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Messages - Tor Bejnar

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Arctic sea ice / Re: The 2019 melting season
« on: April 21, 2019, 10:44:04 PM »
Uniquorn's 50-day movie reminds me of the report (maybe in a publication referenced in Icy Seas years ago?) that in 2007 (a year where Nares Strait never closed) Nares Strait ice export was 10% of that of Fram Strait. 

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 19, 2019, 04:35:27 PM »
The 'nose' was just past Hans Island yesterday (per DMI's images) (70 km in '1 day'!), a little rounder than it was the day before, as it was slightly too big to fit past Hans Is.  The 'tail' has further broken into smaller floes.

The rest / Re: Climate change activists should not fly
« on: April 19, 2019, 02:15:34 AM »
Hmmm.  Cheap bus (one way) NYC-LA: $168
Cheap train (one way) NYC-LA: $192
(2 days 20 hours, plus or minus)
(from here)

If such a battery [1,000 Wh/kg] was real our emissions problems would be solved.
Maybe... If they are 4x more dense (I think that's the term) but 100x more expensive, their use will be limited (or if they are rechargeable, but only 20 times; or the charge only holds for a few hours …).  Of course, that '100x' will be whittled down to 1 - 4x in time, probably, and then "our emissions problems would be solved".

We are living in interesting times!

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 18, 2019, 06:48:08 PM »
The 'nose' of the largest floe to enter Nares Strait recently is going faster than its tail.  The nose section moved nearly 50 km in one day, while the tail moved 10 km less [i.e., it broke].  (The little island next to the nose, by the way, is Joe Is. [map]  Hans Is. is nearly 70 km downstream, and the channel's width between Hans Is. and the side of Judge Daly Promontory (Elsmere Is.) appears to be less than the width of the nose at its widest.  The tail, of course, is wider still.)

Edit: Floes in Kane Basin and Smith Sound moved 45-50 km between April 16 and 17 DMI images (not pictured).

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 17, 2019, 05:38:20 PM »
The Nares Strait is, I believe, bordered by extremely hard limestones and dolomites.
This is "true" as far as it goes. 
Here is a partial 'grab' of rock types associated with each group of formations identified on first map from Denmark (yes, lots of dolomite, some of it 'hard') [some great photographs showing examples of outcrops]:
  • ‘Ellesmere Island – Inglefield Land belt’:  used to describe occurrences of the same gneiss, supracrustal and igneous suites on both sides of Smith Sound (Dawes 1988).
  • The Thule Basin is defined by a thick sedimentary-volcanic succession.  K-Ar ages of 676 and 627 Ma
  • Palaeozoic Franklinian Basin
    • Dallas Bugt Formation: Red to purple-brown arkosic sandstones with con-glomerates form the basal strata, overlain by white to pale yellow weathering, crossbedded sandstones, and topped by finer grained sandstones interbedded with green bioturbated mudstones
    • Humboldt Formation: basal fluvial sandstones and conglomerates, are succeeded by cross-bedded, bioturbated, shallow marine clastics of tidal origin, with the upper interbedded sandstone and mudstone
    • Ryder Gletscher Group: carbonate and siliciclastic deposits:  cliff-forming dolomites, crossstratified dolomites, hard grey dolomite, grey dolomites, with some thin silty horizons, mottled lime mudstones with silty laminations and horizons, together with dolomite-filled burrows and small mounds, locally dolomitised burrowed lime mudstones and minor conglomerates with some interbeds of grey, often glauconitic, calcareous finegrained sandstones; in the south-west glauconitic sandstones and siltstones dominate, with some more resistant limestone beds, uniform and hard, locally dolomitised oolitic limestone, bedded platy lime mudstone with silty laminae, and laterally extensive beds of intraformational flat-pebble conglomerate, massive thin bedded dolomites, stromatolitic mounds, siltstones and bituminous limestones, grainstones and white, brown-weathering sandstones, cliff-forming, burrow-mottled, grey lime mudstones with subordinate intermixed stromatolitic to thrombolitic limestones, sponge mounds and flat-pebble conglomerates, shaly dolomites, laminated lime mudstones and shales with both algal and wave-formed lamination, and dolomitic sandstones. Conspicuous beds of laminated to massive anhydrite and gypsum.
    • Morris Bugt Group: cliff-forming dolomitic limestones, with one distinctive recessive argillaceous unit
    • Washington Land Group: reef-derived deposits, lime mudstones, dolomitic limestones, dolomites and resedimented limestone conglomerates, together with subsidiary siltstones and shales.
    • Peary Land Group: siltstone and sandstone turbidites

