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Grass · surfaces — Low vegetation (Havu et al 2024)grass composite

Surface bundlesgrasshelsinkicity

Composition

This composite is assembled from the entries below. Each evidence record keeps its own scientific review; a separate composition review assesses why these components were selected and how they are mapped.

albedoGrassland/herbaceous generic Awaiting sign-off
alb_min 0.19 · alb_max 0.19
emissivityGrass generic Awaiting sign-off
emis 0.93
water_storageGrass swindon Awaiting sign-off
storage_drain_params.store_min 1.9 · storage_drain_params.store_max 1.9
leaf_area_indexGrass helsinki Awaiting sign-off
lai.lai_type 1 · lai.lai_min 1.6 · lai.lai_max 5.9
leaf_growth_powerGrass, LaiEq = 1 helsinki Awaiting sign-off
lai.lai_power.growth_lai 0.04 · lai.lai_power.growth_gdd 0.002 · lai.lai_power.senescence_lai -1.5
drainageGrass generic Awaiting sign-off
storage_drain_params.drain_eq 3 · storage_drain_params.drain_coef_1 0.013 · storage_drain_params.drain_coef_2 1.71
max_vegetation_conductanceGrass helsinki Awaiting sign-off
max_conductance 3.7
porosityDummy value generic Agent assessed
biogen_co2Mixed low vegetation helsinki Awaiting sign-off
alpha_bio_co2 0.031 · beta_bio_co2 5.312 · theta_bio_co2 0.723
snow_lim_patchGrass generic Awaiting sign-off
snowpack_limit 190
vegetation_growthGrass helsinki Curation required
lai.base_temperature 5 · lai.base_temperature_senescence 10 · lai.gdd_full 300
ohm · summer_wetShort grass [30] Awaiting sign-off
a1 0.32 · a2 0.54 · a3 -27.4
ohm · summer_dryShort grass [30] Awaiting sign-off
a1 0.32 · a2 0.54 · a3 -27.4
ohm · winter_wetShort grass [30] Awaiting sign-off
a1 0.32 · a2 0.54 · a3 -27.4
ohm · winter_dryShort grass [30] Awaiting sign-off
a1 0.32 · a2 0.54 · a3 -27.4

Composition provenance

Curation required

Assembled · assessed by provenance-audit · 2026-08-23. Agent assessment is composition review preparation, not human verification.

Short grass [30]Selected component

Fills all four ohm positions, summer_wet, summer_dry, winter_wet and winter_dry. The record declares target ohm_coefficients, name "Short grass [30]" and source grimmond1991b; it carries no place or representativeness field. It declares no season_label, so one set fills all four positions.

Dummy valueSelected component

Fills the porosity slot structurally. The assumed, unreferenced "Dummy value" adapter has an empty parameters mapping and only preserved legacy -999 sentinels, so it contributes no active parameter and makes no literature-value claim.

Mixed low vegetationSelected component

Fills the biogen_co2 slot. The record declares target land_cover.grass, name "Mixed low vegetation", place helsinki, representativeness city and source havu-m2024. This is the only slot in which the composite differs from archetypes/surfaces/grass/helsinki-finland--grass-havu-et-al-2024.

Grass, LaiEq = 1Selected component

Fills the leaf_growth_power slot. The record declares target land_cover.grass, name "Grass, LaiEq = 1", place helsinki, representativeness city and source havu-m2024-data.

GrassSelected component

Fills the max_vegetation_conductance slot. The record declares target land_cover.grass, name "Grass", place helsinki, representativeness city and source havu-m2024.

GrassSelected component

Fills the vegetation_growth slot. The record declares target land_cover.grass, name "Grass", place helsinki, representativeness city and source jarvi2014.

GrassSelected component

Fills the snow_lim_patch slot. The stable path and origin retain Helsinki migration lineage, while the record declares target land_cover.grass, name "Grass", place generic, representativeness generic, applicable_scale land_cover, source jarvi2014 and method literature.

Grassland/herbaceousSelected component

Fills the albedo slot. The record declares target land_cover.grass, name "Grassland/herbaceous", place generic, representativeness generic, source vargo2013 and method literature.

GrassSelected component

Fills the drainage slot. The record is the generic, land-cover-scale Grass tuple published by Järvi et al.; Havu's archive is retained as later Helsinki compilation evidence.

GrassSelected component

Fills the leaf_area_index slot. The record declares target land_cover.grass, name "Grass (SE England)", place helsinki, representativeness city and source havu-m2024. Its stable path, name and origin retain the legacy SE England migration text.

GrassSelected component

Fills the emissivity slot. The record declares target land_cover.grass, name "Grass", place generic and representativeness generic; it carries source jarvi2011 and declares method literature.

GrassSelected component

Fills the water_storage slot. The stable path retains SE England migration lineage, while the record declares target land_cover.grass, name "Grass", place swindon, representativeness site, source ward2018 and method literature.

