Salinity control of thermal evolution of late summer melt ponds on Arctic sea ice
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The thermal evolution of melt ponds on Arctic sea ice was investigated through a combination of autonomous observations and two-dimensional high-resolution fluid dynamics simulations. We observed one relatively fresh pond and one saline pond on the same ice floe, with similar depth. The comparison of observations and simulations indicates that thermal convection dominates in relatively fresh ponds, but conductive heat transfer dominates in salt-stratified ponds. Using a parameterized surface energy balance, we estimate that the heat flux to the ice is larger under the saline pond than the freshwater pond when averaged over the observational period. The deviation is sensitive to assumed wind, varying between 3 and 14 W/m2 for winds from 0 to 5 m/s. If this effect persists as conditions evolve through the melt season, our results suggest that this imbalance potentially has a climatologically significant impact on sea-ice evolution.
Kim , J H , Moon , W , Wells , A J , Wilkinson , J P , Langton , T , Hwang , B , Granskog , M A & Rees Jones , D W 2018 , ' Salinity control of thermal evolution of late summer melt ponds on Arctic sea ice ' Geophysical Research Letters , vol. 45 , no. 16 , pp. 8304-8313 . https://doi.org/10.1029/2018GL078077
Geophysical Research Letters
© 2018, American Geophysical Union. This work has been made available online in accordance with the publisher's policies. This is the final published version of the work, which was originally published at https://doi.org/10.1029/2018GL078077
DescriptionFunding: A.J.W. and D.R.J. acknowledge support from the John Fell Oxford University Press Research Fund and thank the Isaac Newton Institute for Mathematical Sciences for hospitality (EPSRC Grant EP/K032208/1).
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