The second map is from a Geologic Map of the Arctic from Canada with a few place names added in red.  A plate-boundary transverse fault (with complications) runs through the Strait.

Walking the walk / Re: When was the last flight you took?
« on: April 17, 2019, 03:05:02 PM »
About 5 years ago I flew to New Mexico as my mom had just moved out of the 'ancestral' home and I drove home in a U-Hall (with a sister who also lives in the East) carting old (fine) family furniture.  Before that, I flew (with family) to Colorado in 2005 to help spread my father's ashes in the area he camped almost every summer from 1947 to 2003 (obviously, I camped there a lot too).  (I did the 'carbon offset credit' thing to ease my guilt both times.)   The 'sparsity' of my recent flying 'makes up' for my having flown around the world 4 times in the '70s and '80s, taken 5 other trans-oceanic round trips (60's - 80's), and about 2 dozen domestic commercial flights (70's - 90's).  I grew up flying as my parents had a single propeller airplane they used (sometimes extensively) for work.  I 'stopped' flying because of what I learned about climate change.  Since 2000, we drive to New Mexico to see my mother [and father once] and brothers (and sometimes a visiting sister who lives further west) about once a year, with the benefit of seeing a cousin in Texas, and we can bring home rock specimens (read: "boulders to line our driveway").

Policy and solutions / Re: Renewable Energy
« on: April 17, 2019, 01:47:18 AM »

According to EnAppSys’ figures, a total of 27.2 terawatt-hours (TWh) of renewable electricity was generated over the first quarter of 2019 in Great Britain (as opposed to the United Kingdom, which includes the Republic of Ireland),
One might wonder if they have their geography wrong, do they have their numbers wrong... :-\
The Difference Between The UK, England, And Great Britain
So in summary:
    Great Britain = England, Scotland, and Wales
    UK = England, Scotland, Wales, and Northern Ireland (and the full name is the “United Kingdom of Great Britain and Northern Ireland”)
    England = Just the part of the island that is England
[Edit:  I sent this info to Clean Technica.]

Consequences / Re: Places becoming less livable
« on: April 16, 2019, 09:14:30 PM »
The southern half (so far) of Florida, apparently, is becoming less livable for native pygmy rattlesnakes.  Bloodsucking worms found in Florida rattlesnake species alarm researchers: It's a 'nasty situation'

Farrell and his students have tested a total of three pygmy rattlesnakes and found the same type of bloodsucking parasitic worms in each of the reptile's lungs and near their tracheas. The researchers then collaborated with the University of Florida's College of Veterinary Medicine to conduct tests on the creatures' DNA to determine how the parasites were being introduced.

They discovered the parasite species appeared to be from southeast Asia, indicating they may be connected to Burmese pythons, a species native to that particular region that also happens to be an invasive species in the Sunshine State. They published their findings in the Herpetological Review in March.

Consequences / Re: Places becoming less livable
« on: April 16, 2019, 06:16:11 PM »
Curious that Wikipedia posts conflicting ages of the several lobes (different recent publications, per references).  But the concept is very real.  This image from the Wikipedia article shows that un-fed lobes disintegrate when not fed - during the course of 6,000 years with insignificant sea level change (compared to what's coming).

