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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2017

Rainforest-initiated wet season onset over the southern Amazon

Jonathon S. Wright
  • Fonction : Auteur
Rong Fu
  • Fonction : Auteur
John R. Worden
  • Fonction : Auteur
Sudip Chakraborty
  • Fonction : Auteur
Nicholas E. Clinton
  • Fonction : Auteur
Ying Sun
  • Fonction : Auteur
Lei Yin
  • Fonction : Auteur

Résumé

This analysis provides compelling observational evidence that rainforest transpiration during the late dry season plays a central role in initiating the dry-to-wet season transition over the southern Amazon. Transpiration first activates shallow convection that preconditions the atmosphere for regional-scale deep convection, rather than directly activating deep convection as previously proposed. Isotopic fingerprints in atmospheric moisture unequivocally identify rainforest transpiration as the primary moisture source for shallow convection during the transition. This "shallow convection moisture pump" thus depends on high transpiration rates during the late dry season, affirming the potential for climate and land use changes to alter or disrupt wet season onset in this region.

Dates et versions

insu-03727055 , version 1 (19-07-2022)

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Citer

Jonathon S. Wright, Rong Fu, John R. Worden, Sudip Chakraborty, Nicholas E. Clinton, et al.. Rainforest-initiated wet season onset over the southern Amazon. Proceedings of the National Academy of Sciences of the United States of America, 2017, 114, pp.8481-8486. ⟨10.1073/pnas.1621516114⟩. ⟨insu-03727055⟩
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