Skip to main content

The bad news continues for our planets air conditioner. Iceberg B-31, estimated to be 35 by 20 km or the size of Virginia Beach or Singapore, has cracked and is moving away from the coast.

“In mid-October 2011, NASA scientists working in Antarctica discovered a massive crack across the Pine Island Glacier, a major ice stream that drains the West Antarctic Ice Sheet. Extending for 19 miles (30 kilometers), the crack was 260 feet (80 meters) wide and 195 feet (60 meters) deep.”

Scientists first detected a rift in the glacier in October 2011. By July 2013, infrared and radar images showed that the crack had cut completely across the ice shelf to the southwestern edge. New images now show that Iceberg B-31 is finally moving away from the coast, with open water between the iceberg and the edge of Pine Island Glacier.

Pine Island Glacier 2013: Nov. 10
This MODIS image taken by NASA’s Aqua satellite on Nov. 10, 2013, shows an iceberg that was part of the Pine Island Glacier and is now separating from the Antarctica continent.  What appears to be a connection point on the top left portion of the iceberg is actually ice debris floating in the water.

The original rift that formed the iceberg was first observed in October 2011 but as the disconnection was not complete, the “birth” of the iceberg had not yet happened. It is believed the physical separation took place on or about July 10, 2013, however the iceberg persisted in the region, adjacent to the front of the glacier.

Image credit: NASA

According to The Watchers:

Scientists have been studying Pine Island Glacier closely because there is evidence that warmer seawater below the shelf will cause the ice grounding line to retreat and the glacier to thin and speed up. The shelf of Pine Island Glacier has been moving forward at roughly 4 kilometers per year. Pine Island Glacier is the longest and fastest flowing glacier in the Antarctic, with vast icebergs being calved from ice shelf every 6-10 years. Previous notable events occurred in 2007 and 2001.
NASA reports:
“It is hard to predict with certainty where and when these things will drift,” said NASA glaciologist Kelly Brunt. “Icebergs move pretty slowly, and watching this iceberg will be a waiting game.”

The shelf of Pine Island Glacier has been moving forward at roughly 4 kilometers per year, so the calving of this iceberg is not necessarily a surprise, noted Tom Wagner, NASA’s cryosphere program manager. Such events happen about every five or six years, though Iceberg B-31 is about 50 percent larger than previous ones in this area. Scientists have been studying Pine Island Glacier closely because there is evidence that warmer seawater below the shelf will cause the ice grounding line to retreat and the glacier to thin and speed up.

If Pine Island Bay clears of ice by the annual sea ice minimum in February–March, then Iceberg B-31 could move out into the Southern Ocean. (Click here for a wider view of Antarctica and the sea ice blocking the path.) Once it leaves the bay, the iceberg is likely to get caught up in the flow of the “coastal counter current”—which flows counterclockwise around Antarctica—or the “circumpolar current,” which is larger, wider, and flows clockwise.

Which way it goes depends on the vertical shape and depth of the iceberg, according to NASA scientist emeritus Robert Bindschadler. “Where it is going depends on the deeper currents into which its keel extends,” he said. Researchers have found that larger icebergs with deeper keels tend to drift with the deeper, cyclonic circumpolar current, while sea ice and smaller bergs with shallower keels tend to drift with the coastal counter current.

“If you ever throw a stick into a mountain stream, you would see an erratic flow as it spins, accelerates, and decelerates,” Bindschadler said. “I imagine a similarly variable current field working on the iceberg's keel. This iceberg is like a very, very big stick.”

Pine Island Glacier study or PIG is an active and ongoing project of NASA.
This project’s official title is "Ocean-Ice Interaction in the Amundsen Sea: the Keystone to Ice-Sheet Stability". A real mouthful, but it captures the essence of what we intend to do, where we will do it and why we feel it is important to do it. Various other measurements have captured the West Antarctic ice sheet changing very rapidly in the region where it flows into the Amundsen Sea, one of the sectors of the Southern Ocean. The spatial pattern strongly suggests that the cause of this change is weaker ice shelves, the floating apron of ice that fringe the perimeter of the ice sheet. Our hypothesis is that warm water is melting the undersides of these ice shelves decreasing the "back pressure" from the ice shelves to help hold the ice sheet. Less backpressure means the ice sheet can flow faster. Faster flow-smaller ice sheet-higher sea levels-slow motion coastal flooding worldwide.
There is even more depressing news from the West Antarctica ice shelf, which I will diary soon. Meanwhile, the climate change enablers continue to play their fiddles while our planet burns.

Originally posted to Pakalolo on Mon Nov 18, 2013 at 03:22 PM PST.

Also republished by DK GreenRoots, Climate Change SOS, and Climate Hawks.

Your Email has been sent.
You must add at least one tag to this diary before publishing it.

Add keywords that describe this diary. Separate multiple keywords with commas.
Tagging tips - Search For Tags - Browse For Tags


More Tagging tips:

A tag is a way to search for this diary. If someone is searching for "Barack Obama," is this a diary they'd be trying to find?

Use a person's full name, without any title. Senator Obama may become President Obama, and Michelle Obama might run for office.

