Diurnal temperature variation
From Wikipedia, the free encyclopedia
Diurnal temperature variation is a meteorological term that relates to the variation in temperature that occurs from the highs of the day to the cool of nights. Meteorology is the scientific study of the atmosphere that focuses on weather processes and forecasting. ... For other uses, see Temperature (disambiguation). ... Look up day in Wiktionary, the free dictionary. ... This article is about the time of day. ...
Contents |
Temperature lag
Temperature lag is an important factor in diurnal temperature variation. As solar energy strikes the earth’s surface each morning, a shallow (1–3 cm) 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 30°F from just above the ground to waist level. Incoming solar radiation exceeds outgoing heat energy for many hours after noon. 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.[1]
Differences in variation
Diurnal temperature variations are greatest very near the earth’s surface. High desert areas typically have the greatest diurnal temperature variations. Low lying, humid areas typically have the least. This explains why an area like the Snake River Plain can have high temperatures of 38°C (100°F) during a summer day, and then have lows of 5-10°C (40-50°F). At the same time, Washington D.C., which is much more humid, has temperature variations of only 8°C (15°F).[1] Big Southern Buttes Prominence on Snake River Plain The Snake River Plain is a geological feature of (primarily) the American state of Idaho. ... Aerial photo (looking NW) of the Washington Monument and the White House in Washington, DC. Washington, D.C., officially the District of Columbia (also known as D.C.; Washington; the Nations Capital; the District; and, historically, the Federal City) is the capital city and administrative district of the United...
Viticulture
Diurnal temperature variation is of particular importance in viticulture. Wine regions situated in areas of high altitude experience the most dramatic swing in temperature variation during the course of a day. In grapes, this variation has the effect of producing high acid and high sugar content as the grapes' exposure to sunlight increases the ripening qualities while the sudden drop in temperature at night preserves the balance of natural acids in the grape.[2] wine grapes Viticulture (from the Latin word for vine) is the science, production and study of grapes which deals with the series of events that occur in the vineyard. ... Wikipedia does not yet have an article with this exact name. ... Altitude is the elevation of an object from a known level or datum. ... This article is about the fruits of the genus Vitis. ... For other uses, see acid (disambiguation). ... This article is about sugar as food and as an important and widely-traded commodity. ... Prism splitting light High Resolution Solar Spectrum Sunlight in the broad sense is the total spectrum of the electromagnetic radiation given off by the Sun. ...
See also
References
- ^ a b M. Hackworth "Weather & Climate" course notes, with prior permission
- ^ J. Robinson "The Oxford Companion to Wine" Third Edition pg 691 Oxford University Press 2006 ISBN 0198609906
