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Surface conductance — Ward et al. (2016) generic surface conductance parameterisation (gsModel=2) evidence record

g_max3.5
g_k200
g_q_base0.13
g_q_shape0.7
conductancegenericgenericWard 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.

g_max3.5
g_k200
g_q_base0.13
g_q_shape0.7
g_t30
g_sm0.05
th55 Ward 2016
tl-10 Ward 2016
s15.56 UMEP-dev 2016
s20 UMEP-dev 2016
kmax1200 Ward 2016

Context

Conditions the set was derived under; not model inputs themselves.

context.surface_conductance_model2

Provenance evidence

Awaiting sign-off

Fitted · 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.g_max, parameters.g_k, parameters.g_q_base, parameters.g_q_shape, parameters.g_t, parameters.g_sm, parameters.th, parameters.tl, parameters.kmax

Where: Appendix A, Equations A1-A5 and derivation paragraph, p. 28, 29

Defines the response functions; sets Kmax to 1200, TL to -10, TH to 55 and the paper's wilting-point deficit to 120 mm; and states that non-linear least squares supplied G1-G6 from Swindon data while aiming for coefficients that were as generic as possible.

Where: Appendix A, Table A1, p. 29

Publishes G1 3.5, G2 200, G3 0.13, G4 0.7, G5 30, G6 0.05, TL -10, TH 55 and Kmax 1200, plus a separate 120 mm wilting-point deficit that is not stored directly as s1 or s2.

The article is the original parameter publication for the six fitted response coefficients and the three fixed radiation and temperature limits, but it does not state s1 5.56 or s2 0.

SUEWS v2016a release workbook: SUEWS_SiteInfo18_Lo.xlsmParameter source

Applies to: parameters.s1, parameters.s2

Where: SUEWS_Conductance, row 5, code 200, cells A5:N5

The static workbook cells contain the full tuple, including J5 s1 5.56 and K5 s2 0; N5 labels it New coefficients - Use with gsChoice = 2 (HCW 18 Jun 2015). The downloaded workbook bytes have SHA-256 e1a34632b0ab6b1aa379b8329a92ee584d130f54941c3d9eeca3e3303cde1d42.

Where: V2016a SUEWS_Conductance.txt, code 200

Independently preserves the same code 200 tuple and description in the pinned flat input artifact.

The release configuration is the direct, exact source for the two implementation cells in the SUEWS conductance tuple. It does not establish that they encode the paper's 120 mm deficit.

Assessment findings

Namesupported
Ward et al. present the new generic surface-conductance parameterisation, and the release workbook labels its code 200 tuple for use with gsChoice 2.
Targetsupported
Appendix A defines the conductance response functions and the release workbook places the tuple in SUEWS_Conductance for gsChoice 2.
Valuessupported
Ward Table A1 supports g_max, g_k, g_q_base, g_q_shape, g_t, g_sm, th, tl and kmax. The pinned v2016a workbook supports the complete implemented tuple and is the direct source for s1 5.56 and s2 0. No value is changed.
issue #104
Sourcesupported
Parameter-level provenance now keeps Ward et al. as the source for the nine values they publish while identifying the v2016a release artifact as the source for s1 and s2.
issue #104
Placesupported
The coefficients were informed by an empirical fit to Swindon data, now recorded as the origin, while the authors explicitly aimed for a generic parameterisation.
Representativenesssupported
Ward et al. state that the Swindon-informed coefficients aim to be as generic as possible and set the fixed limits to span a wide range of environmental and climatic conditions.
Methodsupported
G1-G6 were obtained by non-linear least squares after Kmax, TL, TH and the 120 mm paper threshold were set. The canonical method overrides therefore mark th, tl and kmax as assumed; s1 and s2 are also implementation choices stated by the release artifact rather than fitted coefficients from the paper.
Identitysupported
Workbook code 200 contains the exact eleven-value tuple and identifies it for gsChoice 2, supporting the stable path and legacy ID without changing either.

Scientific note

Ward et al. publish six fitted response coefficients and three fixed limits, but express soil-moisture limitation with a 120 mm wilting-point deficit rather than the s1 and s2 fields stored by SUEWS. The authoritative v2016a workbook maps the proposed gsChoice 2 parameterisation to code 200 with s1 5.56 and s2 0. This change preserves the released model tuple and makes that mixed provenance explicit instead of attributing artifact-only cells to the paper or presenting them as an exact encoding of its 120 mm deficit. It also records Swindon as the observational origin while retaining the source-supported generic application scope.

Model-ready fragment

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

g_max:
  value: 3.5
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    desc: generic, generic
g_k:
  value: 200
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    desc: generic, generic
g_q_base:
  value: 0.13
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    desc: generic, generic
g_q_shape:
  value: 0.7
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    desc: generic, generic
g_t:
  value: 30
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    desc: generic, generic
g_sm:
  value: 0.05
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    desc: generic, generic
th:
  value: 55
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    desc: generic, generic
tl:
  value: -10
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    desc: generic, generic
s1:
  value: 5.56
  ref:
    ID: umep-dev2016a
    DOI: null
    desc: generic, generic
s2:
  value: 0
  ref:
    ID: umep-dev2016a
    DOI: null
    desc: generic, generic
kmax:
  value: 1200
  ref:
    ID: ward2016
    DOI: 10.1016/j.uclim.2016.05.001
    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

Placegeneric
Scopegeneric
Targetconductance · docs
Origin“Swindon, UK” (verbatim legacy string)
Schema2026.5 · legacy row 44240002
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