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Author Topic: Bathymetry, Volcanoes and Upwellings  (Read 352 times)

cesium62

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Bathymetry, Volcanoes and Upwellings
« on: August 14, 2017, 04:47:01 AM »
There appears to be a polyna in the Laptev at 120E 81N.  There is a large crater at the end of the Gakkel Ridge at those coordinates as well.  Is there a connection?

Does the Gakkel Ridge crater have a  name?  Do we have a good map that would show named features like that?

I can find reports of Volcanoes far to the northwest along the Gakkel Ridge; did the American research expeditions make it out to the end of the ridge?

In the Melting Season thread, Rathbone mentions that upwelling tends to occur over ridges.  Is the Gakkel Ridge Crater a known upwelling location?

[And is there a way to tag a forum thread to notify me when it gets updated?]
« Last Edit: August 14, 2017, 10:33:32 AM by Neven »

Neven

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Re: Bathymetry, Volcanos and Upwellings
« Reply #1 on: August 14, 2017, 10:31:21 AM »
At the top and bottom of the thread there's a 'notify' button.

And I've found a Laptev Bite thread from 2014, but not so much info in it.
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gerontocrat

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Re: Bathymetry, Volcanoes and Upwellings
« Reply #2 on: August 14, 2017, 12:33:43 PM »
A new thread appears just as ......

Scientists discover 91 volcanoes below Antarctic ice sheet

This is in addition to 47 already known about and eruption would melt more ice in region affected by climate change

https://www.theguardian.com/world/2017/aug/12/scientists-discover-91-volcanos-antarctica
"Para a Causa do Povo a Luta Continua!"

johnm33

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Re: Bathymetry, Volcanoes and Upwellings
« Reply #3 on: August 14, 2017, 01:28:40 PM »
I think what's happening is a version of this, https://www.youtube.com/watch?v=17IYhAt-2DE in the deep warm layer penetrating upwards, caused by movement of ice into and out of the basin, or the shift of high/low slp over the ridge or on/off shore.
Something similar happens at the far end of the basin but more diffuse given it's less focussed bathymetry, it shows in this gif.[for now]

These maps each have their own advantages but not quite everything you want, the first at least shows the lat/long of the cursor.
https://maps.ngdc.noaa.gov/viewers/fishmaps/
https://www.ngdc.noaa.gov/mgg/bathymetry/arctic/maps/version3_0/Ver3_Map_LetterSize_round.pdf

cesium62

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Re: Bathymetry, Volcanoes and Upwellings
« Reply #4 on: August 17, 2017, 01:04:49 AM »
I think what's happening is a version of this, https://www.youtube.com/watch?v=17IYhAt-2DE in the deep warm layer penetrating upwards, caused by movement of ice into and out of the basin, or the shift of high/low slp over the ridge or on/off shore.
Something similar happens at the far end of the basin but more diffuse given it's less focussed bathymetry, it shows in this gif.[for now]

These maps each have their own advantages but not quite everything you want, the first at least shows the lat/long of the cursor.
https://maps.ngdc.noaa.gov/viewers/fishmaps/
https://www.ngdc.noaa.gov/mgg/bathymetry/arctic/maps/version3_0/Ver3_Map_LetterSize_round.pdf

Thanks.  The 'fishmaps' has various named features on it.  The depression at 81.5N 120E doesn't seem to have a name.  The Shinkov Seamount, Sadko Valley, and Shaykin Hill are all nearby...

Searching for those features, I find
https://www.ngdc.noaa.gov/gazetteer/
which looks like a fairly definitive map of all officially named undersea features.

Anyway, I'ma call it Shugar Bowl until a better name catches on.  Laptev Polyna UnderBowl is just too long.

The hycom gif doesn't work for me.

The standing wave video is neat, and an interesting idea...

johnm33

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Re: Bathymetry, Volcanoes and Upwellings
« Reply #5 on: August 17, 2017, 10:26:08 AM »
It's worth keeping an eye on the other end of the basin when the polynya opens, it often thins but not often enough to prove the point. You may find the names on google earth. The effect in the vid is something that can be seen in many places when the tide is on the turn, at dusk you can almost see it as 'water' fish leaping from sat. dish sized bowls. Maybe around 21:00 tonight [forumtime]. https://www.minack.com/a-living-theatre/webcams/