Variability in the global energy budget and transports 1985-2017 - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Climate Dynamics Année : 2020

Variability in the global energy budget and transports 1985-2017

Chunlei Liu
  • Fonction : Auteur
Richard P. Allan
  • Fonction : Auteur
Michael Mayer
  • Fonction : Auteur
Patrick Hyder
  • Fonction : Auteur
Lijing Cheng
  • Fonction : Auteur
Jianjun Xu
  • Fonction : Auteur
Feng Xu
Yu Zhang
  • Fonction : Auteur

Résumé

The study of energy flows in the Earth system is essential for understanding current climate change. To understand how energy is accumulating and being distributed within the climate system, an updated reconstruction of energy fluxes at the top of atmosphere, surface and within the atmosphere derived from observations is presented. New satellite and ocean data are combined with an improved methodology to quantify recent variability in meridional and ocean to land heat transports since 1985. A global top of atmosphere net imbalance is found to increase from 0.10 ± 0.61 W m-2 over 1985-1999 to 0.62 ± 0.1 W m-2 over 2000-2016, and the uncertainty of ± 0.61 W m-2 is related to the Argo ocean heat content changes (± 0.1 W m-2) and an additional uncertainty applying prior to 2000 relating to homogeneity adjustments. The net top of atmosphere radiative flux imbalance is dominated by the southern hemisphere (0.36 ± 0.04 PW, about 1.41 ± 0.16 W m-2) with an even larger surface net flux into the southern hemisphere ocean (0.79 ± 0.16 PW, about 3.1 ± 0.6 W m-2) over 2006-2013. In the northern hemisphere the surface net flux is of opposite sign and directed from the ocean toward the atmosphere (0.44 ± 0.16 PW, about 1.7 ± 0.6 W m-2). The sea ice melting and freezing are accounted for in the estimation of surface heat flux into the ocean. The northward oceanic heat transports are inferred from the derived surface fluxes and estimates of ocean heat accumulation. The derived cross-equatorial oceanic heat transport of 0.50 PW is higher than most previous studies, and the derived mean meridional transport of 1.23 PW at 26° N is very close to 1.22 PW from RAPID observation. The surface flux contribution dominates the magnitude of the oceanic transport, but the integrated ocean heat storage controls the interannual variability. Poleward heat transport by the atmosphere at 30° N is found to increase after 2000 (0.17 PW decade-1). The multiannual mean (2006-2013) transport of energy by the atmosphere from ocean to land is estimated as 2.65 PW, and is closely related to the ENSO variability.
Fichier principal
Vignette du fichier
Liu2020_Article_VariabilityInTheGlobalEnergyBu.pdf (871.74 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03683231 , version 1 (01-06-2022)

Licence

Paternité

Identifiants

Citer

Chunlei Liu, Richard P. Allan, Michael Mayer, Patrick Hyder, Damien Desbruyères, et al.. Variability in the global energy budget and transports 1985-2017. Climate Dynamics, 2020, 55, pp.3381-3396. ⟨10.1007/s00382-020-05451-8⟩. ⟨insu-03683231⟩
12 Consultations
29 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More