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- W4364366148 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Leads in the sea ice sheet have been studied extensively because of their climate relevance. In summer, there is an intense heat exchange between the ocean and the atmosphere in the leads. Leads are also preferential melting sites in early summer, but their oceanography and climate relevance, if any, remains largely unexplored during this period of the year. In particular, the development of a near-surface temperature maximum (NSTM) layer at typically 10–30 m deep under different Arctic Basins, has been related observationally to the penetration of solar radiation through the leads. The observations reveal that the concatenation of calm and wind events in the leads could facilitate the development of the NSTM layer. This study investigates, using numerical modelling and an idealized framework, the formation of the NSTM layer under a summer lead exposed to a combination of calm and moderate wind periods. During the calm period, solar heat accumulates in the upper layers under the lead. Near-surface convection cells are generated daily, extending from the lead sides to its center. Convection cells affect the heat storage in the mixed layer under the lead and the adjacent ice cap. A subsequent wind event (and corresponding ice drift) mixes and spreads fresh and cold meltwater into the warm layers near the surface. Surface mixing results in temperatures in the near-surface layers that are lower than in the deeper layers, where the impact of the surface stresses is weaker. Also, the warm waters initially located under the lead surface stretch and spread horizontally. Thus an NSTM layer is formed. The study analyses the sensitivity of depth and temperature of the NSTM layer to buoyancy forcing, wind intensity and ice drift. Numerical results suggest that the NSTM layer appears with moderate wind and ice drift, and disappears when wind intensity is higher than 9 ms<sup>-1</sup>. According to the results, ice drift is key in the development of the NSTM layer." @default.
- W4364366148 created "2023-04-12" @default.
- W4364366148 creator A5027026051 @default.
- W4364366148 date "2023-04-11" @default.
- W4364366148 modified "2023-09-30" @default.
- W4364366148 title "Reply on RC1" @default.
- W4364366148 doi "https://doi.org/10.5194/tc-2022-233-ac1" @default.
- W4364366148 hasPublicationYear "2023" @default.
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