The “Supermoon” on November 14th coincided with the closest (perigean) approach to the earth of the moon since 1948. Tidal forces are inversely proportional to the cube of distance. Full moon occurs when the sun lines up with the moon and November 14th is also close to the perigee of the earth’s orbit round the sun. This combined to produce strong tides. At full moon in November the moon lies in the southern hemisphere . So for the Arctic it is the opposite facing tides that is strongest while for the Antarctic it is the direct lunar facing tide that dominates. They are symmetric. Here are my calculations of the tractional acceleration at different latitude covering November, based on the JPL ephemeris.
It is the tidal range that is maximised during a perigean spring tide. That is the difference between low and high tides. At high latitudes this effect is magnified as just one tide dominates and neap tides effectively disappear completely. This gives an extreme varying monthly tidal range. Tides act throughout the ocean, dragging both deep and shallow water alike. This increasing churning tidal flow since October has had two effects. First it has inhibited natural sea ice formation, and secondly mixed in more warmer water from lower latitudes than normal. These large tidal ranges look likely to continue till the end of 2016 before returning to normal.
The Arctic ocean also has relatively shallow basins with narrow channels at the Bering Sea and to the North Atlantic between Iceland-Scandinavia. This accentuates tidal flow.
Thanks to @Kata_basis for prompting me to look into this !
- Does the moon trigger interglacials
- Evidence of tidal effect on the polar jet stream
- Tidal effects in Polar regions
- The straw that broke the camels back