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IMPACT Model — Driver Assumptions Metadata

Model version: v4.1.4
Scenario: SSP2-NoCC-NoCC
Generated: April 2026

Domain set elements are listed separately in domain_sets.csv.

Table of Contents

BaseYearData
ClimateImpacts_Yield
Elasticities_Demand
Elasticities_Supply
ProductionGrowth_Area
ProductionGrowth_Yield
Socioeconomic
Trade_Parameters
Demand
Supply

BaseYearData

`BaseCTY`

Field	Value
Type	Parameter
Description	Loading parameter for cty-level entropy results
Domain	`JJJ`, `CTY`, `RIQ`

`BaseCTY_Fish`

Field	Value
Type	Parameter
Description	Loading base year data for fish
Domain	`CTY`, `AC`, `RIQ`

`BaseFPU`

Field	Value
Type	Parameter
Description	Loading parameter for FPU-level crop area-yield-QS
Domain	`J`, `FPU`, `LND`, `RIQFPU`

`BaseFPUL`

Field	Value
Type	Parameter
Description	Loading parameter for FPU-level livestock number-yield-QS
Domain	`J`, `FPU`, `LVSYS`, `RIQFPU`

ClimateImpacts_Yield

`RdInCCdelta`

Field	Value
Type	Parameter
Description	CC deltas adjusted to be a multiplier for IMPACT 3
Domain	`gcm`, `rcp`, `CropModel`, `Technology`, `J`, `FPU`, `LND`

Elasticities_Demand

`BFDmdPElas`

Field	Value
Type	Parameter
Description	Biofuels Demand Price Elasticity
Domain	`C`, `CC`, `CTY`

`ExogFDDmdElasH`

Field	Value
Type	Parameter
Description	Exogenous trend for household own-price elasticities for food demand
Domain	`C`, `H`, `CTY`, `YRS`

`ExogIncDmdElasH`

Field	Value
Type	Parameter
Description	Exogenous trend for household income elasticities for food demand
Domain	`C`, `H`, `CTY`, `YRS`

`FdElasHX0`

Field	Value
Type	Parameter
Description	Final Household food demand elasticities
Domain	`C`, `CC`, `H`, `CTY`, `YRS`

`FeedElas`

Field	Value
Type	Parameter
Description	Livestock feed demand elasticity
Domain	`C`, `CC`, `CTY`

`IncDmdElasHX0`

Field	Value
Type	Parameter
Description	Final Household income demand elasticities
Domain	`C`, `H`, `CTY`, `YRS`

`OthDmdIElas`

Field	Value
Type	Parameter
Description	Other demand income elasticity
Domain	`C`, `CTY`

`OthDmdPElas`

Field	Value
Type	Parameter
Description	Other demand price elasticity
Domain	`C`, `CC`, `CTY`

Elasticities_Supply

`AnmlFeedElas`

Field	Value
Type	Parameter
Description	Animal feed elasticity of supply
Domain	`J`, `C`, `CTY`

`AreaElas`

Field	Value
Type	Parameter
Description	Area supply elasticities wrt to PNET
Domain	`JJJ`, `FPU`, `LND`

`AnmlElas`

Field	Value
Type	Parameter
Description	Animal stock supply elasticities
Domain	`J`, `JJ`, `CTY`

`YldElas`

Field	Value
Type	Parameter
Description	Yield elasticity wrt to land price
Domain	`JJJ`, `FPU`, `LND`

`YldElasWF`

Field	Value
Type	Parameter
Description	Yield elasticity wrt to other input prices
Domain	`JJJ`, `FPU`, `LND`, `FCTR`

`QSElas`

Field	Value
Type	Parameter
Description	Supply price elasticities
Domain	`J`, `J`, `CTY`

`QSElasC`

Field	Value
Type	Parameter
Description	Supply price elasticities for inputs
Domain	`C`, `J`, `CTY`

