Changes between Version 3 and Version 4 of doc/app/bcmequ

Timestamp:

Jun 18, 2019 9:45:10 AM (6 years ago)

Author:

schwenkel

Comment:

--

doc/app/bcmequ

@@ -24 +24 @@
 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.
 
-PALM offers three different schemes ([#kessler1969 Kessler (1969)], [#seifert2001 Seifert and Beheng (2001],[#seifert2006  2006)], [#morrison2007 Morrison et al. (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)].
+PALM offers different schemes of ([#kessler1969 Kessler (1969)], [#seifert2001 Seifert and Beheng (2001],[#seifert2006  2006)], [#morrison2007 Morrison et al. (2007)]) for the treatment of liquid phase microphysics.  Depending of the choice of the microphysical scheme the different prognostic quantities are use and different microphysical processes are considered. 
+
+'''Saturation Adjustment'''
+
+Actually, the saturation adjustment scheme does not represent s particular microphysics scheme. It just converts the excess supersaturation into liquid water by neglecting all other microphysical processes. 
+
+'''Kessler'''
+
+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)].
+
+'''Seifert and Beheng'''
 
 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
@@ -53 +63 @@
 with ''N'',,c,, and ''q'',,c,, being a fixed parameter and a diagnostic quantity, respectively.
 
+'''Morrison''' 
+
 The [#morrison2007 Morrison et al. (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. Moreover, using the [#morrison2007 Morrison et al. (2007)] scheme includes an explicit calculation of diffusional growth and an activation parameterization.
+
+'''Morrison no rain'''
+
+Instead of using the Morrison scheme as an extension of the Seifert Beheng scheme. The extension are used as a stand-alone scheme. Therefore, rain processes are neglected but explicit consideration of diffusional growth and activation with prognostic quantities of ''N'',,c,, and ''q'',,c,,. This scheme might be appropriate for fog simulation.
 
 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,,, as well as ''N'',,c,, and ''q'',,c,, for the [#morrison2007 Morrison et al. (2007)] scheme.