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Temperature and Moisture Equations

The thermodynamic equation and moisture equations, for temperature and moisture projections tex2html_wrap_inline2536 and tex2html_wrap_inline2510 associated with basis functions tex2html_wrap_inline3134 and tex2html_wrap_inline3196 are:

  equation1066

  equation1071

For QTCM1, we use a version of the Betts-Miller (1986) moist convective adjustment scheme, with convection restoring temperature toward convective profile tex2html_wrap_inline2986 . The moisture sink and convective heating terms are given by

equation1076

where tex2html_wrap_inline3200 , with tex2html_wrap_inline3202 the time scale of convection in strongly convecting regions and tex2html_wrap_inline3204 a smoothed Heaviside function depending on tex2html_wrap_inline3206 , given in square brackets, a quantity related to CAPE projected on retained structures. The convective profile of temperature is given as tex2html_wrap_inline3208 a reference profile independent of space, plus departures tex2html_wrap_inline3210 following a moist adiabat from the boundary layer with vertical profile of tex2html_wrap_inline3134 . An additional closure assumption is required, which links tex2html_wrap_inline3210 to tex2html_wrap_inline2536 and tex2html_wrap_inline2510 after some manipulation. Examples of this closure are discussed in  [1] where the dry stability tex2html_wrap_inline3220 and the gross moisture stratification tex2html_wrap_inline3222 are the contributions of s and q to tex2html_wrap_inline2870 in (5.12). The sum of these equations yields the moist static energy equations (5.11) with the q terms simplified to tex2html_wrap_inline3232 .



Climate Systems Interaction Group
Sun Aug 25 00:58:46 PDT 2002