SUEWS parameter database

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Grass · phenology thresholds — Grass (SE England)grass evidence record

lai.base_temperature6
lai.base_temperature_senescence11
lai.gdd_full300
lai.sdd_full-450
phenologygrassse-englandregionalWard 2016

Parameters

Names follow the SUEWS YAML specification; click one for its definition in the configuration reference.

Labelled fields override the record-level citation or scope; unlabelled fields use the record metadata.

lai.base_temperature6
lai.base_temperature_senescence11
lai.gdd_full300 Järvi 2011
lai.sdd_full-450 Järvi 2011

Provenance evidence

Awaiting sign-off

Assumed · assessed by provenance-audit · 2026-08-25. Agent assessment is evidence preparation, not human verification.

Surface Urban Energy and Water Balance Scheme (SUEWS): Development and evaluation at two UK sitesParameter source

Applies to: parameters.lai.base_temperature, parameters.lai.base_temperature_senescence

Where: Section 4.1, Seasonal cycle of vegetation phenology, p. 7

States that the growing-degree-day base temperature was raised from 5 to 6 degrees C for the Swindon and London applications and that the senescence base temperature was set to 11 degrees C.

The Surface Urban Energy and Water Balance Scheme (SUEWS): Evaluation in Los Angeles and Vancouver.Parameter source

Applies to: parameters.lai.gdd_full, parameters.lai.sdd_full

Where: Equation 4, dynamic daily LAI, p. 221

Defines the daily LAI response to growing and senescence degree days and their base temperatures.

Where: Table 2b, general model run options, p. 223

Publishes GDD 300 and SDD -450 as general model-run options, rather than SE England-specific values.

Assessment findings

Namesupported
Ward et al. evaluate vegetation phenology for the Swindon and London UK applications. The stable target and name identify this copy of the shared settings as the grass record.
Targetsupported
Ward Section 4.1 and Järvi Equation 4 define the growing- and senescence-degree-day controls represented by the four nested lai fields.
Valuessupported
Ward states base temperatures 6 and 11 degrees C for the UK applications. Järvi Table 2b publishes the inherited general run options GDD 300 and SDD -450. No value is changed.
issue #142
Sourcesupported
Ward remains the source for the two UK base temperatures, while parameter-level overrides identify Järvi 2011 as the original publication for gdd_full and sdd_full.
issue #142
Placesupported
Ward supports the SE England application context for the two base temperatures. Järvi presents GDD and SDD as general model-run options, supporting the generic place override for those leaves.
Representativenesssupported
Ward applies the base temperatures at both UK sites and relates the growth threshold to latitude, supporting the regional envelope. Järvi publishes GDD and SDD as general options, supporting their generic overrides rather than attributing them specifically to SE England.
Methodsupported
Ward increased or set the base temperatures as application choices, and Järvi Table 2b states GDD and SDD as general run options. Assumed is therefore the supported method for all four leaves.
Identitysupported
The stable path, grass target and legacy ID retain the migrated SE England phenology identity; field-level provenance changes no parameter or record identity.

Scientific note

Ward et al. document the UK base-temperature choices but not the inherited GDD and SDD thresholds. Järvi et al. (2011) is the original publication that states those thresholds as general model-run options. The record keeps its whole four-value phenology tuple and stable identity while exporting the correct citation and scope for each leaf.

Model-ready fragment

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

lai:
  base_temperature:
    value: 6
    ref:
      ID: ward2016
      DOI: 10.1016/j.uclim.2016.05.001
      desc: se-england, regional
  base_temperature_senescence:
    value: 11
    ref:
      ID: ward2016
      DOI: 10.1016/j.uclim.2016.05.001
      desc: se-england, regional
  gdd_full:
    value: 300
    ref:
      ID: jarvi2011
      DOI: 10.1016/j.jhydrol.2011.10.001
      desc: generic, generic
  sdd_full:
    value: -450
    ref:
      ID: jarvi2011
      DOI: 10.1016/j.jhydrol.2011.10.001
      desc: generic, generic

Evidence review

Awaiting sign-offSign off evidence on GitHub

Raises a prefilled sign-off issue. CI accepts it only when the issue author is in the verifier registry and the evidence revision is still current.

Review procedure

Record metadata

Scoperegional
Targetland_cover.grass · docs
Origin“SE England” (verbatim legacy string)
Schema2026.5 · legacy row 35240046

Same study, same place

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all 10 sets from ward2016 at se-england →
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