The temperature at Tropical Tropopause (Ht 17 km) is about ............. °C.
–75
The tropopause is the boundary between the troposphere and the stratosphere, where temperature stops falling with height.
Over the tropics the tropopause lies very high, at about 16 to 18 km, so the air has cooled for a long distance at the environmental lapse rate of about 6.5 °C per km.
Starting from a surface temperature near 27 to 30 °C, this cooling brings the air to roughly –75 °C to –80 °C at the tropical tropopause, making it the coldest part of the lower atmosphere.
A value of –50 °C or –60 °C fits the much lower polar and mid-latitude tropopause, while –95 °C is colder than normally observed there.
Hence, –75.
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