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Diurnal temperature variation : ウィキペディア英語版
Diurnal temperature variation
In meteorology, diurnal temperature variation is the variation between a high temperature and a low temperature that occurs during the same day.
==Temperature lag==
Temperature lag is an important factor in diurnal temperature variation: peak daily temperature generally occurs ''after'' noon, as air keeps net absorbing heat even after noon, and similarly minimum daily temperature generally occurs substantially after midnight, indeed occurring during early morning in the hour around dawn, since heat is lost all night long. The analogous annual phenomenon is seasonal lag.
As solar energy strikes the earth’s surface each morning, a shallow layer of air directly above the ground is heated by conduction. Heat exchange between this shallow layer of warm air and the cooler air above is very inefficient. On a warm summer’s day, for example, air temperatures may vary by from just above the ground to waist height. Incoming solar radiation exceeds outgoing heat energy for many hours after noon and equilibrium is usually reached from 3–5 p.m. but this may be affected by a variety of different things such as large bodies of water, soil type and cover, wind, cloud cover/water vapor, and moisture on the ground.〔(M. Hackworth "Weather & Climate" course notes, with prior permission )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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