Estimation of Bulk Transfer Coefficient and Surface Moisture Availability on a Sorghum Field in Sand Dune

Reiji Kimura, Junsei Kondo, Kyoichi Otsuki, Makio Kamichika

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Abstract

The bulk transfer method combined with the heat balance equation of the surface requires the bulk transfer coefficient for sensible heat flux CHU and the surface moisture availability β (evapotranspiration efficiency) to evaluate the surface temperature Ts, sensible heat flux H and latent heat flux lE, respectively. This paper examines relations between these coefficients and various factors (soil moisture content, solar radiation). Meteorological observations on a sorghum field in Tottori sand dune were carried out for 6-28 August, 1994. Significant results of the observations are the followings: 1) The value of bulk transfer coefficient varied with the atmospheric stability. 2) The value of β increased with increasing solar radiation, and tended to a constant value (β=0.35) when the solar radiation exceeded about 600 Wm-2. 3) The value of β increased according to the soil moisture content. Observations of Ts, H and lE were compared with the simulations with the single source model (Kondo and Watanabe, 1992). This model simulates well the observed values of the daily mean of Ts, H and lE within an error of about±20 Wm-2,±20 Wm-2 and ±1.1°C, respectively.

Original languageEnglish
Pages (from-to)131-140
Number of pages10
JournalJournal of Agricultural Meteorology
Volume53
Issue number2
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Atmospheric Science

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