Changes between Version 21 and Version 22 of doc/tec/microphysics
- Timestamp:
- May 22, 2018 1:08:47 PM (7 years ago)
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doc/tec/microphysics
v21 v22 18 18 instead of ''θ'' as described in Sect. [wiki:doc/tec/gov governing equations]. Since ''q'' and ''θ'',,l,, are conserved quantities for wet adiabatic processes, condensation/evaporation is not considered for these variables. 19 19 20 PALM offers three different schemes ([#kessler1969 Kessler (1969)], [#seifert2001 Seifert and Beheng (2001],[#seifert2006 2006)], Morisson (2007)) for the treatment of liquid phase microphysics. The [#kessler1969 Kessler (1969)] scheme provides a computational inexpensive way for the bulk microphysics. However, it only converts supersaturation into liquid water and considering autoconversion after a parameterization of [#kessler1969 Kessler (1969)].20 PALM offers three different schemes ([#kessler1969 Kessler (1969)], [#seifert2001 Seifert and Beheng (2001],[#seifert2006 2006)], [#morrison2007 Morrison (2007)]) for the treatment of liquid phase microphysics. The [#kessler1969 Kessler (1969)] scheme provides a computational inexpensive way for the bulk microphysics. However, it only converts supersaturation into liquid water and considering autoconversion after a parameterization of [#kessler1969 Kessler (1969)]. 21 21 22 22 A more detailed parameterization is given by following the two-moment scheme of [#seifert2001 Seifert and Beheng (2001],[#seifert2006 2006)], which is based on the separation of the droplet spectrum into droplets with radii < 40 μm (cloud droplets) and droplets with radii ≥ 40 μm (rain droplets). Here, the model predicts the first two moments of these partial droplet spectra, namely cloud and rain … … 46 46 }}} 47 47 with ''N'',,c,, and ''q'',,c,, being a fixed parameter and a diagnostic quantity, respectively. 48 The Morrison microphysics scheme 49 50 In the next subsections we will describe the diagnostic determination of ''q'',,c,,. From Sect. [wiki:doc/tec/microphysics#Autoconversion autoconversion] on, the microphysical processes considered in the sink/source terms of ''θ'',,l,,, ''q'', ''N'',,r,, and ''q'',,r,,, 48 49 The [#morrison2007 Morrison (2007)] microphysics scheme can be understood as an extension of the scheme of [#seifert2001 Seifert and Beheng (2001],[#seifert2006 2006)], where ''N'',,c,, and ''q'',,c,, are prognostic quantities as well. 50 51 In the next subsections we will describe the diagnostic/prognostic determination (in dependence of the chosen scheme) of ''q'',,c,,. From Sect. [wiki:doc/tec/microphysics#Autoconversion autoconversion] on, the microphysical processes considered in the sink/source terms of ''θ'',,l,,, ''q'', ''N'',,r,, and ''q'',,r,,, 51 52 {{{ 52 53 #!Latex