authority: gcos
slug: fapar
name: Fraction of Absorbed Photosynthetically Active Radiation
domain: land
subdomain: biosphere
authority_id: gcos:fapar
external_ids:
  nvs_uri: null
  cf_standard_name: fraction_of_absorbed_photosynthetically_active_radiation
  iadopt_concepts:
    property: fraction
    entity: photosynthetically-active-radiation
canonical_units: "1"
gcos_requirement_tier:
  threshold: null
  breakthrough: null
  goal: null
description: |
  Fraction of incoming PAR (400-700 nm) absorbed by the green vegetation
  canopy, derived from MODIS, VIIRS, Sentinel-3 OLCI and PROBA-V. A core
  driver of gross primary production estimates.
theme: vegetation
demos: []
status: documented
sources:
  - https://gcos.wmo.int/site/global-climate-observing-system-gcos/essential-climate-variables/fraction-of-absorbed-photosynthetically-active-radiation