Assessment findings

Composite identitysupported
The composite's name reads "Low vegetation (Havu et al 2024)", its place reads helsinki and its origin reads Helsinki, Finland. The low-vegetation label sits correctly on a land_cover.grass target: of the land-cover surfaces docs/FORMAT.md lists, namely paved, bldgs, evetr, dectr, grass, bsoil and water, grass is the only low-vegetation tile. The label is carried by one component, records/surfaces/grass/helsinki--havu-m2024--biogen-co2--mixed-low-vegetation, named "Mixed low vegetation", which is the single slot separating this entry from archetypes/surfaces/grass/helsinki-finland--grass-havu-et-al-2024. Three components declare source havu-m2024, the leaf-growth-power component declares havu-m2024-data, and the drainage component declares jarvi2011 while appearing in Havu's archived configuration. Together those slots give the entry its identity.
Composite targetsupported
The composite declares target land_cover.grass. Eleven of the twelve components declare target land_cover.grass and the twelfth, records/ohm/generic--unreferenced--grass, declares target ohm_coefficients, which is what the ohm slot takes: docs/FORMAT.md puts the four season and wetness positions of supy's ohm_coef on the archetype rather than on the coefficient records. Surface records carry no attaches_to field, which in this database appears only on the profile records under records/profiles/, so the slot check rests on the parameter names each component carries, and every slot receives a component holding the fields that slot names. The ohm component is named "Short grass [30]", the grass-specific coefficient set rather than a vegetation average, and it fills all four positions because it declares no season_label and no wet or dry distinction.
Own parameter valuesnot applicable
The composite declares no parameters of its own, so it overrides no component value; the exported fragment is its components merged into their slots.
Composition rationalenot applicable
The composite declares no source field and asserts no parameters of its own, so there is no published composition rationale to review. The archetype format does allow a composite to carry a source, as the snow archetypes do for the scalars they assert themselves, and this entry carries none. Each component's own source belongs to that component's evidence assessment.
Place applicabilitycuration required
The composite declares place helsinki. Five components carry that place, one site-scoped water-storage record carries place swindon, five components are generic and the OHM record carries no place. Snowpack limit and drainage are generic Järvi literature inputs. The Swindon site import needs an explicit composition rationale for this Helsinki typology.
Representativenesscuration required
The composite declares representativeness city. Five components are city, five are generic, the Swindon water-storage record is site-scoped and the OHM record carries no class. The site result is narrower than the city typology and needs composition-level adjudication.
Slot and season mappingsupported
An assembly of twelve existing records into the twelve slots the vegetation archetypes use, and assembled is the method a composition sidecar takes. The composite produces no value of its own.
Completeness and uniquenesssupported
The uses block fills all twelve slots the vegetation archetypes use, namely albedo, emissivity, water_storage, leaf_area_index, leaf_growth_power, drainage, max_vegetation_conductance, porosity, biogen_co2, snow_lim_patch, vegetation_growth and ohm, which is the slot vocabulary every land_cover.grass, land_cover.dectr and land_cover.evetr archetype in the database uses, so no slot is missing. The ohm slot names one record in all four positions. archetypes/surfaces/grass/helsinki-finland--grass-havu-et-al-2024 takes the same eleven components and differs only in the biogen_co2 slot, where it takes records/surfaces/grass/helsinki--havu-m2024--biogen-co2 ("Grass (lawn)") in place of the "Mixed low vegetation" record this entry takes. The two records differ, so the pair is not a duplication, but the entire distinction between two published typologies rests on one biogenic CO2 set, which a reader comparing them should know.

Scientific note

The entry is the mixed-low-vegetation sibling of archetypes/surfaces/grass/helsinki-finland--grass-havu-et-al-2024 and differs from it in one slot only, biogen_co2, where it takes records/surfaces/grass/helsinki--havu-m2024--biogen-co2--mixed-low-vegetation rather than the lawn record. That is a deliberate split rather than a duplication, and the names carry it. Five of twelve components declare place helsinki; three declare source havu-m2024 and the leaf-growth-power record declares havu-m2024-data. The Järvi-sourced drainage record appears in Havu's archive. The leaf-area slot takes that study's Helsinki record whose stable path and label retain legacy SE England text, and the label sits correctly on a land_cover.grass target because grass is the only low-vegetation tile in the land-cover set. The drainage component is now explicitly generic literature evidence, with the archived Helsinki reuse recorded in its own sidecar. Snowpack limit is likewise a generic Järvi literature default. The site-scoped Swindon water-storage import needs an explicit Helsinki composition rationale.

