US News Antarctica: Nasa releases more pics of the trillion tonne iceberg that broke off Larsen C Ice Shelf

11:00  03 october  2017
11:00  03 october  2017 Source:   International Business Times

NASA asteroid probe slingshots round Earth

  NASA asteroid probe slingshots round Earth NASA scientists used a slingshot manoeuvre around the Earth in their mission to land a spacecraft on an asteroid.  Returning to the planet almost a year after its launch, the probe came within 10,711 miles (17,237 km) of Antarctica, before following a route north over the Pacific Ocean.The Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx) has the mission of studying asteroid 101955 Bennu.OSIRIS-REx was launched on the back of an Atlas V rocket from the Cape Canaveral Air Force Station on 8 September 2016.

One trillion -ton Iceberg breaks off Antarctica Reuters. Nasa 's Earth Observatory has released more images of the Larsen C Ice Shelf which was reported to have lost The trillion - tonne iceberg could float away, get stuck, or float backwards.A. Fleming, British Antarctic Survey. More from IBTimes UK.

A February 2017 image of the Larsen C ice shelf in Antarctica made available by the Antarctic Survey on Wednesday 12 July 2017 ( Picture : British Antarctic Survey via AP). The iceberg weighs roughly a trillion tonnes .

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NASA asteroid probe slingshots round Earth

  NASA asteroid probe slingshots round Earth NASA scientists used a slingshot manoeuvre around the Earth in their mission to land a spacecraft on an asteroid.  Returning to the planet almost a year after its launch, the probe came within 10,711 miles (17,237 km) of Antarctica, before following a route north over the Pacific Ocean.The Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx) has the mission of studying asteroid 101955 Bennu.OSIRIS-REx was launched on the back of an Atlas V rocket from the Cape Canaveral Air Force Station on 8 September 2016.

Trillion - tonne iceberg finally snaps off West Antarctic ice shelf , scientists confirm. Giant Iceberg Breaks Off Antarctic Ice Shelf . A trillion -ton iceberg calved off the Larsen ice shelf in Antarctica on Wednesday, July 12.

Trillion -ton iceberg size of Trinidad and Tobago breaks off Antarctica - shelf 'unstable'. Scientists announced today it had calved from the Larsen C Ice Shelf , which has now been reduced in size by 10 per cent.

Nasa's Earth Observatory has released more images of the Larsen C Ice Shelf which was reported to have lost an iceberg four times the size of Manhattan into the sea last month.

As Antarctica's 2017 polar night (polar phenomenon where nights last over 24 hours) comes to an end, the space agency has released clear images showing the size and extent of the damage. Nasa reports that since the break happened in July, they have had to rely solely on thermal images and radar-based data to observe the break and watch the motion of ice.

Larsen C © NASA Earth Observatory Larsen C

The iceberg was named A-68 and by August, the first sunlit images were being captured, says the report. Between 11 and 16 September, more wide view images were captured by Nasa's Terra satellite using its onboard Moderate Resolution Imaging Spectroradiometer (MODIS) and Landsat 8's Operational Land Imager (OLI) and the Thermal Infrared Sensor (TIRS).

NASA asteroid probe slingshots round Earth

  NASA asteroid probe slingshots round Earth NASA scientists used a slingshot manoeuvre around the Earth in their mission to land a spacecraft on an asteroid. Returning to the planet almost a year after its launch, the probe came within 10,711 miles (17,237 km) of Antarctica, before following a route north over the Pacific Ocean.The Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx) has the mission of studying asteroid 101955 Bennu.OSIRIS-REx was launched on the back of an Atlas V rocket from the Cape Canaveral Air Force Station on 8 September 2016.

A 5800sqkm iceberg breaks away from the Larsen C ice shelf in Antarctica . A one trillion tonne iceberg has broken off from an Antarctic ice shelf , changing the shape of the Antarctic Peninsula forever.

A one trillion tonne iceberg – one of the biggest ever recorded - has calved away from the Larsen C Ice Shelf in Antarctica . Map of Larsen C , overlaid with NASA MODIS thermal image from July 12 2017, showing the iceberg has calved.

The sets of images show the icebergs in natural colour as well as in thermal imaging. The rifts between the iceberg and the shelf are clearly visible. The thermal images show the points where the cold shelf ice ends and the warmer ice on the water begins. The report points out that thermal imaging also shows where exactly the thick ice and relatively thinner ice are on the shelf, iceberg, and sea.

Larsen C © NASA Earth Observatory Larsen C

The report says that over the past few weeks of observation scientists have found that the gap between the iceberg and the ice shelf has widened as the winds, currents, and tides are working constantly to move the iceberg into the sea.

This widening comes after an initial back and forth movement suggesting that the iceberg might bump back into Larson C ice shelf.

Larsen C © Provided by IBT Media (UK) Larsen C

Back and forth collisions caused the main iceberg to break off into two large pieces which were named A-68A and A-68B. Other, smaller pieces that remain unnamed was also spotted in the water, some of them sharp and defined, moving north, says the report.

The larger pieces have been smoothed and rounded off by wind and gravity, but small pieces are still sharp and battered by them crashing and being tossed in the water.

Antarctic ice shelves are melting from within as well, making them a lot more fragile says ESA .
The European Space Agency (ESA) has discovered that large "canyons" are being carved out within Antarctic ice shelves due to the ice melting from inside. This discovery was made after studying data from the CryoSat and Sentinel-1 satellite missions, the space agency said.

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