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A radiative-convective climate model is used to calculate stratospherictemperatures and water vapor concentrations for ozone-free atmospheres warmerthan that of modern Earth. Cold, dry stratospheres are predicted at low surfacetemperatures, in agreement with recent 3-D calculations. However, at surfacetemperatures above 350 K, the stratosphere warms and water vapor becomes amajor upper atmospheric constituent, allowing water to be lost byphotodissociation and hydrogen escape. Hence, a 'moist greenhouse' explanationfor loss of water from Venus, or some exoplanet receiving a comparable amountof stellar radiation, remains a viable hypothesis. Temperatures in the upperparts of such atmospheres are well below those estimated for a gray atmosphere,and this factor should be taken into account when performing 'inverse' climatecalculations to determine habitable zone boundaries using 1-D models.

Stratospheric Temperatures and Water Loss from Moist Greenhouse Atmospheres of Earth-like Planets