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 16, 2019, 05:22:36 PM »
Looking at pairs of DMI-Greenland Sentinel images that are "1 day" apart (but who knows the exact number hours between any two images?) - March 14 and March 15 - I see large floes coming into the north end of Nares Strait (that I'm 'sure' will break along the way, and not create an ice jam) having moved 30 km, floes moved 65 km in Hall Basin, 35 km in Kane Basin, and 55 km in Smith Sound.  (Named locations can be found in the very first link offered in the [Greenland and Arctic Circle folder] Google Maps with place names thread Reply #1 or more directly here.)  Averaging these rates, ice is currently taking about 10 days to traverse the 500 km length of Nares Strait.

Antarctica / Re: Antarctic Icebergs
« on: April 16, 2019, 04:40:06 PM »
During this week (as of March 15), A68-A has moved 6 km northwards (measuring at the side of the ice island closest to the point just north of Larsen C Ice Shelf, and the south end has moved (rotated) about 7 km eastward (away from Larsen C).  (Image is stitched from two Polar View images [north and south].)  I'm guessing the ice island will continue its slow counterclockwise spin and will thus not get stuck south of Robertson Island, although I expect the ice to bump into the island (in 3 weeks, at the current rate).

Arctic sea ice / Re: Glossary ... for newbies and others
« on: April 16, 2019, 04:27:40 AM »
Just to substantiate what Sebastian wrote, see Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation - Geophysical Research Letters 44(1) · December 2016 

Arctic sea ice / Re: Latest PIOMAS update (April 2019)
« on: April 15, 2019, 03:27:00 PM »
Image from arctischepinguin via ASI Graphs
I find it interesting that Wipneus's exponential regression has suggested a record low ASI volume below 4K km3 would occur each year since 2011.  Of these, only 2012 had a record low volume below 4K km3.  Is this the  'slow transition' at work or 'statistical noise'?  (I think only time will tell.)

 (Each of the square dot curve segments start with the projected minimum for the year following each year's minimum.  For example, following the 2018 minimum, the curve projects 2019 [dark blue square dot] to have a ASI volume about 2.7K km3 and no ice in 2024.  [The post-2018 curve is in red, not matching the blue dot, but the others all match the curve created at that time.])

Consequences / Re: Pathogens and their impacts
« on: April 15, 2019, 03:40:28 AM »
... My suspicion is that Ebola is evolving into an STD ...
It is an STD and 'always' has been.

Greenland and Arctic Circle / Re: Bedrock overlay poll
« on: April 14, 2019, 04:47:00 AM »
I didn't know what the words meant - "horizontal overlay" vs.
full image opacity".  However, opening the two files, and figuring out that the maroon dot [Test 1- horiz. overlay] is a slide anchor (I think I first saw the tool when looking at before and after photographs of fire-ravaged areas last year, where you can slide one image over the other - back and forth), gave me the information needed to make a choice.

Policy and solutions / Re: What type of transportation do you use?
« on: April 14, 2019, 03:44:33 AM »
2002 Prius with 140,000 miles (226,000 km), bought used in 2003 (with 20k miles), so I've averaged 7,500 miles/year (12,100 km/yr).  We live on a narrow (no shoulder) country road, and bicycling to work (in the dark) would not be smart.  The car's gas mileage dropped from about 45 mpg (19 kmpl) to about 35 mpg (15 kmpl) - I don't know why unless it's the ethanol in the gas or less efficient tires.

Science / Re: 2019 Mauna Loa CO2 levels
« on: April 12, 2019, 09:08:22 PM »
Thank you B_,
Lurk does write, "iirc" which frequently means 'If I Recall Correctly.'  Why one would base a post on recollection when the evidence is in the very thread (at the top) is beyond me!

Science / Re: 2019 Mauna Loa CO2 levels
« on: April 12, 2019, 08:22:12 PM »
btw iirc, that single ≥ 3.5 ppm vote was by me. I might end up wrong on that obviously but we'll see huh?  :)
Sorry bud, that one >3.5 ppm vote was by my pessimistic ass!
Apologies, thanks for clarification. It was what I was thinking maybe I missed the bus to vote on time.  Seems more credible an option now than it looked in January. :)
Has Lurk just admitted to lying?  I suppose a screen-shot image of the poll can be Photoshopped, but how one voted is pretty obvious, given that row is highlighted.
Edit:  see post below.

