Changes between Version 50 and Version 51 of doc/tec/lsm

Timestamp:

Aug 3, 2017 1:02:06 PM (8 years ago)

Author:

maronga

Comment:

--

doc/tec/lsm

@@ -14 +14 @@
 \end{equation*}
 }}}
-where ''C'',,0,, and ''T'',,0,, are the heat capacity and radiative temperature of the surface skin layer, respectively. ''R'',,n,,, ''H'', ''LE'', and ''G'' are the net radiation, sensible heat flux, latent heat flux, and ground (soil) heat flux at the surface, respectively. 
+where ''C'',,0,, and ''T'',,0,, are the heat capacity and radiative temperature of the surface skin layer, respectively. Note that  ''C'',,0,, is usually zero as it is assumed that the skin layer does not have a heat capacity (see also below). ''R'',,n,,, ''H'', ''LE'', and ''G'' are the net radiation, sensible heat flux, latent heat flux, and ground (soil) heat flux at the surface, respectively. 
 
 === Parameterization of ''H'' ===
@@ -41 +41 @@
 \end{equation*}
 }}}
-with ''Λ'' being the heat conductivity between skin layer and the soil, and ''T'',,soil,1,, being the temperature of the uppermost soil layer. When no skin layer is used, ''Λ'' is replaced by the heat conductivity of the uppermost soil layer (divided by the layer depth).
+with ''Λ'' being the total thermal conductivity between skin layer and the uppermost soil layer, and ''T'',,soil,1,, being the temperature of the uppermost soil layer. ''Λ''  is calculated as a combination of the conductivity between the canopy and the soil-top (constant value) and the conductivity of the top half of the uppermost soil layer:
+{{{
+#!Latex
+\begin{equation*}
+\Lambda = \dfrac{\Lambda_\mathrm{skin}\Lambda_\mathrm{skin}}{\Lambda_\mathrm{skin}+\Lambda_\mathrm{skin}}
+\end{equation*}
+}}}
+When no skin layer is used (i.e. in case of bare soil and pavements), ''Λ'' reduces to the heat conductivity of the uppermost soil layer (divided by the layer depth). In that case, it is assumed that the soil temperature is constant within the uppermost 1/4 of the top soil layer and equals the radiative temperature. ''C'',,0,,  is then set to a non-zero value according to the material properties.
 
 === Parameterization of ''LE'' ===