`WFElas`

Field	Value
Type	Parameter
Description	FPU land demand elasticity wrt WFV
Domain	`J`, `FPU`, `FCTR`

`pop05`

Field	Value
Type	Parameter
Description	Percent of the population that are between 0 and 5 (decimal)
Domain	`SSP`, `CTY`, `YRS`

ProductionGrowth_Area

`areagr`

Field	Value
Type	Parameter
Description	Exogenous 5-yr area growth by FPU and land type
Domain	`JJJ`, `FPU`, `LND`, `YRPER`

`anmlnumgrx0`

Field	Value
Type	Parameter
Description	Exogenous growth rates for livestock herd size
Domain	`J`, `FPU`, `LVSYS`, `YRS`

`lndgr`

Field	Value
Type	Parameter
Description	Exogenous 5-yr land growth by FPU and land type
Domain	`FPU`, `LND`, `YRPER`

ProductionGrowth_Yield

`yldgr`

Field	Value
Type	Parameter
Description	Exogenous 5-yr yield growth by FPU and land type
Domain	`JJJ`, `FPU`, `LND`, `YRPER`

`anmlyldgrx0`

Field	Value
Type	Parameter
Description	Exogenous productivity growth for livestock yield
Domain	`J`, `FPU`, `LVSYS`, `YRS`

`yldbumpx0`

Field	Value
Type	Parameter
Description	Additional bump growth to IPRs
Domain	`FPU`, `YRS`

Socioeconomic

`RdInGDPSSP`

Field	Value
Type	Parameter
Description	Total GDP for IMPACT
Domain	`MOD`, `PROJ`, `CTY`, `YRS`

`GDPSSPgr`

Field	Value
Type	Parameter
Description	Exogenous annual GDP growth rates
Domain	`SCENARIO`, `CTY`, `YRS`

`RdInPOPSSP`

Field	Value
Type	Parameter
Description	Total Population for IMPACT
Domain	`MOD`, `PROJ`, `CTY`, `YRS`

`POPSSPgr`

Field	Value
Type	Parameter
Description	Exogenous annual population growth rates
Domain	`SCENARIO`, `CTY`, `YRS`

Trade_Parameters

`RdInCSE`

Field	Value
Type	Parameter
Description	Consumer subsidy equivalent from GFACTCOM
Domain	`CTY`, `C`

`PW00`

Field	Value
Type	Parameter
Description	Base year world price
Domain	`C`

`RdInMM`

Field	Value
Type	Parameter
Description	Marketing margins from GFACTCOM
Domain	`CTY`, `C`

`RdInMME`

Field	Value
Type	Parameter
Description	Marketing margins for exports based on price wedge calculations
Domain	`C`, `CTY`

`RdInMMJ`

Field	Value
Type	Parameter
Description	Marketing margins from farmgate based on price wedge calculations
Domain	`JJJ`, `CTY`

`RdInMMM`

Field	Value
Type	Parameter
Description	Marketing margins for imports based on price wedge calculations
Domain	`C`, `CTY`

`RdInPSE`

Field	Value
Type	Parameter
Description	Producer subsidy equivalent from GFACTCOM
Domain	`CTY`, `JJJ`

`TE`

Field	Value
Type	Parameter
Description	Export taxes
Domain	`C`, `CTY`

`TM`

Field	Value
Type	Parameter
Description	Import tariffs
Domain	`C`, `CTY`

Demand

`WasteInt`

Field	Value
Type	Parameter
Description	Household food waste multiplier
Domain	`C`, `CTY`

`RdInFeedReq`

Field	Value
Type	Parameter
Description	Livestock feed requirements
Domain	`C`, `CTY`, `J`

`QBFInt2`

Field	Value
Type	Parameter
Description	Biofuel demand multiplier
Domain	`C`, `CTY`

`QOthrInt2`

Field	Value
Type	Parameter
Description	Other demand multiplier
Domain	`C`, `CTY`

Supply

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