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Grass · phenology thresholdsgrass evidence record

lai.base_temperature5
lai.base_temperature_senescence10
lai.gdd_full300
lai.sdd_full-450
phenologygrasshelsinkicityJärvi 2014

Parameters

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

lai.base_temperature5
lai.base_temperature_senescence10
lai.gdd_full300
lai.sdd_full-450

Provenance evidence

Curation required

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

Development of the Surface Urban Energy and Water Balance Scheme (SUEWS) for cold climate citiesLater compilation

Where: Table 4b, overall area parameter values, p. 1701

Gives alpha_s,min 0.18, alpha_s,max 0.85, epsilon_s 0.99, a0 0.1, a1 9.9 x 10^3 as printed, a2 0.0102, GDD 300, SDD -450, TBaseGDD 5 degC, TBaseSDD 10 degC, TBaseQF 18.2 degC, Ks 0.0005 mm s-1, a_r 0.0016 mm W-1 h-1 and T_lim 2.2 degC, among others. It is a single set for the whole area.

Development of the Surface Urban Energy and Water Balance Scheme (SUEWS) for cold climate citiesLater compilation

Where: Table 4 caption, p. 1701

States that sources of the values are as in Järvi et al. (2011) unless indicated otherwise below, so an unfootnoted cell in this table is an inherited value rather than one this study determined.

Development of the Surface Urban Energy and Water Balance Scheme (SUEWS) for cold climate citiesLater compilation

Where: Table 1, characteristics of the observational sites, p. 1696

Five sites: Kumpula, Pasila and Pihlajamäki in Helsinki, and an urban and a suburban site in Montreal. Each Helsinki eddy covariance footprint is a 1 km radius circle and the catchments are 23.8 and 44.8 ha. London is not a study site; the word appears in the article only in a code-availability address and in a publisher's address in the reference list.

Assessment findings

Namesupported
Grass matches the record's land_cover.grass target.
Targetsupported
Growing and senescence degree-day thresholds are land_cover.grass phenology properties.
Valuessupported
All four are in Table 4b exactly: TBaseGDD 5 degC, TBaseSDD 10 degC, GDD 300 and SDD -450. Table 4b is headed overall area parameter values, so it gives one set for the whole area rather than per vegetation type, which is why the three vegetation records here are identical.
Sourcecorrection required
The Table 4 caption states that sources of the values are as in Järvi et al. (2011) unless a footnote says otherwise, and this cell carries no footnote. Järvi et al. (2014) compiles the value rather than deriving it.
Placecorrection required
Helsinki is where the study ran; these thresholds are carried forward from earlier work rather than determined there.
Representativenesscorrection required
The record claims city representativeness. Table 1 characterises the Helsinki eddy covariance footprints as 1 km radius circles and the two catchments as 23.8 and 44.8 ha; the study determines neighbourhood-scale values, not city-wide ones.
Methodcuration required
Inherited from an earlier publication, so the production method is not this study's.
Identitysupported
The three vegetation phenology records hold the same four thresholds because Table 4b publishes one area-wide set, not three.

Scientific note

The four thresholds are in Table 4b verbatim and the triplication across deciduous, evergreen and grass is what the source prescribes: Table 4b gives one area-wide set rather than a set per vegetation type. What the record overstates is provenance. The caption makes these inherited values, so citing this paper credits it with thresholds it carried forward, and Helsinki city representativeness does not follow from a study whose footprints are 1 km circles.

Model-ready fragment

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

lai:
  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

Evidence review

Curation requiredReview procedure

Record metadata

Scopecity
Targetland_cover.grass · docs
Origin“Helsinki” (verbatim legacy string)
Schema2026.5 · legacy row 35240003

Used by 9 typologies

Same study, same place

all 7 sets from jarvi2014 at helsinki →
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