Interfacing the Urban Land–Atmosphere System Through Coupled Urban Canopy and Atmospheric Models

Jiyun Song, Zhihua Wang

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

We couple a single column model (SCM) to a cutting-edge single-layer urban canopy model (SLUCM) with realistic representation of urban hydrological processes. The land-surface transport of energy and moisture parametrized by the SLUCM provides lower boundary conditions to the overlying atmosphere. The coupled SLUCM–SCM model is tested against field measurements of sensible and latent heat fluxes in the surface layer, as well as vertical profiles of temperature and humidity in the mixed layer under convective conditions. The model is then used to simulate urban land–atmosphere interactions by changing urban geometry, surface albedo, vegetation fraction and aerodynamic roughness. Results show that changes of landscape characteristics have a significant impact on the growth of the boundary layer as well as on the distributions of temperature and humidity in the mixed layer. Overall, the proposed numerical framework provides a useful stand-alone modelling tool, with which the impact of urban land-surface conditions on the local hydrometeorology can be assessed via land–atmosphere interactions.

Original languageEnglish (US)
Pages (from-to)427-448
Number of pages22
JournalBoundary-Layer Meteorology
Volume154
Issue number3
DOIs
StatePublished - Jan 1 2014

Keywords

  • Land-use land-cover changes
  • Land–atmosphere interactions
  • Single column atmospheric model
  • Urban canopy model
  • Urban planning

ASJC Scopus subject areas

  • Atmospheric Science

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