SUEWS parameter database

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Snow parameters — Snow emissivity evidence record

narp_emissivity_snow0.99
snowgenericJärvi 2011

Parameters

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

narp_emissivity_snow0.99

Provenance evidence

Awaiting sign-off

Published value · assessed by provenance-audit · 2026-08-24. Agent assessment is evidence preparation, not human verification.

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

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

Publishes effective surface emissivity for snow, epsilon_snow, as 0.99 among general inputs for model runs evaluated in Los Angeles and Vancouver.

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.

Assessment findings

Namesupported
Snow emissivity describes the parameter directly. Järvi et al. (2011) Table 2b labels epsilon_snow as effective surface emissivity for snow and publishes it as 0.99.
Targetsupported
A snow emissivity is a snow property.
Valuessupported
Järvi et al. (2011) Table 2b gives epsilon_snow 0.99, and Järvi et al. (2014) Table 4b republishes epsilon_s 0.99. Both match the stored value.
Sourcesupported
Järvi et al. (2011) publishes the value in Table 2b. The Järvi et al. (2014) Table 4 caption states that sources are as in the 2011 paper unless marked otherwise, and the emissivity cell has no footnote, so the later paper is correctly retained only as compilation evidence.
Placenot applicable
The record declares no place. Järvi et al. (2011) presents 0.99 as a general model-run input used in both Los Angeles and Vancouver, not as a value determined at either city; the stable path and origin retain legacy Helsinki migration text only.
Representativenesssupported
Generic representativeness matches a general model-run input published without a place-specific derivation and used across both evaluated cities.
Methodsupported
Literature records an inherited published input. Järvi et al. (2011) is the parameter source and Järvi et al. (2014) explicitly carries it forward.
Identitysupported
This is a published SUEWS snow emissivity input, not a test fixture. Järvi et al. (2011) publishes the value directly and Järvi et al. (2014) carries it forward in its model configuration.

Scientific note

Järvi et al. (2011) Table 2b directly publishes epsilon_snow 0.99 as a general model-run input. Järvi et al. (2014) Table 4b republishes epsilon_s 0.99 and points unfootnoted inputs back to the earlier paper. The record therefore represents a generic, placeless literature parameter. Its stable path and origin retain legacy Helsinki migration text, while the name now identifies the published parameter rather than describing it as sample data.

Model-ready fragment

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

narp_emissivity_snow:
  value: 0.99
  ref:
    ID: jarvi2011
    DOI: 10.1016/j.jhydrol.2011.10.001
    desc: 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

Scopegeneric
Targetsnow · docs
Origin“Helsinki” (verbatim legacy string)
Schema2026.5 · legacy row 40241245

Used by 3 typologies

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