Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session A17: Convection and Buoyancy-Driven Flows: General I
8:00 AM–9:57 AM,
Sunday, November 19, 2023
Room: 145B
Chair: Harish Ganesh, University of Michigan
Abstract: A17.00008 : Ponds in melting ice: bistability in radiatively heating
9:31 AM–9:44 AM
Presenter:
Roberto Verzicco
(Univ of Roma Tor Vergata)
Authors:
Roberto Verzicco
(Univ of Roma Tor Vergata)
Rui Yang
(University of Twente)
Christopher J Howland
(Univ of Twente)
Hao-Ran Liu
(University of Science and Technology of China | USTC · Department of Modern Mechanics)
Detlef Lohse
(University of Twente)
In particular, understanding the formation of melt ponds, initiated by solar radiation has great implications as the total albedo is significantly lowered thus further increasing the overall melting rate. Through direct numerical simulations and theoretical analysis, we unveil a bistability phenomenon in melt pond dynamics. As solar radiation intensity and initial pond depth vary, an abrupt transition occurs (also referred to as a tipping point) transforming the system from a fully frozen to an equilibrium state characterized by a distinct melt pond depth.
We elucidate the mechanism of this transition by the heat flux mismatch between ice and water and propose a theoretical model based on heat flux balance, which shows excellent agreement with our numerical results. Moreover, we employ our model to predict the bulk temperature and flow strength within melt ponds, offering insights into the coupling of phase transitions with convective flows.
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