The rest / Re: Brexit...
« on: April 12, 2019, 07:42:18 PM »
I wrote somewhere that the same Russians that "voted" for Trump "voted" for Brexit. 
Who says you shouldn't 'vote by proxy'?  I pay only a little attention to what is befalling Great Britain, and I do not have foresight.

Title: "EIA's Annual Energy Outlook 2019 projects growing oil, natural gas, renewables production"
That graph, ASLR, is depressing.  Renewables need to climb 2 orders of magnitude beyond the EIA's expectations to serious displace oil & gas.  The only good news is that the EIA is likely underestimating renewables - I hope by 2 orders of magnitude!

The forum / Re: Suggestions
« on: April 11, 2019, 08:26:34 PM »
After following B_'s advice and having read all you want, click on the "MARK ALL MESSAGES AS READ" button, so that the 'rubbish' (should there be threads you're not interested in) doesn't sit there.

Developers Corner / Re: poll test
« on: April 11, 2019, 04:42:00 PM »
Don't die, Oren!  Don't do it!  Kassy has it in for you, obviously...
 :P ;D

The rest / Re: Elections 2020 USA
« on: April 11, 2019, 04:39:58 PM »
The "Abolition of Abortion in Texas Act" would classify abortion as murder "regardless of any contrary federal law, executive order, or court decision,"
[emphasis added]
Pretty brazen, isn't it, for a law (an intended law at this point) to declare courts do not have the power to determine constitutionality?   At least this part of the Act would surely be determined unconstitutional.  Those three words makes me think the whole purpose of the drafted Act is to score political points and not get enacted.

Also, as many fertilized eggs die young naturally, would this be manslaughter? ("You know, Your Honor, she sneezed, and should be held responsible for her actions.")
… researchers have estimated that 40 to 65 percent of conceptions end in miscarriages. And more than half of those occur so early that pregnancy is not even suspected yet (miscarriages that happen in the first few weeks of pregnancy are called chemical pregnancies or blighted ovums — meaning that the fertilized egg failed to implant or develop for unknown reasons).

Comparing when I was a kid and now, there was much more snow then, and more rain now.  But that's comparing New Mexico mountains with Florida.  :D :o ::) 8) :-X

In my state they just passed a $200 annual fee on any plug-in and a $100 fee on non-plug-in hybrids.
To be fair, a government that pays for road repair from gasoline tax revenues requires other/additional funding when users of the road stop buying gasoline, but that fee is steep!  $200 covers the 10¢/gal tax for a 30 mpg vehicle going 60,000 miles.  My 2002 Prius would get charged $100, the tax equivalent of 35,000 miles/year [mileage has decreased from 45 to 35 mpg over its life, and I drive it less than 10,000/year.]

It may not be short-term environmentally smart to tax EVs this way (at this time - in 10 years it might be), but until there is significant public opinion supporting EVs and some other way chosen to obtain highway funding, this was the 'best' they could come up with (besides the bonus [from their perspective] of a black eye to Al Gore …)

Policy and solutions / Re: Direct Air Capture (of Carbon Dioxide)
« on: April 10, 2019, 08:02:57 PM »
The breakthrough that could actually reverse climate change
By Grist Creative on Apr 8, 2019

turning captured CO2 in concrete aggregate (the pebbles and sand, not the cement)


By some accounts, concrete alone is responsible for 4-8 percent of the world’s CO2 emissions. And it’s only getting worse. Between 2011 and 2013, China used more cement than the United States used in all of the 20th century — about enough to pave paradise and put up a parking lot the size of Hawaii’s Big Island. Cement production worldwide could grow another 23 percent by 2050.

To do that, the Foundation for Climate Restoration estimates that a trillion tons of CO2 must be removed from our atmosphere on top of additional efforts to curb emissions. The National Academies of Science agrees that “negative emissions technologies,” as they’re known, are essential.

Blue Planet’s process starts with collecting CO2 and dissolving it in a solution. In the process, the company creates carbonate that reacts with calcium from waste materials or rock to create calcium carbonate. Calcium carbonate happens to be the main ingredient in limestone. But rather than superheating it to create cement (which would release all that CO2 right back into the atmosphere), Constantz and his team turn the resulting stone into pebbles that serve as aggregate.

