Historical global map of NH4+ and NO3- application in synthetic nitrogen fertilizer, link to NetCDF files
type: Dataset
creator: Kazuya Nishina
creator: Akihiko Ito
creator: Naota Hanasaki
  type: Person
  family name: Hanasaki
  given name: Naota
creator: Seiji Hayashi
  type: Person
  family name: Hayashi
  given name: Seiji
publisher: PANGAEA
  type: Organization
  disambiguating description: Data Publisher for Earth & Environmental Science
included in data catalog: PANGAEA
  type: DataCatalog
  disambiguating description: Data Publisher for Earth & Environmental Science
date published: 2017
description: This paper provides a method for constructing a new historical global nitrogen fertilizer application map (0.5° × 0.5° resolution) for the period 1961-2010 based on country-specific information from Food and Agriculture Organization statistics (FAOSTAT) and various global datasets. This new map incorporates the fraction of NH+4 (and NONO-3) in N fertilizer inputs by utilizing fertilizer species information in FAOSTAT, in which species can be categorized as NH+4 and/or NO-3-forming N fertilizers. During data processing, we applied a statistical data imputation method for the missing data (19 % of national N fertilizer consumption) in FAOSTAT. The multiple imputation method enabled us to fill gaps in the time-series data using plausible values using covariates information (year, population, GDP, and crop area). After the imputation, we downscaled the national consumption data to a gridded cropland map. […]
abstract: This paper provides a method for constructing a new historical global nitrogen fertilizer application map (0.5° × 0.5° resolution) for the period 1961-2010 based on country-specific information from Food and Agriculture Organization statistics (FAOSTAT) and various global datasets. This new map incorporates the fraction of NH+4 (and NONO-3) in N fertilizer inputs by utilizing fertilizer species information in FAOSTAT, in which species can be categorized as NH+4 and/or NO-3-forming N fertilizers. During data processing, we applied a statistical data imputation method for the missing data (19 % of national N fertilizer consumption) in FAOSTAT. The multiple imputation method enabled us to fill gaps in the time-series data using plausible values using covariates information (year, population, GDP, and crop area). After the imputation, we downscaled the national consumption data to a gridded cropland map. Also, we applied the multiple imputation method to the available chemical fertilizer species consumption, allowing for the estimation of the NH+4/NO-3 ratio in national fertilizer consumption. In this study, the synthetic N fertilizer inputs in 2000 showed a general consistency with the existing N fertilizer map (Potter et al., 2010, doi:10.1175/2009EI288.1) in relation to the ranges of N fertilizer inputs. Globally, the estimated N fertilizer inputs based on the sum of filled data increased from 15 Tg-N to 110 Tg-N during 1961-2010. On the other hand, the global NO-3 input started to decline after the late 1980s and the fraction of NO-3 in global N fertilizer decreased consistently from 35 % to 13 % over a 50-year period. NH+4 based fertilizers are dominant in most countries; however, the NH+4/NO-3 ratio in N fertilizer inputs shows clear differences temporally and geographically. This new map can be utilized as an input data to global model studies and bring new insights for the assessment of historical terrestrial N cycling changes.
size: QuantitativeValue
  value: 32.5
  unit text: MBytes
comment: last update: 2017-07-26
license: https://creativecommons.org/licenses/by/3.0/
conditions of access: unrestricted
is accessible for free: true
language: en
distribution: DataDownload
  encoding format: application/zip

Kazuya Nishina
type: Person
family name: Nishina
given name: Kazuya

Akihiko Ito
type: Person
family name: Ito
given name: Akihiko

Reconstruction of spatially detailed global map of NH4+ and NO3- application in synthetic nitrogen fertilizer
type: CreativeWork
type: PublicationIssue
creator: Kazuya Nishina
creator: Akihiko Ito
creator: Naota Hanasaki
  type: Person
  family name: Hanasaki
  given name: Naota
creator: Seiji Hayashi
  type: Person
  family name: Hayashi
  given name: Seiji
date published: 2017
issue number: 9(1)
pagination: 149-162
is part of: Earth System Science Data
is based on: Historical global map of NH4+ and NO3- application in synthetic nitrogen fertilizer, link to NetCDF files