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

Reiji Kimura, Junsei Kondo, Kyoichi Otsuki, Makio Kamichika

研究成果: Contribution to journalArticle査読

4 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)131-140
ページ数10
ジャーナルjournal of agricultural meteorology
53
2
DOI
出版ステータス出版済み - 1 1 1997
外部発表はい

All Science Journal Classification (ASJC) codes

  • 農業および作物学
  • 大気科学

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