The tropopause is identified in a radiosonde temperature profile as the level where the steep, roughly constant tropospheric lapse rate abruptly transitions to a much smaller (near-isothermal or inverted) lapse rate characteristic of the stratosphere, marking the boundary between the two atmospheric layers.
Examining the temperature changes between successive pressure levels: from 100 kPa to 30 kPa, temperature drops steeply and steadily (13°C down to -47°C), consistent with...
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