Thermal belt: Difference between revisions
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#<div class="definition"><div class="short_definition">(''Also called'' thermal zone.) Any one of several possible horizontal belts of vegetation type found in mountainous terrain.</div><br/> <div class="paragraph">These belts are primarily the result of vertical [[temperature]] variation. <br/>''See'', for example, [[frostless zone]], [[timber line]].</div><br/> </div> | #<div class="definition"><div class="short_definition">(''Also called'' thermal zone.) Any one of several possible horizontal belts of vegetation type found in mountainous terrain.</div><br/> <div class="paragraph">These belts are primarily the result of vertical [[temperature]] variation. <br/>''See'', for example, [[frostless zone|frostless zone]], [[timber line]].</div><br/> </div> | ||
#<div class="definition"><div class="short_definition">An elevation band along mountain and other terrain slopes where nighttime surface temperatures remain relatively mild compared with temperatures above and below.</div><br/> <div class="paragraph">[[Drainage winds]] carry the coldest air down the slopes to the bottom of the valley. The belt of warmer air (thermal belt) lies above this [[pool of cold air]]. Above the warm belt, [[temperature]] exhibits its [[normal]] decline with [[elevation]], augmented by increased [[radiation]] loss from lower air [[density]] and lower [[moisture content]] at higher altitudes. The impact of this milder slope [[climate]] is a longer [[growing season]], an earlier leafing out and blossoming of trees and other vegetation, and the ability to grow crops that could not survive at lower or higher elevations (e.g., vineyards). Geiger (1965) suggests that this effect influenced early settlement locations: "In Germany this area was preferred for the earliest villages, monasteries, and country houses."</div><br/> </div><div class="reference">Geiger, R. 1965. The Climate Near the Ground. Harvard University Press, Cambridge, Mass., . p. 437. </div><br/> | #<div class="definition"><div class="short_definition">An elevation band along mountain and other terrain slopes where nighttime surface temperatures remain relatively mild compared with temperatures above and below.</div><br/> <div class="paragraph">[[Drainage winds]] carry the coldest air down the slopes to the bottom of the valley. The belt of warmer air (thermal belt) lies above this [[pool of cold air]]. Above the warm belt, [[temperature]] exhibits its [[normal]] decline with [[elevation]], augmented by increased [[radiation]] loss from lower air [[density]] and lower [[moisture content]] at higher altitudes. The impact of this milder slope [[climate]] is a longer [[growing season]], an earlier leafing out and blossoming of trees and other vegetation, and the ability to grow crops that could not survive at lower or higher elevations (e.g., vineyards). Geiger (1965) suggests that this effect influenced early settlement locations: "In Germany this area was preferred for the earliest villages, monasteries, and country houses."</div><br/> </div><div class="reference">Geiger, R. 1965. The Climate Near the Ground. Harvard University Press, Cambridge, Mass., . p. 437. </div><br/> | ||
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Latest revision as of 17:05, 25 April 2012
thermal belt
- (Also called thermal zone.) Any one of several possible horizontal belts of vegetation type found in mountainous terrain.
These belts are primarily the result of vertical temperature variation.
See, for example, frostless zone, timber line.
- An elevation band along mountain and other terrain slopes where nighttime surface temperatures remain relatively mild compared with temperatures above and below.
Drainage winds carry the coldest air down the slopes to the bottom of the valley. The belt of warmer air (thermal belt) lies above this pool of cold air. Above the warm belt, temperature exhibits its normal decline with elevation, augmented by increased radiation loss from lower air density and lower moisture content at higher altitudes. The impact of this milder slope climate is a longer growing season, an earlier leafing out and blossoming of trees and other vegetation, and the ability to grow crops that could not survive at lower or higher elevations (e.g., vineyards). Geiger (1965) suggests that this effect influenced early settlement locations: "In Germany this area was preferred for the earliest villages, monasteries, and country houses."
Geiger, R. 1965. The Climate Near the Ground. Harvard University Press, Cambridge, Mass., . p. 437.
