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Title: STRATOSPHERIC TEMPERATURES AND WATER LOSS FROM MOIST GREENHOUSE ATMOSPHERES OF EARTH-LIKE PLANETS

A radiative-convective climate model is used to calculate stratospheric temperatures and water vapor concentrations for ozone-free atmospheres warmer than that of modern Earth. Cold, dry stratospheres are predicted at low surface temperatures, in agreement with recent 3D calculations. However, at surface temperatures above 350 K, the stratosphere warms and water vapor becomes a major upper atmospheric constituent, allowing water to be lost by photodissociation and hydrogen escape. Hence, a moist greenhouse explanation for loss of water from Venus, or some exoplanet receiving a comparable amount of stellar radiation, remains a viable hypothesis. Temperatures in the upper parts of such atmospheres are well below those estimated for a gray atmosphere, and this factor should be taken into account when performing inverse climate calculations to determine habitable zone boundaries using 1D models.
Authors:
;  [1] ;  [2]
  1. Department of Geosciences, The Pennsylvania State University, State College, PA 16801 (United States)
  2. Department of Astronomy, Boston University, 725 Commonwealth Ave., Boston, MA 02215 (United States)
Publication Date:
OSTI Identifier:
22518745
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 813; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CLIMATE MODELS; CLIMATES; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; HYDROGEN; PHOTOLYSIS; SATELLITE ATMOSPHERES; SATELLITES; STELLAR RADIATION; STRATOSPHERE; VENUS PLANET; WATER VAPOR