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Topics - uniquorn

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Arctic sea ice / Arctic Ocean salinity, temperature and waves
« on: October 04, 2018, 01:05:42 PM »
I thought this topic needed a dedicated thread as comments tend to get lost in the freezing/melting season threads. Fish Out of Water noticed a rapid increase in salinity at 300m on the Mercator Ocean model and questions were raised as to it's validity. Snips and links below
Update on Mercator 300m salinity, aug1-sep30. (every 2days, scale is not static)

Is this still real? And if so, any explanations?

If it was a Kelvin wave from the deep waters, this could change the whole dynamic of the arctic: lowering freezing temps, holding more heat in summer, drawing up a long chain of warmer water? and likely half hidden under the existing pack as it looks to only show around the edges!  Wondering if the 'bobbing effect' of so many smaller bergs might serves as a pump to circulate itself.
<snippage> another possibility is that the saline water is moving across the Beaufort at depth and is backing up in the direction it's coming from and merely leaking into the Beaufort gyre following the shelf bathymetry. That is it's Atl. water.
I think the wind shift caused a coastal Kelvin wave of shoaling of warm salty Atlantic water from depths below 300m up to the 300m level. I have forgotten who suggested it was a Kelvin wave, but I think that's correct because shifts in wind regimes can cause coastal Kelvin waves.
Extraordinary amounts of warm salty Pacific water have been flowing towards the Barrow submarine canyon, but that water hasn't had the time to reach the CAA and loops show that that water may be rotating clockwise towards the Chukchi shelf margins, not the CAA. The warm water that's sinking in the Chukchi region will likely store heat in the water layers above 300m.
Is it likely that long distance waves and, to some extent, tidal movements have been suppressed by thick pack ice and that, as the percentage of open water increases, we will begin to see evidence of larger scale 'bottom mixing' as well as more localised storm driven 'top mixing' of arctic waters?
As the Windy wave image shows, the damping effect of arctic ice appears to be diminishing.
Mercator 300m salinity and temperature, aug1-oct4.
Windy ecmwf waves and SST, oct4

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