Core configurations


The configurations listed here are those that are currently considered 'core' by the JULES management and science committees.

Note that the JULES core configurations are currently being revised and updated and advice on which configuration to use for both coupled and standalone JULES will likely change once the next versions of UKESM and GL/GA have been released (probably before the end of 2017) (and the JULES docs repo, which currently holds a slightly different list of configurations including the deprecated UKESM1 and EURO4, should also be updated at that point).

*** NOTE FOR JULES STANDALONE USERS *** Because Rose suites for standalone JULES are not yet available for UKESM or GL7.0 (as reported at the meeting 18-JUL-17 at CEH Wallingford), the current situation is that JULES users can only access older configuration files (links provided in the table below) or use alternative research configurations here until this situation has been resolved.


Here are the official JULES core configurations (see here for all configurations). When available, configurations are provided as either sets of namelists (which may be used to run JULES either with or without the Rose system) or as Rose suites (see here for an example of using these).

n.b. Because of the greater testing requirements for coupled configurations, and therefore correspondingly longer lead times for version releases, offline model setups will usually include more up-to-date science than their closest coupled counterparts. For benchmarking tests for some of these configurations, see the evaluation page.


Source / Suite ID

(AM = Alberto Martínez de la Torre at CEH Wallingford)


See UKESM website and here. JULES-C is the Carbon-Cycle configuration of JULES, designed to produce good global vegetation distributions and carbon fluxes. JULES-C is now the prototype configuration for the UKESM.

The first version of JULES-C was based on parameters used in the ISI-MIP project and used can_rad_mod=1. JULES-C uses TRIFFID, competing vegetation and the multi-layer snow scheme, and is made up of two parts (a spin up run using l_trif_eq=T and a long triffid_period, followed by a transient run, started from the end dump of the spinup run, using l_trif_eq=F and a shorter triffid_period).

See the JWCRP page here, the main TRAC UKESM page and Anna Harper's 2016 presentation here, which also mentions the related research configurations JULES-C-1p1, JULES-CN (JULES-C-1p1 with the new soil biogeochemistry model *** to be released late Autumn 2017 ***) and JULES-ES (*** to be released late Autumn 2017 ***).

Download the JULES-C namelists here and see suite IDs for JULES-C here.

AM's suite for use with JULESvn4.7 and WFDEI data: u-ai347

Search Rosie Go for "JULES-C", etc.

Global Land GL

The GL7.0 configuration (at least in coupled GA/GL mode, i.e. used in conjunction with the Global Atmosphere (GA) configuration) is defined by the jobs listed on the GA/GL Documentation page (n.b. GL7.1 differs from GL7.0 only in terms of atmospheric aerosols and therefore can be used interchangeably for JULES standalone runs).

GL is a configuration of JULES being developed by the UKMO's Global Atmospheric Model Development group and John Edwards for use across weather and climate modelling timescales and systems. GL4.0 was released Feb 2012, GL5.0 in Feb 2013, GL6.0 in Oct 2013 and GL7.0 in Jan 2016 (see Walters et al. 2014, Walters et al. 2017 and this table of Rose suites).

There is some convergence now between the UKESM and GL configurations (e.g. from Alistair Sellar's talk here we know that the GL7.1 configuration is going to be used in UKESM1 as part of HadGEM3-GC3.1). GL8.0 is currently under development (Sep 2017).

Download the GL4.0 namelists here (later GL configs are not yet available as namelists for JULES standalone).

AM's GL4.0 suite for use with JULESvn4.7 and WFDEI data: u-ai349

Search Rosie Go for "GL6.0" or "GL7" or, for coupled runs, see GA documentation for suite IDs

Operational global forecast

This configuration aims to replicate the science used in the Met Office global NWP forecast model. This configuration uses JULES's aggregate surface tile, i.e. l_aggregate=TRUE (which makes it only approximate for land surface modelling).

Download the namelists here.

AM's suite for use with JULESvn4.7 and WFDEI data: u-ai348

Operational UKV

As mentioned here and on the UKV website, this configuration replicates the science used in the Met Office UK Variable resolution forecast model.

Note: From what I understand of page 29 and fig 19 of PDF icon Lock-et-al-2016-DiurnalKD16_v1.compressed.pdf regarding canopy height, UKV now requires all C3 grass to be 1.46 m tall (although this is currently being reviewed). However, the JULES namelist in the repo still has canht=0.79 m. Either this means the UKV has been updated elsewhere and the JULES-UKV config is now out-of-date, or there are now two UKV configurations (?). Toby

Extents of UKV and EURO4 (application outside this domain is unsupported):

Download the namelists here.

AM's suite for use with JULESvn4.7 and WFDEI data: u-ai345

Note that inclusion in these tables is not intended to mean a configuration is necessarily 'recommended' for your particular use of JULES: these are configurations that have been tried and tested in particular situations and therefore should be consistent and accurate in those contexts, but you will have to assess for yourself whether it is suitable for your application of JULES. For example, in many operational configurations intended for the UM configurations are optimised for best results across ocean and sea ice surfaces as well as land surface, which means that they may not be as optimal as other configurations on land-only runs.