Package net.simplace.sim.components.crop.co2

Class Co2InfluenceOnTranspiration

java.lang.Object

net.simplace.sim.model.FWSimComponent

net.simplace.sim.components.crop.co2.Co2InfluenceOnTranspiration

All Implemented Interfaces:

net.simplace.sim.util.FWSimFieldContainer

public class Co2InfluenceOnTranspiration
extends net.simplace.sim.model.FWSimComponent

Reduces the Transpiration due to increasing \(CO_2\) concentration in the atmosphere

\(CO_2\) calculation

The actual \(CO_2\) concentration in the atmosphere is calculated by a linear function based on the \(CO_2\) concentration (cStartValue) in the start year (cStartYear) and the slope (cSlope).

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

Transpiration reduction

Transpiration is reduced by a factor \(f(CO_2)\) that depends linearly on the actual \(CO_2\) concentration by:

\[ \begin{eqnarray} f(CO_2) & = & Transpiration\_m \cdot CO_2 + Transpiration\_b \label{fco2}\\ ReducedTranspiration & = & Transpiration \cdot f(CO_2(year)) \label{redtrans} \end{eqnarray} \]

where \Transpiration\_m\ and \Transpiration\_b\ are the slope and the intercept of the linear function being set to 1.1. and -0.0003 respectively by default. The reduced transpiration is calculated by multiplying the transpiration as determined by crop water demand and soil water supply with the reduction factor \(f(CO_2)\). This value of reduced transpiration is then compared with the potential crop transpiration PTRAN to calculate crop water stress (TRANRF) (e.g. in the SimComponent LintulWaterStress and the impact on crop growth rate.

Remarks

If you want to switch of the \(CO_2\) effect on transpiration (e.g. if you use want to use the same solution with projects to calculate with and without \(CO_2\) effect), then you can parameterize the component, so that the factor is always 1:

• set cTranspiration_m to 0
• set cTranspiration_b to 1

For clarity reasons however, it is recommended to use different solutions and to remove the SimComponent from the solution, if you don't want to calculate \(CO_2\) effect on transpiration.

References

Calculations due to LintulFAST. Further reference needed!

Author:

Gunther Krauss, Andreas Enders

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cSlope	Slope of the linear function calculating the \(CO_2\) concentration in the atmosphere \(\eqref{co2}\)	DOUBLE	ppm/a	0.0	20.0	3.5
constant	cStartValue	Start \(CO_2\) value of the linear function calculating the \(CO_2\) concentration \(\eqref{co2}\)	DOUBLE	ppm	220.0	400.0	350.0
constant	cStartYear	Start year of the linear function calculating the \(CO_2\) concentration \(\eqref{co2}\)	INT	a	1930	2020	1990
constant	cTranspiration_b	Intercept of the linear function calculating the reduction factor \(\eqref{fco2}\)	DOUBLE	1	0.0	20.0	1.1
constant	cTranspiration_m	Slope of the linear function calculating the reduction factor \(\eqref{fco2}\)	DOUBLE	ppm-1	0.0	20.0	-3.0E-4
input	iTranspiration	(Unreduced) transpiration	DOUBLE	mm/d	0.0	20.0	-
out	Transpiration	Reduced transpiration by \(CO_2\) \(\eqref{redtrans}\)	DOUBLE	mm/d	0.0	20.0	-

Nested Class Summary

Nested classes/interfaces inherited from class net.simplace.sim.model.FWSimComponent

net.simplace.sim.model.FWSimComponent.TEST_STATE

Field Summary

Fields inherited from class net.simplace.sim.model.FWSimComponent

iFieldMap, iFrequence, iInputMap, iJexlRule, iMasterComponentGroup, iName, iOrderNumber, isComponentGroup, iSimComponentElement, iSimModel, iVarMap

Constructor Summary

Constructors

Constructor	Description
Co2InfluenceOnTranspiration()	Empty constructor used by class.forName()

Method Summary

Modifier and Type	Method	Description
protected net.simplace.sim.model.FWSimComponent	clone(net.simplace.sim.util.FWSimVarMap aVarMap)
HashMap<String,net.simplace.sim.util.FWSimVariable<?>>	createVariables()	Create the FWSimVariables as interface for this SimComponent
HashMap<String,net.simplace.sim.util.FWSimVariable<?>>	fillTestVariables(int aParamIndex, net.simplace.sim.model.FWSimComponent.TEST_STATE aDefineOrCheck)	called for single component test to check the components algorithm.
protected void	init()	initializes the fields by getting input and output FWSimVariables from VarMap
protected void	process()	Process the algorithm and write the results back to VarMap

Methods inherited from class net.simplace.sim.model.FWSimComponent

addVariable, bind, checkCondition, createSimComponent, createSimComponent, createSimComponent, createSimComponent, doProcess, getConstantVariables, getContentType, getCreateFormXML, getDescription, getEditFormXML, getFieldMap, getFrequence, getFrequenceRuleScript, getInputs, getInputVariables, getMasterComponentGroup, getName, getOrderNumber, getOutputVariables, getVariable, getVariableField, getVarMap, initialize, isConditionCheck, isVariableAvailable, performLinks, performLinks, readInputs, removeVariable, reset, runComponentTest, setVariablesDefault, toComponentLinkingXML, toDocXML, toGroupXML, toOutputDefinitionXML, toResourcesDataXML, toResourcesDefinitionXML, toString, toXML, writeVarInfos

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Co2InfluenceOnTranspiration

public Co2InfluenceOnTranspiration()

Empty constructor used by class.forName()

Method Details

createVariables

public HashMap<String,net.simplace.sim.util.FWSimVariable<?>> createVariables()

Create the FWSimVariables as interface for this SimComponent

Specified by:

createVariables in interface net.simplace.sim.util.FWSimFieldContainer

Specified by:

createVariables in class net.simplace.sim.model.FWSimComponent

See Also:

• FWSimComponent.createVariables()

init

protected void init()

initializes the fields by getting input and output FWSimVariables from VarMap

Specified by:

init in class net.simplace.sim.model.FWSimComponent

See Also:

• FWSimComponent.init()

process

protected void process()

Process the algorithm and write the results back to VarMap

Specified by:

process in class net.simplace.sim.model.FWSimComponent

See Also:

• FWSimComponent.process()

fillTestVariables

public HashMap<String,net.simplace.sim.util.FWSimVariable<?>> fillTestVariables(int aParamIndex,
 net.simplace.sim.model.FWSimComponent.TEST_STATE aDefineOrCheck)

called for single component test to check the components algorithm.

Specified by:

fillTestVariables in class net.simplace.sim.model.FWSimComponent

See Also:

• net.simplace.sim.util.FWSimFieldContainer#fillTestVariables(int aParamIndex, TEST_STATE aDefineOrCheck)

clone

protected net.simplace.sim.model.FWSimComponent clone(net.simplace.sim.util.FWSimVarMap aVarMap)

Specified by:

clone in class net.simplace.sim.model.FWSimComponent

See Also:

• FWSimComponent.clone(net.simplace.sim.util.FWSimVarMap)