Abstract
In this paper, diurnal and seasonal variability of sensible heat (H) and latent heat (LE) fluxes have been investigated at an agricultural site in tropical wet and dry climate, Ile-Ife, Nigeria. Half-hourly averaged flux data for two complete years (2017–2018) of eddy covariance measurements at the study site was used to determine the seasonal trend of Bowen ratio (Bo). In wet season (April–October), diurnal range for both fluxes, H and LE, was 75.3 W m−2 and 177.0 W m−2, respectively. Conversely, in dry season (December–February), the range for H and LE was 182.0 W m−2 and 89.9 W m−2 respectively. For wet season, the daily mean value of H was 19.7 ± 27.2 W m−2 and LE was 52.1 ± 63.5 W m−2, while for dry season, H and LE were 44.0 ± 66.4 W m−2 and 26.6 ± 33.7 W m−2 respectively. A reversal of relative magnitudes of both fluxes was observed, such that the values of H were larger in dry season (Bo > 1) but lower in wet season (Bo < 1). There is a lag of about 1 h between H and LE.
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