Radiative-convective equilibrium with explicit two-dimensional moist convection

I. M. Held, R. S. Hemler, V. Ramaswamy

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Abstract

Radiative-convective statistical equilbria are obtained using a two-dimensional model in which radiative transfer is interactive with the predicted moisture and cloud fields. The domain is periodic in x, with a width of 640 km, and extends from the ground to 26 km. The lower boundary is a fixed-temperature water-saturated surface. The model produces a temperature profile resembling the mean profile observed in the tropics. The model generates a QBO-like oscillation in the x-averaged winds with an apparent period of ~60 days. This oscillation extends into the troposphere and influences the convective organization. In order to avoid the associated large vertical wind shears, calculations are also performed in which the x-averaged winds are constrained to vanish. The convection then evolves into a pattern in which rain falls only within a small part of the domain. The moisture field appears to provide the memory that localizes the convection. If the vertical shears are fixed at a modest nonzero value, this localization is avoided. -from Authors

Original languageEnglish (US)
Pages (from-to)3909-3927
Number of pages19
JournalJournal of the Atmospheric Sciences
Volume50
Issue number23
DOIs
StatePublished - Jan 1 1993

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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