Irrigated areas drive irrigation water withdrawals.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
26 07 2021
26 07 2021
Historique:
received:
08
12
2020
accepted:
21
06
2021
entrez:
27
7
2021
pubmed:
28
7
2021
medline:
28
7
2021
Statut:
epublish
Résumé
A sustainable management of global freshwater resources requires reliable estimates of the water demanded by irrigated agriculture. This has been attempted by the Food and Agriculture Organization (FAO) through country surveys and censuses, or through Global Models, which compute irrigation water withdrawals with sub-models on crop types and calendars, evapotranspiration, irrigation efficiencies, weather data and irrigated areas, among others. Here we demonstrate that these strategies err on the side of excess complexity, as the values reported by FAO and outputted by Global Models are largely conditioned by irrigated areas and their uncertainty. Modelling irrigation water withdrawals as a function of irrigated areas yields almost the same results in a much parsimonious way, while permitting the exploration of all model uncertainties. Our work offers a robust and more transparent approach to estimate one of the most important indicators guiding our policies on water security worldwide.
Identifiants
pubmed: 34312386
doi: 10.1038/s41467-021-24508-8
pii: 10.1038/s41467-021-24508-8
pmc: PMC8313559
doi:
Types de publication
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
4525Informations de copyright
© 2021. The Author(s).
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