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Temperature and Moisture Equations

The thermodynamic equation and moisture equations, for temperature and moisture projections tex2html_wrap_inline1587 and tex2html_wrap_inline1503 associated with basis functions tex2html_wrap_inline1965 and tex2html_wrap_inline2027 are:

  equation958

  equation963

For QTCM1, we use a version of the Betts-Miller (1986) moist convective adjustment scheme, with convection restoring temperature toward convective profile tex2html_wrap_inline1881 . The moisture sink and convective heating terms are given by

equation968

where tex2html_wrap_inline2031 , with tex2html_wrap_inline2033 the time scale of convection in strongly convecting regions and tex2html_wrap_inline2035 a smoothed Heaviside function depending on tex2html_wrap_inline2037 , given in square brackets, a quantity related to CAPE projected on retained structures. The convective profile of temperature is given as tex2html_wrap_inline2039 a reference profile independent of space, plus departures tex2html_wrap_inline2041 following a moist adiabat from the boundary layer with vertical profile of tex2html_wrap_inline1965 . An additional closure assumption is required, which links tex2html_wrap_inline2041 to tex2html_wrap_inline1587 and tex2html_wrap_inline1503 after some manipulation. Examples of this closure are discussed in  [1] and  [], where the dry stability tex2html_wrap_inline2051 and the gross moisture stratification tex2html_wrap_inline2053 are the contributions of s and q to tex2html_wrap_inline1847 in (gif). The sum of these equations yields the moist static energy equations (gif) with the q terms simplified to tex2html_wrap_inline2063 .



Hui Su
Thu Nov 16 00:53:31 PST 2000