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Moist energetics of tropical circulations and their coupling to precipitation and radiative feedbacks

 

Moist energetics of tropical circulations and

their coupling to precipitation and

radiative feedbacks

 

Martedì 17/04/2018 ore 14:00 — Aula Rasetti

Dipartimento di Fisica – Edificio Marconi, 2°piano 

 

Important advances have been made in the past decade in our theoretical

understanding of controls on tropical precipitation. An emerging framework

emphasizes the atmospheric energy balance as more fundamental than the

traditional surface energetic perspective to understanding how the zonallyaveraged

Intertropical Convergence Zone (ITCZ) responds to radiative and

surface energy flux perturbations. In this talk, I will discuss how this energetic

perspective also provides strong constraints on monsoon circulations and

associated convergence zones, which, while zonally localized, project strongly

on the solstitial Hadley circulation. Numerical experiments with increasing

complexity allow to shed light into the fundamental workings of monsoons and

call for a reassessment of their driving mechanisms.