Many aspects of the earth's lower atmosphere are characterized
by an abundance of water vapor, but in the upper atmosphere,
above the tropopause, it is very arid because of dehydration
around the very cold region of the tropical tropopause.
In this talk the research history about dryness in the stratosphere
will be presented from observational and modeling perspectives.
Keywords
stratosphere, water vapor, cold trap, tape recorder signal, exchange process between the trposphere and stratosphere