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OHM coefficients — Residential asphalt-shingle roof, dry, wind below 1 m s-1 [706] evidence record

a10.15
a20.28
a3-6
ohmvancouversiteFacet or componentMeyn 2009

Parameters

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

a10.15
a20.28
a3-6

Provenance evidence

Awaiting sign-off

Fitted · assessed by provenance-audit · 2026-08-26. Agent assessment is evidence preparation, not human verification.

Heat fluxes through roofs and their relevance to estimates of urban heat storageParameter source

Where: Table 4, measured residential asphalt-shingle roof — dry, wind <1 m s-1, p. 750

Five days, averaged across east- and west-facing roof slopes; 0.15, 0.28 h, -6 W m-2.

Roof (own for SMEAR III, Helsinki) [750]Related record

Uses code 706 with six other Meyn rows and code 713 in its documented arithmetic mean.

Assessment findings

Namesupported
Table 4 identifies a residential asphalt-shingle roof under dry conditions with wind below 1 m s-1; code 706 is retained legacy identity.
Targetsupported
The source reports objective-hysteresis coefficients for roof heat storage.
Valuessupported
Table 4 states a1 0.15, a2 0.28 h and a3 -6 W m-2 exactly.
Sourcesupported
Meyn and Oke directly publish the complete fitted tuple.
Placesupported
The measured residential roof is in Vancouver.
Representativenesssupported
The coefficients are derived from one monitored residential roof, supporting site scope.
Applicable Scalesupported
Meyn and Oke fit each tuple to a specific monitored commercial/industrial or residential roof under the stated surface and weather condition, establishing roof-facet scale.
issue #46
Methodsupported
The table reports averages of regression coefficients fitted to hourly measured Q-star and roof conductive heat flux.
Identitysupported
The material, wetness, wind class and exact tuple identify one Table 4 row; the related Helsinki record uses it as an arithmetic-mean input.

Scientific note

The record is a direct, source-coherent transcription of one Table 4 regression row derived from measured fluxes. No canonical field changes.

Model-ready fragment

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

a1:
  value: 0.15
  ref:
    ID: meyn2009
    DOI: 10.1016/j.enbuild.2009.02.005
    desc: vancouver, site, facet
a2:
  value: 0.28
  ref:
    ID: meyn2009
    DOI: 10.1016/j.enbuild.2009.02.005
    desc: vancouver, site, facet
a3:
  value: -6
  ref:
    ID: meyn2009
    DOI: 10.1016/j.enbuild.2009.02.005
    desc: vancouver, site, facet

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

Scopesite
Applicable scaleFacet or component
Targetohm_coefficients · docs
Origin“Vancouver” (verbatim legacy string)
Schema2026.5
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