This is easiest to do where there’s lots of CO2 — smokestacks at factories, refineries and power plants, for example — but it can also come from “direct air capture,” using less concentrated air anywhere, a technology whose costs are rapidly declining.

Blue Planet’s limestone, created using emissions collected from the Moss Landing Power Plant on Monterey Bay and other sources, has already been added to concrete in areas of San Francisco International Airport. Constantz expects to open its first commercial production facility in the Bay Area within the year, producing a little over 300,000 tons of rock annually with C02 captured from an adjacent power plant’s exhaust stack.
[emphasis added]

Science / Re: Earthquakes and climate change
« on: April 10, 2019, 04:02:44 PM »
I don't know about the "and climate change" angle, but here is an Earthquakes of 2018 summary, posted on January 1, 2019 by Chris Rowan in Highly Allochthonous

Based on the last 50 years or so of data from the global network of seismometers, in an average year we expect around 1500 magnitude 5-6 earthquakes; about 130 magnitude 6-7 earthquakes, about a dozen magnitude 7-8 earthquakes, and maybe one event larger than magnitude 8 (earthquakes of magnitude 9 or more are much rarer beasts, with only two so far in the 21st century). 2018 boasted about 10% more M5-6 earthquakes than the long-term average, about 10% less M6-7 earthquakes, and about 20% (2-3) more M7-8 events and that one M8+ event. All this is well within the variability we see between years in the records since 1974.

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 09, 2019, 09:07:10 PM »
Thanks Uniquorn for the link.  I added an edit to my previous post.  South 'old winds' winds maxed out around 1200 hours on March 4 (at least as far as I looked) in the Lincoln Sea, and were generally from the south for a couple of days.  The ice moved north between the March 3 and March 4 Sentinel images.

And thanks for the big laugh, B_.  :)

Arctic sea ice / Re: Ice edge at minimum poll
« on: April 09, 2019, 07:53:15 PM »
My suggested map for the 2019 minimum looks something like 2016's minimum.  Perhaps its defining nature is multiple regions of ice separated by ice-free water, and an ice-free North-pole.
Colour Color = yellow.

Edit:  I've added back my 'original' representation of the "yellow line" which was done on the 2016 frame of Uniquorn's April 8 post.  This is not a 'substitute' for the official entry, it is just to show its genesis.

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 09, 2019, 07:16:16 PM »
Is this a tidal wave reversing the flow briefly?
There are times when Lincoln Sea floes move northwards when there are strong southerly winds.  I think this happened once during the Pooh Sticks race.  (I know functionally nothing about tidal forces, and they may have been present, even dominant, during the race.  Alas, I apparently did not report my watching wind forecasts [which I did do], and my memory of when there were south winds may be faulty.)

Edit:  looking up nullschool winds for March 3 & 4 (when D Day Ice moved northwards), there were some south winds, but mostly not very strong.

Arctic sea ice / Re: "Stupid" Questions :o
« on: April 09, 2019, 06:37:02 PM »
... I was wondering whether the water in the clouds came from the melting in the Arctic region, travelled South, then dropped it on the US?
Further to what Niall wrote, from my regular reading of the Weather Underground Cat6 blog, I've learned that most extreme rain and snow events in the eastern quarter or third of the USA contain moisture largely derived from the Gulf of Mexico.  Typically, a jet stream loop drops down over western states, picks up moisture and dumps it (as far west as) from Texas to Nebraska and places east and north (or the whole thing is shifted eastwards).  The air, having gone over the Rockies [rising air cools, losing its ability to hold moisture], is generally depleted of the moisture it obtained from the Pacific.  As cold air can hold less moisture than warm air, Arctic-sourced air 'never' contains as much H2O as Gulf-sourced air.  (Note this is my understanding for most "extreme events"; I'm sure there is plenty of Pacific and Arctic sourced precipitation events in the north or northeast USA and eastern Canada.)

