A simple expression for vertical convective fluxes in planetary atmospheres

Details A simple expression for vertical convective fluxes in planetary atmospheres A simple expression for vertical convective fluxes in planetary atmospheres

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icar..165..407l&link_type=abstract

Icarus, Volume 165, Issue 2, p. 407-413.

Physics

10

Scientific paper

We explore the vertical convective flux Fc in a radiative-convective grey atmosphere. An expression of the form Fc=Fsτo/(C+Dτo) appears useful, where Fs is the shortwave flux absorbed at the base of an atmosphere with longwave optical depth τo and /C and /D are constants. We find excellent agreement with an idealized grey radiative-convective model with no shortwave absorption for /D=1 and /C=1~2 depending on the surface-atmosphere temperature contrast and on the imposed critical lapse rate. Where shortwave absorption is correlated with longwave opacity, as in the atmospheres of Earth and Titan, /C=2, /D=2 provides an excellent fit, validated against the present terrestrial situation and the results of a nongrey model of Titan's strongly antigreenhouse atmosphere under a wide range of conditions. The expression may be useful for studying the energetics of planetary climates through time where there is insufficient data to constrain more elaborate models.

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