High Resolution Simulation of the Variability of Surface Energy Balance Fluxes Across Central London with Urban Zones for Energy Partitioning

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Loridan, Thomas (author)

High Resolution Simulation of the Variability of Surface Energy Balance Fluxes Across Central London with Urban Zones for Energy Partitioning

Article/chapterEnglish2013

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2013-03-01
Springer Netherlands,2013

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LIBRIS-ID:oai:gup.ub.gu.se/174368
https://gup.ub.gu.se/publication/174368URI
https://doi.org/10.1007/s10546-013-9797-yDOI

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Language:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

The parameterization of surface heat-flux variability in urban areas relies on adequate representation of surface characteristics. Given the horizontal resolutions (e.g. ≈ 0.1–1 km) currently used in numerical weather prediction (NWP) models, properties of the urban surface (e.g. vegetated/built surfaces, street-canyon geometries) often have large spatial variability. Here, a new approach based on Urban Zones to characterize Energy partitioning (UZE) is tested within a NWP model (Weather Research and Forecasting model; WRF v3.2.1) for Greater London. The urban land-surface scheme is the Noah/Single-Layer Urban Canopy Model (SLUCM). Detailed surface information (horizontal resolution 1 km) in central London shows that the UZE offers better characterization of surface properties and their variability compared to default WRF-SLUCM input parameters. In situ observations of the surface energy fluxes and near-surface meteorological variables are used to select the radiation and turbulence parameterization schemes and to evaluate the land-surface scheme and choice of surface parameters. For radiative fluxes, improved performance (e.g. > 25 W m −2 root-mean-square error reduction for the net radiation) is attained with UZE parameters compared to the WRF v3.2.1 default for all three methods from the simplest to the most detailed. The UZE-based spatial fluxes reproduce a priori expectations of greater energy storage and less evaporation in the dense city centre compared to the residential surroundings. Problems in Noah/SLUCM partitioning of energy between the daytime turbulent fluxes are identified with the overestimation of the turbulent sensible heat and underestimation of the turbulent latent heat fluxes.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap Naturgeografi hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Physical Geography hsv//eng
Land-surface parameterization
London
Spatial variability
Urban canopy model
Urban energy fluxes
Urban Zones for Energy partitioning
Weather Research and Forecasting model

Added entries (persons, corporate bodies, meetings, titles ...)

Lindberg, Fredrik,1974Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences(Swepub:gu)xlinfr (author)
Jorba, Oriol (author)
Kotthaus, Simone (author)
Grossman-Clarke, Susanne (author)
Grimmond, C. S. B. (author)
Göteborgs universitetInstitutionen för geovetenskaper (creator_code:org_t)

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In:Boundary-Layer Meteorology: Springer Netherlands147:3, s. 493-5230006-83141573-1472

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By the author/editor: Loridan, Thomas; Lindberg, Fredri ...; Jorba, Oriol; Kotthaus, Simone; Grossman-Clarke, ...; Grimmond, C. S. ...

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