[Note: I am not a meteorologist by any stretch of any mind.]

Developers Corner / Re: poll test
« on: April 08, 2019, 10:02:14 PM »
As I cannot remove/change my vote, you've got a captive 'audience'.

Developers Corner / Re: poll test
« on: April 08, 2019, 09:50:57 PM »
Did you want participants?  (You got one, whether you wanted one or not.)

Policy and solutions / Re: Tesla glory/failure
« on: April 08, 2019, 09:29:25 PM »
Boy, you pay enough for one; you'd think they would follow voice commands when delivered.  Or maybe this is part of the post-factory, pre-delivery training program, which makes it okay.  So, Archimid, is this a sign of glory or failure? [/s]

Antarctica / Re: Antarctic Icebergs
« on: April 08, 2019, 09:10:32 PM »
A68-A have move north about 12 km in 6 days, per today's PolarView (and the image above).

[Note: as 1º latitude = 110 km, the 'waist' of A68-A is about 27 km wide.]

Arctic sea ice / Re: What's new in the Arctic ?
« on: April 08, 2019, 07:07:35 PM »
Key indicators of Arctic climate change: 1971–2017
Jason E Box, et al. in Environmental Research Letters (2019) review includes
"The Arctic system is trending away from its 20th century state and into an unprecedented state, with implications not only within but beyond the Arctic," according to lead author Jason Box of the Geological Survey of Denmark and Greenland in Copenhagen.

Who'd 'a thought!

Policy and solutions / Re: Oil and Gas Issues
« on: April 08, 2019, 04:37:31 PM »
Per Bloomberg, Stocks down, Oil up (today): the relationship is not a surprise.

NSIDC's Arctic Sea Ice News and Analysis of April 3 includes a discussion on Arctic Ocean snow cover and this graph. (Something like: less net snow cover due to late freeze, early thaw and changing weather patterns (but more snow in the CAB), with consequences for ice growth, etc.)

Arctic sea ice / Re: What's new in the Arctic ?
« on: April 08, 2019, 01:06:32 AM »
A screen print from that presentation:

Arctic sea ice / Re: Are 3 dimensions better than 2?
« on: April 07, 2019, 07:12:35 AM »
1) I've been surprised how much fervor has gone into this thread.
2) I'm grateful to KK for "sticking to his guns"
3) "Are 3 dimensions better than 2?":  Better for what?

I voted for "3" because I was considering things like comparing 1980 Arctic ice health with today - the ice volume difference 'really matters'.  Like, really matters a great deal.

This doesn't mean that "2 dimensions" isn't highly significant for many aspects of Arctic climate dynamics, fairly independent of whether the ice is 2 meters thick or 10 meters thick.  Knowing only a "2 dimensions" number is certainly "better" for calculating albedo than knowing only a "3 dimensions" number.  (Does that 1,000,000 km3 cover 500,000 km2 or just 5,000 km2?)

Yes, ice that is thinner than a meter or two (and more so when thinner) is relatively transparent, allowing for solar-induced bottom melt and algae growth, and may be more likely to be rotten late in the melting season allowing a polar bear to either catch a seal or fall through and have to swim.  And then there is how waves, etc. affect thinner ice.  But all this just begs the question.  I don't think the thread's question is "Is knowing thickness better than knowing area?"

Arctic sea ice / Re: The 2019 melting season
« on: April 05, 2019, 09:59:17 PM »
Weather trumps all.
Especially blow-it-out-into-the-Atlantic weather!

Non-plug-in BEVs could include solar cars - there have been races of these vehicles since the Tour de Sol in 1985. Just the other day I read about wireless charging:  Norway will install the world’s first wireless electric car charging stations for Oslo taxis.