Model-ready fragment

Paste under land_cover.grass in a SUEWS YAML configuration; every value carries its citation.

alb_min:
  value: 0.19
  ref:
    ID: vargo2013
    DOI: 10.1016/j.jenvman.2012.10.007
    desc: generic, generic
alb_max:
  value: 0.19
  ref:
    ID: vargo2013
    DOI: 10.1016/j.jenvman.2012.10.007
    desc: generic, generic
emis:
  value: 0.93
  ref:
    ID: jarvi2011
    DOI: 10.1016/j.jhydrol.2011.10.001
    desc: generic, generic
storage_drain_params:
  store_min:
    value: 1.9
    ref:
      ID: ward2018
      DOI: 10.1002/joc.5200
      desc: swindon, site
  store_max:
    value: 1.9
    ref:
      ID: ward2018
      DOI: 10.1002/joc.5200
      desc: swindon, site
  drain_eq:
    value: 3
    ref:
      ID: jarvi2011
      DOI: 10.1016/j.jhydrol.2011.10.001
      desc: generic, generic, land_cover
  drain_coef_1:
    value: 0.013
    ref:
      ID: jarvi2011
      DOI: 10.1016/j.jhydrol.2011.10.001
      desc: generic, generic, land_cover
  drain_coef_2:
    value: 1.71
    ref:
      ID: jarvi2011
      DOI: 10.1016/j.jhydrol.2011.10.001
      desc: generic, generic, land_cover
lai:
  lai_type:
    value: 1
    ref:
      ID: havu-m2024-data
      DOI: 10.5281/zenodo.10572180
      desc: helsinki, city
  lai_min:
    value: 1.6
    ref:
      ID: havu-m2024-data
      DOI: 10.5281/zenodo.10572180
      desc: helsinki, city
  lai_max:
    value: 5.9
    ref:
      ID: havu-m2024-data
      DOI: 10.5281/zenodo.10572180
      desc: helsinki, city
  lai_power:
    growth_lai:
      value: 0.04
      ref:
        ID: havu-m2024-data
        DOI: 10.5281/zenodo.10572180
        desc: helsinki, city
    growth_gdd:
      value: 0.002
      ref:
        ID: havu-m2024-data
        DOI: 10.5281/zenodo.10572180
        desc: helsinki, city
    senescence_lai:
      value: -1.5
      ref:
        ID: havu-m2024-data
        DOI: 10.5281/zenodo.10572180
        desc: helsinki, city
    senescence_sdd:
      value: 0.0005
      ref:
        ID: havu-m2024-data
        DOI: 10.5281/zenodo.10572180
        desc: helsinki, city
  base_temperature:
    value: 5
    ref:
      ID: jarvi2014
      DOI: 10.5194/gmd-7-1691-2014
      desc: helsinki, city
  base_temperature_senescence:
    value: 10
    ref:
      ID: jarvi2014
      DOI: 10.5194/gmd-7-1691-2014
      desc: helsinki, city
  gdd_full:
    value: 300
    ref:
      ID: jarvi2014
      DOI: 10.5194/gmd-7-1691-2014
      desc: helsinki, city
  sdd_full:
    value: -450
    ref:
      ID: jarvi2014
      DOI: 10.5194/gmd-7-1691-2014
      desc: helsinki, city
wet_threshold:
  value: 1.9
  ref:
    ID: jarvi2011
    DOI: 10.1016/j.jhydrol.2011.10.001
    desc: generic, generic, land_cover
max_conductance:
  value: 3.7
  ref:
    ID: havu-m2024
    DOI: 10.1016/j.ufug.2024.128261
    desc: helsinki, city
alpha_bio_co2:
  value: 0.031
  ref:
    ID: bellucco2017
    DOI: 10.1016/j.agrformet.2016.12.011
    desc: helsinki, site
beta_bio_co2:
  value: 5.312
  ref:
    ID: havu-m2024-data
    DOI: 10.5281/zenodo.10572180
    desc: helsinki, site
theta_bio_co2:
  value: 0.723
  ref:
    ID: bellucco2017
    DOI: 10.1016/j.agrformet.2016.12.011
    desc: helsinki, site
resp_a:
  value: 2.1
  ref:
    ID: jarvi2019
    DOI: 10.1029/2018JD029576
    desc: helsinki, site
resp_b:
  value: 0.06
  ref:
    ID: jarvi2019
    DOI: 10.1029/2018JD029576
    desc: helsinki, site
min_res_bioco2:
  value: 0.6
  ref:
    ID: jarvi2019
    DOI: 10.1029/2018JD029576
    desc: finland, site
snowpack_limit:
  value: 190
  ref:
    ID: jarvi2014
    DOI: 10.5194/gmd-7-1691-2014
    desc: generic, generic, land_cover
ohm_coef:
  summer_wet:
    a1:
      value: 0.32
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
    a2:
      value: 0.54
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
    a3:
      value: -27.4
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
  summer_dry:
    a1:
      value: 0.32
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
    a2:
      value: 0.54
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
    a3:
      value: -27.4
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
  winter_wet:
    a1:
      value: 0.32
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
    a2:
      value: 0.54
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
    a3:
      value: -27.4
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
  winter_dry:
    a1:
      value: 0.32
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
    a2:
      value: 0.54
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover
    a3:
      value: -27.4
      ref:
        ID: grimmond1991b
        DOI: 10.1016/0957-1272(91)90003-W
        desc: land_cover

Composition review

Curation requiredReview procedure

Composite metadata

Scopecity
Targetland_cover.grass · docs
Origin“Helsinki, Finland” (verbatim legacy string)
Schema2026.5 · legacy row 24240019
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