Autoconvective lapse rate

From Glossary of Meteorology

autoconvective lapse rate

The environmental lapse rate of temperature in an atmosphere in which the density is constant with height (homogeneous atmosphere), equal to g/R, where g is the acceleration of gravity and R the gas constant.

For dry air the autoconvective lapse rate is approximately +3.4 × 10-4°C per cm. Although the term is poorly named (
see autoconvection), it is useful in optics, since it defines the transition between upward and downward refraction of light in the atmosphere.