The role of baroclinic activity in controlling Earth's albedo in the present and future climates - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2023

The role of baroclinic activity in controlling Earth's albedo in the present and future climates

Or Hadas
  • Fonction : Auteur
George Datseris
  • Fonction : Auteur
Joaquin Blanco
  • Fonction : Auteur
Rodrigo Caballero
  • Fonction : Auteur
Bjorn Stevens
  • Fonction : Auteur
Yohai Kaspi
  • Fonction : Auteur

Résumé

We find a strong connection between the magnitude of midlatitude storminess and cloud-albedo, thereby linking the large-scale circulation to the planetary albedo. We use this linkage to propose a mechanism for the observed similarity in reflected sunlight between the two hemispheres: The presence of more ocean causes the southern-hemisphere to absorb more sunlight; however, it also makes it stormier, increasing cloud-albedo and balancing the difference in reflected sunlight. Due to the changes in storminess predicted by CMIP6 models, this link also implies less cloud-albedo with warming and a possible break of hemispheric albedo symmetry. For this symmetry to persist, the distribution of southern-hemisphere storms should shift to fewer but stronger storms, as predicted by climate-change models.
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Dates et versions

insu-04196542 , version 1 (05-09-2023)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Or Hadas, George Datseris, Joaquin Blanco, Sandrine Bony, Rodrigo Caballero, et al.. The role of baroclinic activity in controlling Earth's albedo in the present and future climates. Proceedings of the National Academy of Sciences of the United States of America, 2023, 120, ⟨10.1073/pnas.2208778120⟩. ⟨insu-04196542⟩
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