JULES:Joint UK Land Environment

Simulator

A community land surface scheme

MOSES + TRIFFID

Radiation

Rainfall

Snow

Evaporation and CO2 exchange frombare soil, trees, grass, snow etc

Darcian flowof soil moisture

Deep drainage

Roots extract soil moisture fortranspiration

Surface runoff

Unified into MOSESIIIn 2002

Relationship between JULES and MOSES

Met Office Unified Model

MOSESII JULES v1

IMOGEN CRU GSWP2Tower fluxes

Modular

Soil/root model

Crop model

surface flux model

Hydrology model

DGVM

Ocean and sea ice

JULES modular structure

Unified Model IMOGEN Other driving data

soil

Canopy conductancephenology

Dynamic vegetation

radiation

snow

hydrology

Surface exchange

Test Data: International Experiments

ABRACOS/LBArainforest

and grassland

BOREASboreal forest

and snow

FIFEgrassland

HAPEX-SAHEL

savannah

HAPEX-MOBHILYagriculture and

forest

LAPPTundra

GAME

tundra and forest

MAGS,northern rivers

SiberiaII

FLUXNET/ Carbon-Europe

Improved Processes

• Phenology

• Radiation transfer through the canopy

• Soils – soil freezing, peaty soils

• DVGM

• Heterogeneity – topography / hydrology

• Snow

Improving processes in JULES

• 10-layer improved ‘Light mod’

Far more realistic

• Big leaf – unrealistic representation

• Importance of canopy structure

and leaf angle inclination

New Processes

• Nitrogen, Phosphorus, Ozone, Isotopes

• Wetlands and methane production

• Elevation tiles

• More hydrology: irrigation, crop models,

• Groundwater

Distributed

e.g. GLDAS soil porosity

Distributed ancillary files (soil, land cover etc) now available globally

HIECroP - historic crop water use and carbon production

Nimrod – real time hydrology

Rainfall

Soil Moisture

Surface Runoff

Distributed applications

River Flow

With PDMWithout PDM

Daily average runoff from catchment in France

Satellite ObservationsPatterns of soil moisture in Sahel

Blue (cool): recent rain, red soil surface dried

Rainfall varies at large range of scalesMemory retained at surface, potential feedbacks

Calibration Methods

New methods needed to deal with: •Multiple data sets•Different levels of certainty of data•Time series at a point verses Snap-shots of spatial data•Integrated data (e.g. river flow, areal evaporation)•Uncertainty of parameters – Monte Carlo simulations

example: predicted map of wetlands over N Europe

Linking JULES with observations

Land Surface Modelling

Distributed Applications

•Land cover types calibrated•Global or local•Verification

Field Observations

EvaporationCO2 fluxSoil moisture

Radiation

RainfallSnow

Evaporation

Deep drainage

Runoff

Radiation

RainfallSnow

Evaporation

Deep drainage

Runoff

verification

MODIS snow cover

Tools for climate research (IMOGEN)

BaseClimate

AnomalyPatterns

Atmospheric Greenhouse Gas Concentrations

JULES Land Surface Scheme

scale factor

Meteorological forcing variables Fluxes:

CO2, CH4

Anthropogenic emissions

Web access

DESCRIPTION OF THE CODE

JULESJULES is the Joint UK Land Environment Simulator. It is based on

MOSES (Met Office Surface Exchange System), the land surface model used in the Unified Model of the UK Met Office. MOSES was

originally designed to use to represent the land surface in Meteorological and Climate models, but is increasingly used for other

purposes: predicting river flows, identifying global wetlands, quantifying water resources. It was therefore decided to officially

release the model from its original role in two ways. Firstly, the model should become a community model and secondly, the model should be used and developed independently of the meteorological and climate

model.The CODE is available for any researcher, free of charge. A license can be downloaded from this website (see DOWNLOAD THE LICENSE).The development of the code is ongoing. The latest version is described in DESCRIPTION OF THE CODE and the next release versions, with

dates, are outlined in MANAGEMENT OF JULES.For further information, please contact JULES@JCHMR.ORG.UK

  

     

                  

DOWNLOAD THE LICENSE

Science in JULES

Results

Version 1 of the code is available to researchers. From end of October, access will be via a web-site.