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(a–d) Temperature time series displaying an oscillating ridge for a model in RO regime. Green arrows point at the ridge structure. (e) An example of a resurfacing event for a model in the mobile lid regime (see red arrows). (bottom left) Top Nusselt numbers obtained for cases assuming basal heating using V = 3.4012. The temperature fields (see Figures 2a–2e) correspond to important times in the Nusselt number plot.
