JULES
Science in JULES
JULES has a tiled model of sub-grid heterogeneity (see Figure) with separate surface temperatures, shortwave and long-wave radiative fluxes, sensible and latent heat fluxes, ground heat fluxes, canopy moisture contents, snow masses and snow melt rates are computed for each surface type in a grid-box. Nine surface types are recognized: broadleaf trees, needleleaf trees, C3 (temperate) grass, C4 (tropical) grass, shrubs, urban, inland water, bare soil and ice. Except for those classified as land-ice, a land grid-box can be made up from any mixture of the first 8 surface types. Fractions of surface types within each land-surface grid-box are read from an ancillary file or modelled by TRIFFID. Air temperature, humidity and windspeed on atmospheric model levels above the surface and soil temperatures and moisture contents below the surface are treated as homogeneous across a grid-box.
