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Quote from: interstitial on August 06, 2020, 06:57:08 AMLooking at piomas model I see ice thinning by 1 m between 4/15 and 7/15. In less central locations the ice thins 1.25 m while in more central locations the ice thins by 0.75m. That is a melt rate of 8mm to 14mm per day. I also looked at Hycom on the same dates and came up with similar numbers. 7/15 includes about 4 weeks after the solstice. We are now almost three weeks beyond that. We are getting close to the time when the CAB normally starts to refreeze. The Beaufort will probably melt to the end. Thanks for your interesting post interstitial. A few notes:* The CAB continues to accumulate volume until May 5th-10th, at least according to PIOMAS.* Peak volume loss rate is between mid-June and end-July. Using Wipneus regional numbers, an area of ~4M km2 loses ~4000 km3, so about 1m over 6 weeks, roughly 2.5 cm/day. Of course this mixes up top melt, bottom melt and export/import.
Looking at piomas model I see ice thinning by 1 m between 4/15 and 7/15. In less central locations the ice thins 1.25 m while in more central locations the ice thins by 0.75m. That is a melt rate of 8mm to 14mm per day. I also looked at Hycom on the same dates and came up with similar numbers. 7/15 includes about 4 weeks after the solstice. We are now almost three weeks beyond that. We are getting close to the time when the CAB normally starts to refreeze. The Beaufort will probably melt to the end.
On our transects – regular walks across the floe ... We recorded a gradual decrease in the average ice thickness: a drop of approximately one metre over the course of July.
...ablation stakes allow us to distinguish between the melting below and melting above. ... We measured an average of ~85cm of ice thinning across our stakes sites from 26 June to 30 July. Surface ablation accounted for seventy-five percent of that thinning, while bottom melting made up the remaining twenty-five percent.
The remotely operated underwater vehicle (ROV) “Beast” surveys the ice from below ... Comparing the maps produced over several dives showed that not all the ice melted at the same speed. Especially the deep keels that extended more than 8 metres into the comparably “warm” ocean were eroding quickly. In some parts of the ridged ice, keel depth decreased by up to 2 metres in just the first 14 days.
It seems the Navy Lab has discontinued ice concentration updates of HYCOM
Do you have a link to that, because here is what I'm using (I'm looking for ice thickness, sorry) and it stops at Nov 2, 2020https://www7320.nrlssc.navy.mil/GLBhycomcice1-12/navo/arcticictn_nowcast_anim30d.gifKinda coincidence that it stopped on election day.
And now it works!
