제목: Sea Ice Energy Balance: An Introduction to Observations and Modeling Studies​​​​​​​

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​​​​​​​​​​​​​​​​​​연사: 김주홍 박사 (극지연구소)​​

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장소: 과학관 B102호​​

Abstract:

​​Sea ice energy balance is the input, output, and storage of energy in the sea ice system, which is a key for determining whether the ice will melt, grow, or stay in equilibrium. Changes in the energy balance over time result in sea ice mass balance – net gain or loss of sea ice mass over a given time period, primarily influenced by the processes of accumulation and ablation. In summer of the Arctic, the surface energy balance controls sea ice melt, with melt ponds acting as key modulators of radiative and turbulent fluxes. Here we combine in situ observations by Korean IBRV Araon with SHEBA (1998) and idealized CICE5 experiments to quantify how melt‐pond salinity accelerates ice ablation. Field measurements show that colder saline ponds reduce net outgoing heat fluxes relative to warmer freshwater ponds under the same environment, yielding faster thinning under otherwise similar atmospheric forcing. To represent this process mechanistically, we augment CICE5 with (i) a pond-temperature‐dependent term in the net surface heat loss and (ii) a simple snow–pond salinity coupling. Thirty-year integrations over the pan-Arctic indicate that excluding pond salinity leads to underestimation of melt-pond fraction and summer sea-ice loss. As the Arctic transitions toward thinner, first-year ice that is more permeable to seawater intrusion, salinity-enhanced albedo feedbacks are likely to amplify seasonal melt and its climate impacts. We argue that next-generation sea-ice models should explicitly represent pond and snow salinity effects in the surface energy balance and be constrained by coordinated observations.​