It's the coldest layer because increased altitude means a decrease in solar heating and an increase in cooling caused by Carbon Dioxide radiative emissions.
http://wiki.answers.com/Q/Why_is_the_atmosphere's_colde...
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Temperature here decreases with height, so within the mesosphere it is warmest at its lowest level (−5°C, or 23°F), and becomes coldest at its highest level (−80°C, or −112°F). Depending on latitude and ... The mesosphere is also the layer in which many meteors burn up when they enter the earth's atmosphere,
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www.enotes.com/earth-science/mesosphere
www.enotes.com/earth-science/mesosphere
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Temperatures in the mesosphere drop with increasing altitude to about -100°C. The mesosphere is the coldest of the atmospheric layers. In fact it is colder then Antarctica's lowest recorded temperature. ... The mesosphere is also the layer in which a lot of meteors burn up while entering the Earth's atmosphere.
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www.ace.mmu.ac.uk/eae/Atmosphere/Older/Mesosphere.html
www.ace.mmu.ac.uk/eae/Atmosphere/Older/Mesosphere.html
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LAYERS OF THE ATMOSPHERE; troposphere-close to surface, decreases in temperature and decrease in pressure mesosphere- coldest layer, temperature and perssure decreases as altitude increases as get away from the ozone layer; thermosphere- hot because of absorption of short wave radiation by Nitrogen and oxygen...
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www.lsrhs.net/departments/science/faculty/brandesa/atmo...
www.lsrhs.net/departments/science/faculty/brandesa/atmosphere.html
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They get down to nearly -100° C (~200° F). This is the coldest layer in the atmosphere. 4. That low temperature is attained at the mesopause, which tops the mesosphere. 5. In a manner of thinking, the mesosphere is a resumption of the troposphere after the rude interruption of the ozone layer in the stratosphere.
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www.csulb.edu/~rodrigue/geog140/lectures/thermalstructu...
www.csulb.edu/~rodrigue/geog140/lectures/thermalstructure.html
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The second layer, the stratosphere, contains the ozone (O3) that protects us from ultraviolet (UV) radiation from the sun. The next layer, the mesosphere, is the coldest layer of the atmosphere, and the last layer, the thermosphere, is the hottest.
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www.cmdowns.com/atmosphere-nf.htm
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Thirty to 50 miles above the surface is the mesosphere, the coldest part of the atmosphere. Above the mesosphere, in a layer called the ionosphere (also called the thermosphere), things start to heat up.
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www.learner.org/exhibits/weather/atmosphere.html
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The Mesosphere is the third layer of Earth's atmosphere. The Mesosphere ranges from 48 km to 86 km in altitude. The Mesosphere marks the end of the Homosphere and the beginning of the Heterosphere. The Mesosphere is the coldest layer of the atmosphere and the temperatures reaches as low as 90 C or -130 F.
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www.kinderscience.com/mesosphere.htm
www.kinderscience.com/mesosphere.htm
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