Changes between Version 4 and Version 5 of doc/tec/lsm

Timestamp:

Apr 4, 2016 2:18:14 PM (9 years ago)

Author:

maronga

Comment:

--

doc/tec/lsm

@@ -2 +2 @@
 
 == Overview ==
-Since r1551 a full land surface model (LSM) is available in PALM. It consists of a four layer soil model, predicting soil temperature and moisture content, and a solver for the energy balance at the surface. Moreover, a liquid water reservoid accounts for the presence of liquid water on plants due to dew/fog. The implementation is based on the ECMWF-IFS land surface parametrization (TESSEL) and its adaption in the DALES model.
+Since r1551 a full land surface model (LSM) is available in PALM. It consists of a four layer soil model, predicting soil temperature and moisture content, and a solver for the energy balance of the skin surface layer. Moreover, a liquid water reservoir accounts for the presence of liquid water on plants and soil due to precipitation. The implementation is based on the ECMWF-IFS land surface parametrization (H-TESSEL) and its adaptation in the DALES model (Heus et al. 2010).
 
-Note that the use of the LSM requires using a [wiki:doc/tec/radiation radiation model].
+Note that the use of the LSM requires using a [wiki:doc/tec/radiation radiation model] to provide radiative fluxes at the surface.
 
-== LSM Overview ==
-{{{#!td style="vertical-align:top" 
-   {{{#!html 
-      <object type="application/pdf" data="http://palm.muk.uni-hannover.de/raw-attachment/wiki/doc/tec/lsm/2015_LSM.pdf#pagemode=&navpanes=1" width="950" height="750" > 
-      <a href="http://palm.muk.uni-hannover.de/raw-attachment/wiki/doc/tec/lsm/2015_LSM.pdf">  
-         <img src="http://palm.muk.uni-hannover.de/chrome/site/gallery/pdf_icon.gif"> 
-      </a> 
-      No Adobe plugin found. You can download the file
-      <a href="http://palm.muk.uni-hannover.de/raw-attachment/wiki/doc/tec/lsm/2015_LSM.pdf">  
-         <b>LSM introduction</b>
-      </a> instead.
-      </object> 
-   }}} 
-}}} 
+== Energy balance solver ==
+The energy balance of the Earth's surface reads
+\begin{equation}
+   C_0 \dfrac{dT_0}{dt} = R_\mathrm{n} - H - LE - G
+  \label{eq:energybalance}
+\end{equation}
+where
+{{{#!Latex $C_0$, $T_0$}}} 
+are the heat capacity and radiative temperature of the surface skin layer, respectively. $R_\mathrm{n}$, $H$, $LE$, and $G$ are the net radiation, sensible heat flux, latent heat flux, and ground (soil) heat flux at the surface, respectively. $H$ is calculated as
+\begin{equation}
+  H = - \rho\ c_\mathrm{p}\ \dfrac{1}{r_\mathrm{a}} ( \theta_1 - \theta_0 )
+\end{equation}
+where $\rho$ is the density of the air, $c_\mathrm{p} = \unit[1005]{J\ kg^{-1} K^{-1}}$ is the specific heat at constant pressure, $r_\mathrm{a}$ is the aerodynamic resistance, and $\theta_0$ and $\theta_1$ are the potential temperature at the surface and at the first grid level above the surface, respectively. $r_\mathrm{a}$ is calculated via Monin-Obukhov similarity theory, based on roughness lengths for heat and momentum and the assumption of a constant flux layer between the surface and the first grid level.
+
+
+== Soil model ==
+
+== Usage ==
+
+== References ==