If your diary covers an election or elected official, use election tags, which are generally the state abbreviation followed by the office. CA-01 is the first district House seat. CA-Sen covers both senate races. NY-GOV covers the New York governor's race.

Tags do not compound: that is, "education reform" is a completely different tag from "education". A tag like "reform" alone is probably not meaningful.

Consider if one or more of these tags fits your diary: Civil Rights, Community, Congress, Culture, Economy, Education, Elections, Energy, Environment, Health Care, International, Labor, Law, Media, Meta, National Security, Science, Transportation, or White House. If your diary is specific to a state, consider adding the state (California, Texas, etc). Keep in mind, though, that there are many wonderful and important diaries that don't fit in any of these tags. Don't worry if yours doesn't.

You can add a private note to this diary when hotlisting it:
Are you sure you want to remove this diary from your hotlist?
Are you sure you want to remove your recommendation? You can only recommend a diary once, so you will not be able to re-recommend it afterwards.
Rescue this diary, and add a note:
Are you sure you want to remove this diary from Rescue?
Choose where to republish this diary. The diary will be added to the queue for that group. Publish it from the queue to make it appear.

You must be a member of a group to use this feature.

Add a quick update to your diary without changing the diary itself:
Are you sure you want to remove this diary?
(The diary will be removed from the site and returned to your drafts for further editing.)
(The diary will be removed.)
Are you sure you want to save these changes to the published diary?

Comment Preferences

Meteor Blades, Thumb, Sylv, Mogolori, Timaeus, Liberal Thinking, Mike Stark, Gooserock, Rolfyboy6, Powered Grace, PeterHug, bosdcla14, karlpk, Shockwave, Wintermute, Jay C, eeff, MarkInSanFran, JLFinch, missLotus, 88kathy, kalihikane, susakinovember, whenwego, Agathena, highacidity, themank, Aquarius40, farmerhunt, roses, jalbert, Cedwyn, SneakySnu, Miss Jones, CitizenOfEarth, pat bunny, yet another liberal, Steven Payne, defluxion10, Frankenoid, riverlover, walkshills, zerelda, ybruti, boran2, Sassy, oortdust, BoogieMama, rapala, Bluesee, marina, radarlady, Tinfoil Hat, sc kitty, kamarvt, citizenx, dewtx, juliesie, YucatanMan, Laurence Lewis, Claybow, reflectionsv37, Fury, Gordon20024, Burned, lotlizard, hilltopper, antiapollon, Tool, snoopydawg, Rogneid, Box of Rain, Alan Arizona, Jim R, tobendaro, Kimball Cross, raptavio, The Wizard, yojimbo, Lefty Coaster, blueoasis, NBBooks, global citizen, Rosaura, unclebucky, sceptical observer, Up to here, doinaheckuvanutjob, middleagedhousewife, Turbonerd, doingbusinessas, Clive all hat no horse Rodeo, Dianna, Statusquomustgo, MadScientist, Johnathan Ivan, krwheaton, One Pissed Off Liberal, bluicebank, Habitat Vic, tardigrade, Debs2, Stwriley, Wino, blue71340, FishOutofWater, LillithMc, Mary Mike, sfbob, jayden, Back In Blue, jnhobbs, rovertheoctopus, Wreck Smurfy, JDWolverton, GAS, Aureas2, Involuntary Exile, bythesea, elwior, skohayes, VA gentlewoman, Buckeye Nut Schell, KJG52, Its any one guess, VL Baker, jamess, Calamity Jean, Lujane, pickandshovel, Missys Brother, petulans, JamieG from Md, Quilldriver, SolarMom, CA148 NEWS, maggiejean, Louisiana 1976, pileta, soarbird, greengemini, nchristine, welso, CanyonWren, maryabein, War on Error, geebeebee, elziax, brooklynliberal, stevenwag, nancat357, citisven, Larsstephens, Words In Action, Amber6541, parse this, flitedocnm, LaughingPlanet, NJpeach, serendipityisabitch, Crabby Abbey, LOrion, Garfnobl, tb mare, elginblt, paradise50, DiegoUK, morninmist, kenwards, cocinero, nosleep4u, fiercefilms, soaglow, slice, Onomastic, Bluefin, slowbutsure, Hopeful Skeptic, vahana, cv lurking gf, gongee, boomerchick, marleycat, akmk, Ojibwa, smoothnmellow, LSmith, antooo, myrmecia gulosa, Marihilda, too many people, dradams, DRo, Mentatmark, Nancy on Lake Michigan, Azazello, YaNevaNo, anodnhajo, cwsmoke, greenbastard, Siri, IndieGuy, oldcrow, S F Hippie, pimutant, Farkletoo, FaithGardner, 2thanks, CA ridebalanced, belinda ridgewood, BusyinCA, Olkate, New Minas, wxorknot, scilicet, Glen The Plumber, Ray Pensador, Lily O Lady, nomandates, Panacea Paola, atana, goodpractice, weck, ORswede, tampaedski, Catkin, TheDuckManCometh, The Marti, Tfill, dannyboy1, LIcenter, ginimck, agiftagain, 100fishhooks, molepost, TRIS

Subscribe or Donate to support Daily Kos.

Click here for the mobile view of the site