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Edited Landsat 8 image of the breakup of the large iceberg that just split away from the Larsen C ice shelf.
Image source: earthobservatory.nasa.gov/IOTD/view.php?id=90627
Original caption: When a massive iceberg first broke away from Antarctica’s Larsen C ice shelf sometime between July 10-12, 2017, scientists knew it would eventually start breaking apart. That’s the normal life cycle of a drifting iceberg, which is at the mercy of the ocean’s battering currents, tides, and winds. Already those forces have turned A-68 into two named bergs, A-68A and A-68B, as well as a handful of pieces too small to be named by the U.S. National Ice Center.
In the two weeks following the initial break, satellite imagery has documented the iceberg’s motion. The southern end appears to have slammed into a mix of floating ice above Gipps Ice Rise—the bump of snow- and ice-covered bedrock visible in the lower right of the image. Then the berg rebounded and its northern end swung back toward the just opened rift. The resulting impact caused both the berg’s north end and the ice shelf to fracture.
“The back-and-forth movement of A-68 looks akin to maneuvering a parallel-parked car out of a tight parking space—like an Austin Powers three-point turn,” said Christopher Shuman, a cryospheric scientist at NASA’s Goddard Space Flight Center and the University of Maryland, Baltimore County.
The fractured berg and shelf are visible in these images, acquired on July 21, 2017, by the Thermal Infrared Sensor (TIRS) on the Landsat 8 satellite. The false-color view shows the relative warmth or coolness across the region. White indicates where the ice or water surface is warmest, most notably in the widening strip of mélange between the main iceberg and the remaining ice shelf. Dark grays and blacks are the coldest areas of ice.
So far, the calving and fracturing has taken place under the dark cover of polar night during Antarctica’s austral winter. That makes thermal imagery from satellites a critical tool for “seeing” the action. Adrian Luckman of the UK-based Project MIDAS first saw the berg break away in thermal data from the Moderate Resolution Imaging Spectroradiometer (MODIS), before Sentinel radar data became available later on July 12.
The thermal view above shows a remarkable amount of detail. The bright signature of relatively warm ocean water appears around A-68B, which broke off sometime between late July 13 and early July 14. More subtle fractures north of A-68B are visible on the shelf; these pieces will eventually break free and move out to sea with the rest of the ice.
All of the ice pieces large and small are subject to the water currents of the Weddell Gyre and the strong weather systems that can whip up blinding snow and blanket the region in clouds for many days at a time. This same ocean circulation that will eventually move the bergs northward toward South Georgia Island.
In the meantime, scientists will have to wait until August—the end of polar night here—to get their first natural-color images since the long-growing Larsen C rift became a complete break.
References and Related Reading
NASA Earth Observatory, Rift and Calving at Larsen C Ice Shelf.
NASA Earth Observatory (2017, July 12) Antarctic Ice Shelf Sheds Massive Iceberg.
NASA Earth Observatory (2017, July 12) Landsat Spots Birth of Iceberg A-68.
Project MIDAS (2017, July 12) Larsen C calves trillion ton iceberg. Accessed July 12, 2017.
NASA Earth Observatory images by Jesse Allen, using Landsat data from the U.S. Geological Survey. Story by Kathryn Hansen.
Instrument(s):
Landsat 8 - TIRS
www.hilyts.com/wp-content/uploads/2015/04/Miley-Cyrus-And...
Miley Cyrus and Patrick Schwarzenegger split
Miley Cyrus and Patrick Schwarzenegger split- Patrick Schwarzenegger was a while ago already spotted with an unknown lady, where Miley was absolutely not happy was it. After that Patrick had another hangout with an actress, Bella Thorne.
The rumors were equally round, but it was not obvious ...
www.hilyts.com/2015/04/23/miley-cyrus-and-patrick-schwarz...
so, i've gently alluded to my previous relationship but this is the first time i've ever had real cause to mention it. i recently (a month and a half ago) ended my relationship with my now ex-boyfriend of five and a half years. while five and a half years isn't very long in the grand scheme of things, it was more than a quarter of my life (me being only twenty and all) and had therefore had a profound impact on who i am...there is very little that i have that does not remind me, strongly, of that relationship. i broke his heart though, and i had to deal with it. fortunately, i was far away, on the other side of an ocean with little to remind me of him. when i arrived home, i was greated by this box, filled with everything i'd ever given him...everything he'd bought while we had been, physically, together...all of the random stuff that reminded him of me. this was the epitome of giving back the ring... i avoided the box yesterday, because i couldn't bring myself to look inside...it was so intimidating, but i had to do it today...and this is what i found...i debated between this shot and one that shows up in the rejects group of me touching the artwork he returned to me. it's sad for me, especially since i have few memories of my hometown without him, but i know it was the right decision...i had grown up and he hadn't...
constructive criticism welcome
Ugh =_=
This thing took way too long, and way too much of my sanity to suck this much. XD
I had this really great idea (in my head) but it didn't come out as well (on the paper.)
Joy.
But anyway, here it is, SAHS round three.
All size please, though it doesn't make it suck that much less :/
As Fish Creek begins its annual thaw, it begins eyeing up potential creekside victims. In June, if conditions are just right, this can become quite the destructive torrent.
Pentax MX
SMC Pentax-M 50mm f/1.4, yellow filter
Kentmere 100
Kodak Xtol 1+1, 10:00 @ 20°C
Roll 70, Frame 8
How IRONIC, I break up with my boyfriend on the anniversary of "my first love's" anniversary.
All is well,no worries.
Another timelapse looking over Lake Ontario from my back yard as the storm rolls out. I love the "popcorn clouds!" (the ones that start out as a little puff of vapour then grow into giant fluff balls... they're near the end of the video) The music is a remix I did of "A Drowning" by How to Destroy Angels. (I stretched out the end so the music ended less abruptly as it is only part of the song)
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Trying to find the beauty in the breakup. (Breakup is the ugly thing that happens after you've had snow in Alaska all winter & then it begins to thaw.) Took a walk around the yard with the 12-year old to find some life & color.
Taken in spring 2009 right after the breakup. I'm sure I have some other photos from this time somewhere in my files. It was a bit more of a physical breakup this year, with all the pieces coming up onto MacDonald Island from the Athabasca River. It was amazing to walk around it and see all the large chunks of ice on the shore.
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