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Boundary-Layer Meteorology

, Volume 105, Issue 1, pp 177–193 | Cite as

Area-Averaged Sensible Heat Flux and a New Method to Determine Zero-Plane Displacement Length over an Urban Surface using Scintillometry

  • Manabu Kanda
  • Ryo Moriwaki
  • Matthias Roth
  • Tim Oke
Article

Abstract

Field observations of area-averagedturbulence characteristics were conducted in a densely built-up residential neighbourhood in Tokyo, Japan. In addition to eddy-correlation (EC) sensors a scintillometer was used for the first time in a city. Significant results include: (1) Scintillometer-derived sensible heat fluxes, QH, obtained at a height 3.5 times the building height agree well with those using the EC technique; (2) source areas for the scintillometer fluxes are larger than for the EC sensors, so that at low heights over inhomogeneous terrain scintillometry offers advantages; (3) new similarity relationships for dissipation rates are proposed for urban areas; (4) a new technique that uses simultaneous scintillation measurements at two heights to directly estimate area-averaged zero-plane displacement height, zd, is proposed. zd estimated in this way depends slightly on atmospheric stability (lower zd under more unstable conditions).

Area-averaged turbulence Scintillometer Urban field observation Urban similarity function Zero-plane displacement length 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Manabu Kanda
    • 1
  • Ryo Moriwaki
    • 1
  • Matthias Roth
    • 2
  • Tim Oke
    • 3
  1. 1.Department of International Development EngineeringTokyo Institute of TechnologyMeguro-ku, TokyoJapan
  2. 2.Department of GeographyNational University of SingaporeSingapore
  3. 3.Department of GeographyUniversity of British ColumbiaVancouverCanada

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