[null, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82392/PineIslandGlacier_oli_2013317.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82392/PineIslandGlacier_oli_2013317.jpg", "formatted_filename": "PineIslandGlacier oli", "alt_text": "Major Iceberg Cracks off Pine Island Glacier"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82392/PineIslandGlacier_oli_2013301.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82392/PineIslandGlacier_oli_2013301.jpg", "formatted_filename": "PineIslandGlacier oli", "alt_text": "Major Iceberg Cracks off Pine Island Glacier"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82392/PineIslandGlacier_oli_2013317.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82392/PineIslandGlacier_oli_2013317.jpg", "formatted_filename": "PineIslandGlacier oli"}, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82392/PineIslandGlacier_oli_2013301.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82392/PineIslandGlacier_oli_2013301.jpg", "formatted_filename": "PineIslandGlacier oli"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "/img/detailMap.jpg", "src": "https://earthobservatory.nasa.gov/img/detailMap.jpg", "formatted_filename": "detailMap", "alt_text": "Location"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82325/Blackforest_tm4_1985174_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82325/Blackforest_tm4_1985174_tn.jpg", "formatted_filename": "Blackforest tm tn", "alt_text": "Building in Colorado\u2019s Fire Zone, Part 2"}, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82405/gfc_emt_2000-2012_se_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82405/gfc_emt_2000-2012_se_tn.jpg", "formatted_filename": "gfc emt se tn", "alt_text": "New Map Yields Better View of Forest Changes"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/1000/1300/PIA02650_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/1000/1300/PIA02650_tn.jpg", "formatted_filename": "PIA tn", "alt_text": "Pine Island Glacier, Antarctica"}, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/8000/8384/pineisland_l7_lima_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/8000/8384/pineisland_l7_lima_tn.jpg", "formatted_filename": "pineisland l lima tn", "alt_text": "Pine Island Glacier, Antarctica"}, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/48000/48637/pineisland_bathmetry_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/48000/48637/pineisland_bathmetry_tn.jpg", "formatted_filename": "pineisland bathmetry tn", "alt_text": "Channel Beneath Pine Island Glacier"}, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/76000/76308/PineIslandGlacier_dms_2011299_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/76000/76308/PineIslandGlacier_dms_2011299_tn.jpg", "formatted_filename": "PineIslandGlacier dms tn", "alt_text": "Birth of an Iceberg"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/83000/83519/pig_amo_2014070_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/83000/83519/pig_amo_2014070_tn.jpg", "formatted_filename": "pig amo tn", "alt_text": "Drifting with Ice Island B31"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/83000/83678/pineisland_tmo_2014100_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/83000/83678/pineisland_tmo_2014100_tn.jpg", "formatted_filename": "pineisland tmo tn", "alt_text": "B31 Iceberg in Darkness"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/81000/81674/pineisland_ast_2013195_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/81000/81674/pineisland_ast_2013195_tn.jpg", "formatted_filename": "pineisland ast tn", "alt_text": "New Ice Island at Pine Island Glacier"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/91000/91203/pineisland_oli_2017296_tn.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/91000/91203/pineisland_oli_2017296_tn.jpg", "formatted_filename": "pineisland oli tn", "alt_text": "The Quick Demise of B-44"}, null, {"document_url": "https://earthobservatory.nasa.gov/images/82392/major-iceberg-cracks-off-pine-island-glacier", "unformatted_src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/144000/144212/pineislandglacier_oli_2018311_th.jpg", "src": "https://eoimages.gsfc.nasa.gov/images/imagerecords/144000/144212/pineislandglacier_oli_2018311_th.jpg", "formatted_filename": "pineislandglacier oli th", "alt_text": "View More Related Images"}, null]
Major Iceberg Cracks off Pine Island Glacier November 13, 2013JPEG October 28, 2013JPEG 




Between November 9–11, 2013, a large iceberg finally separated from the calving front of Antarctica’s Pine Island Glacier. Scientists first detected a rift in the glacier in October 2011 during flights for NASA’s Operation IceBridge. By July 2013, infrared and radar images indicated 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.

The Operational Land Imager on the Landsat 8 satellite acquired natural-color images of the iceberg in Pine Island Bay on November 13 and October 28, 2013. Clouds and fog make the November 13 image a bit hazy, but the open-water gap between the iceberg and the ice shelf is still apparent. Click here for a wider view of the iceberg from November 10, just after the separation.

“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.”

But before any of that drifting occurs, Iceberg B-31 has to get out of Pine Island Bay. “It takes a bit of energy and time to move these guys into the Southern Ocean,” Brunt added. “Many icebergs in Pine Island Bay have persisted for years before exiting, so this could be a long waiting game.”

NASA Earth Observatory images by Holli Riebeek, using Landsat 8 data from the USGS Earth Explorer. Caption by Michael Carlowicz. Landsat 8 captures a view of the ice separating from the ice shelf.

Image of the day for November 15, 2013


Image of the Day Snow and Ice World of Change Sea and Lake Ice
 Crack in the Pine Island Glacier

In mid-October 2011, NASA scientists discovered a crack in Antarctica’s Pine Island Glacier, where a new iceberg is getting ready to break off.
 
Drifting with Ice Island B31 B31 Iceberg in Darkness New Ice Island at Pine Island Glacier The Quick Demise of B-44