NMIP

Global Land Nitrogen Budget (N) – Model Intercomparison Project (MIP)

The Global Nitrogen Model Inter-comparison Project Protocol

NMIP (The global Nitrogen/N2O Model Inter-comparison Project) is an international partnership of model-model and data-model intercomparison under the umbrella of the Global Carbon Project (GCP) and International Nitrogen Initiative (INI).

Goals

  • The Primary Goal of the NMIP-2 is to focus on the quantification and attribution of N2O emissions, which includes the objectives as follows: 1) to provide more reliable estimates of regional (and/or national) and global soil N2O emissions with an update to the year 2019/2020, covering a period of 1850-2020, 2) to attribute soil N2O emissions to anthropogenic nitrogen addition and other factors, and 3) to provide an estimate of indirect N2O emission from N leaching to inland water systems (River, Lakes and Reservoir)
  • The Secondary Goal of NMIP-2 is to better understand the terrestrial nitrogen cycle and its interactions with other factors, which includes the objective as follows: 1) to provide an assessment of the global terrestrial nitrogen budget, 2) to understand and quantify N-Nexus: how do anthropogenic N inputs affect carbon (C sink), water (N loading), air (NH3 and NOx) and crop yield

Simulations

HistoricalClimateCO2Land coverIrrigationNdepNferManureN
SH01901-1920185018501850185018501850
SH11850-20201850-20201850-20201850-20201850-20201850-20201850-2020
SH21850-20201850-20201850-20201850-20201850-20201850-20201850
SH31850-20201850-20201850-20201850-20201850-202018501850-2020
SH41850-20201850-20201850-20201850-202018501850-20201850-2020
SH51850-20201850-20201850-202018501850-20201850-20201850-2020
SH61850-20201850-202018501850-20201850-20201850-20201850-2020
SH71850-202018501850-20201850-20201850-20201850-20201850-2020
SH81901-20201850-20201850-20201850-20201850-20201850-20201850-2020
SH91901-202018501850185018501850-20201850-2020
SH101850-2020185018501850185018501850

Required output variables

Nitrogen-related variables
Long nameUnitOutput variable nameFrequencyLevel
Nitrogen fluxes
N2O emissionkg m-2 s-1 fN2OMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
N2O emission from inland
waters (Indirect emission)
kg m-2 s-1 fN2OiwMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
N leachingkg m-2 s-1 fNleachMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Biological N fixationkg m-2 s-1 fBNFMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Nitrification ratekg m-2 s-1fNnitriMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Denitrification ratekg m-2 s-1 fNdenitriMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Net N mineralizationkg m-2 s-1fNnetminMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Plant N uptakekg m-2 s-1fNupMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
NH3 volatilizationkg m-2 s-1 fNH3volMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Harvest Nkg m-2 s-1 fNHarvestMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Grazed N kg m-2 s-1fNGrazingMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
N2 emissionkg m-2 s-1fN2Monthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
NOx emissionskg m-2 s-1fNOxMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
N export to oceankg m-2 s-1 fNland_oceanMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Nitrogen pools
Nitrogen in soilkg m-2 nSoilAnnual (1850-2020)Grid-level
Nitrogen in vegetationkg m-2 nVegAnnual (1850-2020)Grid-level
Nitrogen in litterkg m-2 nLitterAnnual (1850-2020) Grid-level
Nitrogen in productskg m-2 nProductAnnual (1850-2020)Grid-level
Carbon-related variables
Long nameUnitOutput variable nameFrequencyLevel
Carbon fluxes
Gross primary productionkg m-2 s-1 gppMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Autotrophic respirationkg m-2 s-1 raMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Net primary productionkg m-2 s-1npp Monthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Heterotrophic respirationkg m-2 s-1 rhMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Net Biome Productionkg m-2 s-1nepMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Harvest Ckg m-2 s-1cHarvestMonthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Grazed Ckg m-2 s-1cGrazing Monthly (1980-2020)
Annual (1850-2020)
Grid- and
biome-levels
Carbon pools
Carbon in soilkg m-2cSoilAnnual (1850-2020)Grid-level
Carbon in vegetationkg m-2cVeg Annual (1850-2020)Grid-level
Carbon in litterkg m-2cLitterAnnual (1850-2020)Grid-level
Carbon in products kg m-2cProductAnnual (1850-2020) Grid-level
References
  • Tian, H., Yang, J., Lu, C., Xu, R., Canadell, J.G., Jackson, R.B., Arneth, A., Chang, J., Chen, G., Ciais, P. and Gerber, S., 2018. The global N 2 O model intercomparison project. Bulletin of the American Meteorological Society, 99(6), pp.1231-1251. https://doi.org/10.1175/BAMS-D-17-0212.1