Antarctica / Re: Antarctic Icebergs
« on: April 03, 2019, 07:15:28 PM »
A68-A has moved since the previous post.  As of April 2, it has moved northward (NNW) (parallel to the local coast) about 30 km. It's got to go due east, then northeastwards to stay away from land.  I think the 'bluish tinged' coast due north (upper left corner) is Robertson Island.  PolarView image from 2019-04-02 [map credit]

The consequence of that warming is seen in Banks Island thaw slumps:  Extremes of summer climate trigger thousands of thermokarst landslides in a High Arctic environment
  Antoni G. Lewkowicz & Robert G. Way  -  Nature Communications volume 10, Article number: 1329 (2019)

Retrogressive thaw slumps (RTS) – landslides caused by the melt of ground ice in permafrost – have become more common in the Arctic, but the timing of this recent increase and its links to climate have not been fully established. Here we annually resolve RTS formation and longevity for Banks Island, Canada (70,000 km2) using the Google Earth Engine Timelapse dataset. We describe a 60-fold increase in numbers between 1984 and 2015 as more than 4000 RTS were initiated, primarily following four particularly warm summers. Colour change due to increased turbidity occurred in 288 lakes affected by RTS outflows and sediment accumulated in many valley floors. Modelled RTS initiation rates increased by an order of magnitude between 1906–1985 and 2006–2015, and are projected under RCP4.5 to rise to >10,000 decade−1 after 2075. These results provide additional evidence that ice-rich continuous permafrost terrain can be highly vulnerable to changing summer climate.

paper and pictures at link

Science / Re: Underground temperatures trends
« on: April 02, 2019, 08:52:07 PM »
A slippery slope: How climate change is reshaping the Arctic landscape article about study by Antoni Lewkowicz, University of Ottawa, published in Nature Communications
Increasing ground temperatures in the Arctic are indicators of global climate change, but until recently, areas of cold permafrost were thought to be relatively immune to severe impacts. A new study ... shows that areas of cold permafrost can be vulnerable to rising summer temperatures.

… recorded an astounding sixty-fold increase in the number retrogressive thaw slumps—landslides caused by the melting of the ice in the permafrost—on Banks Island over the past three decades.

The rest / Re: Archaeology/Paleontology news
« on: April 02, 2019, 06:28:28 PM »
For another take on the recent K-T (now K-Pg) Boundary news:  A bad day at the end of the Cretaceous by Steve Drury, concerning both DePalma, R.A. and 11 others 2019, A seismically induced onshore surge deposit at the KPg boundary, North Dakota, Proceedings of the National Academy of Science; and Preston, D. 2019, The day the dinosaurs died, The New Yorker.

Some snippets:

 its contents are the stuff of dreams for any aspiring graduate student of palaeontology; the Indiana Jones opportunity.

The paper itself contains little of the information that dominated Preston’s New Yorker article and the global media coverage.
If verified in later peer-reviewed publications, DePalma et al’s work would help resolve the gradual vs sudden hypotheses for the end-Cretaceous mass extinction.

Greenland and Arctic Circle / Re: What's new in Greenland?
« on: April 02, 2019, 04:52:49 PM »
New Icy Seas post by Andreas Muenchow:
How to whisper under sea ice: Wireless Acoustic Sensor Network Design
(most of article's first and last paragraphs below - lots of interesting paragraphs in between)
I want to build a cell phone system under water. I want it to send me a text messages every 30 minutes from 200 feet below the ocean that is covered by sea ice next to a glacier in northern Greenland where polar bears roam to catch seals for food at -40 Fahrenheit.

Subsequent analysis in 2017/18 revealed a successful experiment as data from ocean sensors traveled along multiple paths to the weather station and on to the internet. All data were submitted to the NSF Arctic Data Center where after review they will become public at

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 02, 2019, 03:47:06 PM »
Evidence suggests one factor driving ice movement is sea surface height.  Certainly there are others, including tidal forces, subsurface currents and prevailing winds. 

I agree my "shows why it mostly comes" was too strongly expressed, so I'm editing my previous post.

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 02, 2019, 03:32:59 PM »
Uniquorn's post just above shows that the ice in Nares Strait currently comes from north and northwest of the Lincoln Sea.  His sea surface height GIF in the Arctic Ocean salinity, temperature and waves thread (screen print below) shows [edit] one possible cause of why it comes why it mostly comes from here, and not from the northeast.

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