91| 20050101| 20060101| 01 | fc0  |  |

==== Need for atmospheric initial conditions ====

Add here any needs on initial conditions:

==== Current problems to generate intial conditions ====

1) ERA-Land conditions are only available until 20160831. 


2) ERA-Land conditions are only available after 1980, conditions prior to this date can not be produced currently. 

==== EC-Earth CPWG wiki ====

There is additional information produced for the EC-Earth CP Working Group (CPWG)

https://dev.ec-earth.org/projects/ecearth3/wiki/Atmospheric_initial_conditions_for_climate_predictions

https://dev.ec-earth.org/projects/ecearth3/wiki/Ocean_initial_conditions_for_climate_predictions

https://dev.ec-earth.org/projects/ecearth3/wiki/Sea_ice_initial_conditions_for_climate_predictions

==== IC/nudging file generation howtos ====

https://earth.bsc.es/wiki/doku.php?id=ic_ifs&s[]=%2Aprepifs%2A

https://earth.bsc.es/wiki/doku.php?id=nudging_ifs&s[]=%2Aprepifs%2A
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