Changes between Version 19 and Version 20 of doc/tec/microphysics

Timestamp:

May 22, 2018 12:51:30 PM (7 years ago)

Author:

schwenkel

Comment:

--

doc/tec/microphysics

@@ -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.
 
-PALM offers three different schemes for the treatment of liquid phase microphysics. The Kessler
-Liquid phase microphysics are parametrized 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). The model predicts the first two moments of these partial droplet spectra, namely cloud and rain
+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)].
+
+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
 droplet number concentration (''N'',,c,, and ''N'',,r,,, respectively) as well as cloud and rain water mixing ratio
 (''q'',,c,, and ''q'',,r,,, respectively). Consequently, ''q'',,l,, is the sum of both ''q'',,c,, and ''q'',,r,,. The moments' corresponding microphysical tendencies are derived by assuming the partial droplet spectra to follow a gamma distribution that can be described by the predicted quantities and empirical relationships for the distribution's slope and shape parameters. For a detailed derivation of these terms, see [#seifert2001 Seifert and Beheng (2001],[#seifert2006  2006)].
@@ -400 +401 @@
 * [=#sommeria1977]'''Sommeria G, Deardorff JW.''' 1977. Subgrid-scale condensation in models of nonprecipitating clouds. J. Atmos. Sci. 34: 344–355.
 
-* [=#kessler1969]'''Kessler E''' 1969. On the Distribution and Continuity of Water Substance in Atmospheric Circulation. Meteor. Monogr: 1-84.
+* [=#kessler1969]'''Kessler E.''' 1969. On the Distribution and Continuity of Water Substance in Atmospheric Circulation. Meteor. Monogr: 1-84.
 
 * [=#pruppacher1997]'''Pruppacher HR, and Klett JD.''' 1997. Microphysics of Clouds and Precipitation. 2nd Edn. Kluwer Academic Publishers. Dordrecht.