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Unformatted text preview: Troposphere The troposphere is the lowest and densest part of the atmosphere and is characterised by a decrease in temperature with altitude.  The temperature falls from about 320 K at the base of the troposphere at −300 km to 53 K at 50 km.   The temperature at the cold upper boundary of the troposphere (the tropopause) actually varies in the range between 49 and 57 K depending on planetary latitude, with the lowest temperature reached near 25° southern latitude .   The troposphere holds almost all of the mass of the atmosphere, and the tropopause region is also responsible for the vast majority of the planet’s thermal far infrared emissions, thus determining its effective temperature of 59.1 ± 0.3 K.   The troposphere is believed to possess a highly complex cloud structure; water clouds are hypothesised to lie in the pressure range of 50 to 300 bar, ammonium hydrosulfide clouds in the range of 20 and 40 bar, ammonia or hydrogen sulfide clouds at between 3 and 10 bar and finally...
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.
- Fall '10