Impact model: JULES-ES-55

JULES model Earth System configuration based on the land-surface of UKESM1. JULES at vn5.5 and includes TRIP rivers, landuse, dynamic vegetation (TRIFFID - on a daily timestep) and the nitrogen cycle.

ISIMIP2b

Person responsible for model simulations in this simulation round

Camilla Mathison: camilla.mathison@metoffice.gov.uk, 0000-0002-6269-4605, UK Met Office (UK)

Additional persons involved: Camilla Mathison

Output Data

Experiments: VI, VII
Climate Drivers: None
Date: 2021-03-16

Basic information

Model Version: 5.5

Model Output License: CC BY 4.0

Model Homepage: https://code.metoffice.gov.uk/trac/jules

Model License: JULES is available to anyone for non-commercial use, free of charge. Noting the JULES licence conditions, the JULES Fair Use and Publication Policy and the MOSRS user terms and conditions.

Simulation Round Specific Description: Paper on UKESM1 which includes the Earth System configuration of JULES. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019MS001739

Resolution

Spatial aggregation: regular grid

Horizontal resolution: 0.5°x0.5°

Temporal resolution of input data: climate variables: daily

Temporal resolution of input data: co2: annual

Temporal resolution of input data: land use/land cover: annual

Temporal resolution of input data: soil: constant

Input data

Simulated atmospheric climate data sets used: IPSL-CM5A-LR, HadGEM2-ES, GFDL-ESM2M, MIROC5

Observed atmospheric climate data sets used: EWEMBI

Emissions data sets used: Atmospheric CO2 concentration

Land use data sets used: Future land-use patterns, Historical, gridded land use (HYDE 3.2)

Other human influences data sets used: Nitrogen deposition (ISIMIP2)

Other data sets used: Land-sea mask

Additional input data sets: TRIP river ancillary.

Climate variables: huss, sfcWind, tasmax, tas, tasmin, rlds, rsds, ps, pr

Additional information about input variables: tasmax and tasmin used to calculate tas_range, which is input into the model.

Spin-up

Was a spin-up performed?: Yes

Spin-up design: 500 spinup cycles of 20 years starting from 1861.

Model set-up specifications

How do you simulate bioenergy? i.e. what pft do you simulate on bioenergy land?: No

How do you simulate the transition from cropland to bioenergy?: No

How do you simulate pasture (which pft)?: Yes we use c3 and c4 grasses.

Key model processes

Dynamic vegetation: Yes, a competed fractional cover and canopy height of PFTs are simulated by the TRIFFID vegetation dynamics (Cox, 2001)

Nitrogen limitation: Yes via the inclusion of interactive nitrogen cycling in the terrestrial carbon cycle

Co2 effects: Yes via the terrestrial carbon cycle

Light interception: The canopy radiation scheme includes an exponential decline of leaf N with canopy height proportional to LAI, following Beer’s law.

Light utilization: Photosynthesis is simulated using the scheme of Clark et al. (2011) updated in Harper et al. (2016).

Phenology: Phenology is simulated interactively using the scheme of Clark et al. (2011)

Heat stress: No although photosynthesis may slow down when outside of optimum temperature range as soon as temperatures are back in optimum range photosynthesis continues as before.

Differences in rooting depth: Yes, this is different for each pft

Root distribution over depth: An exponential root distribution with depth is assumed, with e-folding depth which depends on the pft

Coupling/feedback between soil moisture and surface temperature: Yes

Latent heat: Yes

Sensible heat: Yes

Causes of mortality in vegetation models

Fire: No

NBP components

Fire: No

Land-use change: Yes

Land-use change implementation

Is shifting cultivation included?: No

Fire modules

Aggregation of reported burnt area: No

Land-use classes allowed to burn: No

Included fire-ignition factors: No

Is fire ignition implemented as a random process?: No

Is human influence on fire ignition and/or suppression included? how?: No

How is fire spread/extent modelled?: No

Are deforestation or land clearing fires included?: No

What is the minimum burned area fraction at grid level?: No