抄録
A particular distribution pattern of air temperature above and near the river appears reflecting the influence of river water, which is smaller as water body compared with sea or lake. The river may be considered as the heat source to air at night in cooler seasons and as the heat sink in the daytime in warmer seasons.
The data of detailed measurement above and near the river shows that the air temperature is clearly higher on the river than on the adjacent field at night in autumn and is lower in the daytime in summer. The difference between air temperatures on the river and on the field lessens higher above the ground, but it remains at the higher points than 14m above the river. Under calm, warmer or cooler air above the river does not spread so far out of the river, but breeze, it reaches some hundred meter leeward from the river. The difference between air temperatures on the bridge and on the adjacent field (ΔTb-a) changes according to the difference between water temperature of the river and air temperature on the field (ΔTw-a). There is a linear relation between ΔTw-a and ΔTb-a.
