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Anyone else notice the time period for the observations in the graphic accompanying the full article? Looks like they're only showing observations through 2010 - which makes the model forecasts look relatively more accurate.
Are scientists conservative about sea ice?
An interesting entry on the NSIDC Icelights blog (hat-top to GreenOctopus) that I also indirectly discussed a couple of months ago: Are scientists conservative about sea ice? Guest post by Walt Meier, NSIDC Scientist Arctic sea ice set a record minimum extent in September 2012, far below the...
Anyone else really curious about what happens with that big crack on the Petermann this summer?
Nares Strait 2012 Ice Arch Collapsing
It looks like the ice arch in at the southern end of Nares Strait has started to collapse, according to yesterday's satellite image from LANCE-MODIS: This break-up is occuring 10 days later than last year. Back then it took about two weeks for all of the ice to start moving across the entire s...
Looks like Michael's explanation corresponds to some work published in 2010: http://www.jpl.nasa.gov/news/news.cfm?release=2010-050
I'm sure the sill would interfere with this flow, but there does seem to be a mechanism that would draw warm, salty water into the fjord along the bottom while relatively fresh, cold water flows out along the surface.
The dark side of Greenland
Last January Dr. Jason E. Box. research scientist at Byrd Polar Research Center, reported on his Meltfactor blog that the Greenland ice sheet was getting less and less reflective. Albedo, the reflecting power of a surface that is defined as the ratio of reflected radiation, is high when the ice...
I could be wrong, but it looks like the pressure ridge off Barrow is breaking up. Looks like a big hole in it: about 1/3 of the way in from the left edge of the cam image, there seems to be a chunk missing out of the ridge. A gap is showing up on the radar image, too.
http://seaice.alaska.edu/gi/observatories/barrow_webcam
ASI 2012 update 5: when graphs agree
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Central to these updates are the daily IJIS sea ice extent (SIE) and Cryosphere Today sea ice area (SIA) numbers, which I compare to data from the 2005-2011 period (NSIDC ha...
We seem to be getting into a lot of discussion about how the methodologies for CT area (and others) may not accurately reflect reality, actual conditions, ground truth, et al. With remote sensing, that is always a discussion, whether things are looking crazy (like now) or stable.
The real question is whether or not the methodology has changed. If it hasn't, then the current high rate of change is the real discussion, not whether or not the actual numbers are 1% or 5% too high or too low. We presumably always see melt ponds at this time of year, right? The sensors presumably saw them (or didn't see them) as open ocean in past years, right?
...So, can we confirm that CT's methodology is the same? (We know to use a little caution with IJIS because of their sensor switch.)
ASI 2012 update 5: when graphs agree
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Central to these updates are the daily IJIS sea ice extent (SIE) and Cryosphere Today sea ice area (SIA) numbers, which I compare to data from the 2005-2011 period (NSIDC ha...
I looked up blue ice a couple of days ago after the original comment, and Kris summed it up: "pure" ice with no tiny air bubbles is blue, and ice with air bubbles is white.
My theory is that it's related to the high air temps: there's probably a constant sheet of water on top that's flowing down through every crack and crevice in the ice, displacing any air in all those little fissures. As the meltwater flows through those cracks into the sea underneath, it's replaced by new meltwater on top, so the cracks never "dry out". There's still a lot of air trapped in the ice, hence the light blue color.
The beautiful, sapphire-blue of glacial ice is because much more of its air has been pushed out by pressure.
Kind of blue
There has been a bit of a discussion of this in the ASI update 3 thread, but it looks interesting enough for a separate blog post. In the past three days the fast ice in the region between the New Siberian Islands and the Lena Delta has started to take on a blue colour (see below). I noticed a ...
Apologies for whining, but has anyone heard anything from the CT guys? It's been two weeks without them.
ASI 2012 update 1: a new beginning
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Because of the demise of AMSR-E the IJIS sea ice extent (SIE) numbers are no longer central to these updates. Instead I now use Cryosphere Today sea ice area (SIA) numbers and...
Crandles: I noticed the brightness differences, too. My guess was that it's a sensor issue or a difference in image processing. (Looks like the "camera exposure" was reduced - either in the "camera" or in the processing phase.) Greenland is much brighter and details are much harder to make out in 2011 images. Presumably, the actual albedo of the ice sheet there hasn't changed much from last year to this year.
Anyone with any real information on this, please chime in. If it's due to actual conditions, i.e. less snow, it will have a large impact on solar energy up there this spring/summer.
ASI 2012 update 1: a new beginning
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Because of the demise of AMSR-E the IJIS sea ice extent (SIE) numbers are no longer central to these updates. Instead I now use Cryosphere Today sea ice area (SIA) numbers and...
Very cool - thanks for the links. I'd only been looking at the NOAA pages:
http://www.arctic.noaa.gov/gallery_np.html
Nothing there so far.
April 2012 Open Thread
Just like with calling the CT SIA maximum, I can't even get the timing for the last open thread right. But the March open thread was getting full. This should be the last one. I think. image by Paul Nicklen, found on the Narwhal's Left Tooth blog I'll be gone for a couple of days, but should be...
Has anyone seen anything about the North Pole web cams for this year? They went up about this time last year; haven't seen any news about them, and there's nothing on their site.
April 2012 Open Thread
Just like with calling the CT SIA maximum, I can't even get the timing for the last open thread right. But the March open thread was getting full. This should be the last one. I think. image by Paul Nicklen, found on the Narwhal's Left Tooth blog I'll be gone for a couple of days, but should be...
I'm not taking the time to do any sort of analysis on this, but this late max appears to be part of a trend toward low late-winter/early-melt-season anomalies. Looking at the CT "tale of the tape", there appears to be a seasonal (and usually annual) maximum on the anomaly line around March or April since 2005.
My guess is that it's thinner ice being spread out more before melt and real fragmentation kick in. Any other ideas?
CT SIA: maximum reached (this time for real)
Update March 31st: It looks like the maximum has arrived even later. The peak from 11 days ago has been beaten by almost 8K square km. This isn't much, but those 11 days extra make it a super late maximum. And the Lord only knows if this is the final maximum. I'm not calling this one anymore, ev...
With all the chatter about cold continents, I was curious about Great Lakes ice, but Yvan beat me to it. Here's another nugget: NYPA and OPG removed the ice boom protecting the intakes at the Niagara power station very early this year due to lack of ice.
http://online.wsj.com/article/AP38eda65455324617979dfcd75821644f.html
March 2012 Open Thread
This will be the last open thread of the freezing season. Use it wisely. image found here
Someone correct me if I'm wrong, but I think we're within two weeks of maximum Arctic ice area, and we're 122M sq km shy of the previous CT record for lowest max.
February 2012 Open Thread
There's a poll in the right hand bar running until February 8th for predicting the Cryosphere Today maximum sea ice area number. Don't be afraid to share your prediction in the comments of this thread: 2012 Maximum Area Pool --- We are entering the final phase of the freezing season. After that...
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