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net.simplace.client.simulation.lap.Co2InfluenceOnLUE

Calculates LUE in dependence CO2.

\(CO_2\) calculation

The actual \(CO_2\) is calculated by a linear function

\[ \begin{equation} CO_2(Year) = Slope \cdot (Year-StartYear) + StartValue \label{co2} \end{equation} \]

LUE curve

The LUE is calculated in dependence of CO2 by the formula:

\[ \begin{eqnarray} \lambda & = & 100 g MJ^{-1} \\ LUE(CO_2) & = & \lambda \frac{CO_2}{CO_2 +b_1 e^{-b_2 CO_2}} \label{lue} \end{eqnarray} \]

Reference:

Stockle, C.O., Williams, J.R., Rosenberg, N.J., Jones, C.A., 1992. A method for estimating the direct and climatic effects of rising atmospheric carbon dioxide on growth and yield of crops, Agr. Sys. 38 (3), 225–238. See http://dx.doi.org/10.1016/0308-521X(92)90067-X

LUE calculation

Finally the LUE-curve is stretched by a factor so that it meets the reference values

\[ \begin{eqnarray} f & = & \frac{LUE(ReferenceCO_2Value)}{ReferenceLueValue} \label{factor} \\ LUE & = & LUE(CO_2(Year)) \cdot f \label{finallue} \end{eqnarray} \]

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cReferenceCo2Value	Used to rescale the curve to meet the reference point \(\eqref{factor}\).	DOUBLE	ppm	0.0	2000.0	350.0
constant	cReferenceLueValue	Used to rescale the curve to meet the reference point \(\eqref{factor}\).	DOUBLE	g/MJ	0.0	10.0	3.0
constant	cSlope	Slope to calculate CO2 amount of given year by linear function in \(\eqref{co2}\).	DOUBLE	ppm/a	-1000.0	1000.0	3.5
constant	cStartValue	Reference CO2 amount of the StartYear, starting point of the line \(\eqref{co2}\)	DOUBLE	ppm	0.0	2000.0	350.0
constant	cStartYear	Reference year, starting point of the line \(\eqref{co2}\)	INT	a	0	10000	1990
constant	c_b1	Parameter \(b_1\) to dertemine the shape of curve \(\eqref{lue}\)	DOUBLE	1	0.0	1000000.0	6928.0
constant	c_b2	Parameter \(b_2\) to determine the shape of curve \(\eqref{lue}\)	DOUBLE	1	-10.0	10.0	-0.0014
LUE	Light use efficiency dependend on \(CO_2\) \(\eqref{finallue}\)	DOUBLE	g/MJ	null

public class Co2InfluenceOnLUE extends
net.simplace.simulation.model.FWSimComponent {
// Public Constructors
public Co2InfluenceOnLUE();

// Public Instance Methods

public HashMap createVariables(); // Defines
net.simplace.simulation.model.FWSimComponent

create the FWSimVariables as interface for this SimComponent

// Protected Instance Methods

protected void init(); // Defines
net.simplace.simulation.model.FWSimComponent

initializes the fields by getting input and output FWSimVariables from VarMap

protected void process(); // Defines
net.simplace.simulation.model.FWSimComponent

process the algorithm and write the results back to VarMap

protected FWSimComponent clone(FWSimVarMap aVarMap);
// Defines net.simplace.simulation.model.FWSimComponent

creates a clone from this SimComponent for use in other threads

}

Hierarchy: java.lang.Object - net.simplace.simulation.model.FWSimComponent (net.simplace.simulation.util.FWSimFieldContainer) - Co2InfluenceOnLUE