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Article Dans Une Revue Bulletin of the American Meteorological Society Année : 2021

Closing the Water Cycle from Observations across Scales: Where Do We Stand?

Wouter Dorigo
  • Fonction : Auteur
Stephan Dietrich
Luca Brocca
Sarah Carter
  • Fonction : Auteur
David Dunkerley
  • Fonction : Auteur
Hiroyuki Enomoto
  • Fonction : Auteur
René Forsberg
  • Fonction : Auteur
Andreas Güntner
  • Fonction : Auteur
Michaela I. Hegglin
  • Fonction : Auteur
Rainer Hollmann
  • Fonction : Auteur
Dale F. Hurst
  • Fonction : Auteur
Johnny A. Johannessen
  • Fonction : Auteur
Christian Kummerow
  • Fonction : Auteur
Tong Lee
  • Fonction : Auteur
Kari Luojus
  • Fonction : Auteur
Ulrich Looser
  • Fonction : Auteur
Diego G. Miralles
  • Fonction : Auteur
Victor Pellet
Thomas Recknagel
  • Fonction : Auteur
Claudia Ruz Vargas
  • Fonction : Auteur
Udo Schneider
  • Fonction : Auteur
Marc Schröder
  • Fonction : Auteur
Nigel Tapper
  • Fonction : Auteur
Valery Vuglinsky
  • Fonction : Auteur
Wolfgang Wagner
Lisan Yu
  • Fonction : Auteur
Luca Zappa
Michael Zemp
  • Fonction : Auteur
Valentin Aich
  • Fonction : Auteur

Résumé

Life on Earth vitally depends on the availability of water. Human pressure on freshwater resources is increasing, as is human exposure to weather-related extremes (droughts, storms, floods) caused by climate change. Understanding these changes is pivotal for developing mitigation and adaptation strategies. The Global Climate Observing System (GCOS) defines a suite of essential climate variables (ECVs), many related to the water cycle, required to systematically monitor Earth's climate system. Since long-term observations of these ECVs are derived from different observation techniques, platforms, instruments, and retrieval algorithms, they often lack the accuracy, completeness, and resolution, to consistently characterize water cycle variability at multiple spatial and temporal scales. Here, we review the capability of ground-based and remotely sensed observations of water cycle ECVs to consistently observe the hydrological cycle. We evaluate the relevant land, atmosphere, and ocean water storages and the fluxes between them, including anthropogenic water use. Particularly, we assess how well they close on multiple temporal and spatial scales. On this basis, we discuss gaps in observation systems and formulate guidelines for future water cycle observation strategies. We conclude that, while long-term water cycle monitoring has greatly advanced in the past, many observational gaps still need to be overcome to close the water budget and enable a comprehensive and consistent assessment across scales. Trends in water cycle components can only be observed with great uncertainty, mainly due to insufficient length and homogeneity. An advanced closure of the water cycle requires improved model-data synthesis capabilities, particularly at regional to local scales.
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insu-03671323 , version 1 (18-05-2022)

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Wouter Dorigo, Stephan Dietrich, Filipe Aires, Luca Brocca, Sarah Carter, et al.. Closing the Water Cycle from Observations across Scales: Where Do We Stand?. Bulletin of the American Meteorological Society, 2021, 102, pp.E1897-E1935. ⟨10.1175/BAMS-D-19-0316.1⟩. ⟨insu-03671323⟩
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