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Messages - kynde

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Arctic sea ice / Re: The 2020 melting season
« on: July 28, 2020, 07:06:14 PM »
Shore structures, houses and garages provide an easy way to estimate wave heights.

For those that break yes, but from them it's hard to deduce what the wave height is offshore which what the forecasts are about and what we're also interested in. It's called shoaling.

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Arctic sea ice / Re: The 2020 melting season
« on: July 28, 2020, 06:51:55 PM »
The height of individual waves at Barrow also exceeds 2 meters, which is more than the forecast.

Guestimating wave height offshore from the waves breaking to the shore is extremely difficult. Waves gain height when they approach shallower waters. Also the period cannot be properly seen from these images.

I'm not saying there aren't waves offshore, there has to be and a bad thing for the ice is that such fresh waves generated by the storm have short periods, just pointing out that the web cam imagery is not a very good proxy for the offshore waves.

Edit: windy shows almost 2m waves with 6s period hitting barrow and 2.6m with 7s period further north hitting the ice. That should give a proper stir.

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Arctic sea ice / Re: Freeform season chatter and light commentary
« on: July 31, 2019, 08:08:26 PM »
Is there any way to filter out messages based on poster and based on contained quotes?

This tworp is totally trolling and I while I certainly don't want to discriminate scientific illiteracy, I would like to skip that drivel myself.

4
Since the GAC has been a topic today, I'm going to pop up a question that's been bothering me for ages.

The GAC formed over Siberia and moved over to the Arctic and intensified. As someone only slightly acquainted with tropical cyclone formation I'm curious how does that happen exactly? How does an extratropical cyclone strengthen over the arctic sea? With all the heat in the arctic going into the melting ice and SSTs as a result being quite steady and low what does it feed on? Or do they just run that much colder that some open sea having gained even a little bit of dew point is enough?

Also are there some features to look for that might favour their generation and intensification like we have with tropical cyclones?

5
I'm not an expert, but wikipedia has a decent page about it that you can read before one of the weather gurus chime in here and provides more insight.

https://en.wikipedia.org/wiki/Arctic_dipole_anomaly

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