Moist convection on Neptune

Details Moist convection on Neptune Moist convection on Neptune

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..929s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Aug. 1989, p. 929-932.

Physics

15

Atmospheric Moisture, Convection Clouds, Methane, Neptune Atmosphere, Adiabatic Conditions, Planetary Atmospheres, Temperature Profiles, Neptune, Convection, Methane, Stability, Clouds, Temperature, Structure, Velocity, Stratosphere, Motion, Hypotheses, Circulation, Atmosphere

Scientific paper

A study of methane moist convection on Neptune examines the stability conditions which initiate moist convection of methane clouds. Temperature lapse rates that are unstable to moist convection are subadiabatic by a factor of two or more, while adiabatic and superadiabatic lapse rates are stable. In the observed Neptune temperature structure, vertical velocities greater than 40 m/s are required to lift moist air above the stable region and initiate moist convection. Alternatively, moist convection could be initiated by air that is slightly drier than its surroundings. Moist convective clouds achieve altitudes up to 100 mb, thereby exceeding the temperature minimum and depositing methane in the Neptune stratosphere. At least 2000 such clouds penetrate the Neptune stratosphere/hour.

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