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vol. 10, nr. 1 (2007)
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The relation between soil heat flux and solar radiation
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Jan Kossowski
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Institute of Agrophysics, Polish Academy of Sciences, ul. Doświadczalna 4, 20-290 Lublin |
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vol. 10 (2007), nr. 1,
pp. 121-135
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abstract:
The paper presents an analysis of daily courses of heat flux density in bare soil in relation to global solar radiation intensity, as well as the relationship between sums of positive soil heat flux values (directed into soil) and daily sums of solar radiation (separately and together with standard meteorological elements). The observational materials were collected during 42 days without precipitation in May-July periods on the experimental fields at Felin near Lublin. It was found that the ratio of soil heat flux into soil to solar radiation values changed during a day in a distinctive way and was higher in the morning (with maximum about 0.25-0.3) than in the afternoon. However, the ratio of sum of positive soil heat flux to sum of solar radiation on examined days ranged from 0.09 to 0.29 (on average 0.18). Obtained linear regression equation describing the sums of heat flux into soil as a function of solar radiation sums (with determination coefficient 0.67) appeared to be insufficiently useful for the estimation of the soil heat flux sum.
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keywords:
soil heat flux, global solar radiation, days without precipitation
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original in:
Polish
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