अंटार्कटिका – Page 3 – आवारा मुसाफिर

World’s largest ice sheet is threatened

April 1, 20221124 Views

Warmer summers and meltwater lakes are damaging the fringes A first-of-its-kind study looking at surface meltwater lakes around the East Antarctic Ice Sheet across a seven-year period has found that the area and volume of these lakes is highly variable year-to-year, and offers new insights into the potential impact of recent climatic change on the ‘Frozen Continent’. The research, led by Durham University (UK), used over 2000 satellite images from around the edge of the East Antarctic Ice Sheet to determine the size and volume of lakes on the ice surface, also known as supraglacial lakes, across seven consecutive years between 2014 and 2020. Meltwater lake near Shackleton Ice Shelf, East Antarctica. Photo: David Small, Durham University The study, which involved Newcastle and ...

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Solar energy explains fast yearly retreat of Antarctica’s sea ice

AWARA MUSAFIR BUREAU

March 29, 2022548 Views

In the Southern Hemisphere, the ice cover around Antarctica gradually expands from March to October each year. During this time the total ice area increases by 6 times to become larger than Russia. The sea ice then retreats at a faster pace, most dramatically around December, when Antarctica experiences constant daylight. New research led by the University of Washington explains why the ice retreats so quickly: Unlike other aspects of its behavior, Antarctic sea ice is just following simple rules of physics. The study was published March 28 in Nature Geoscience. A research vessel in Antarctica on June 3, 2017, the first day researchers saw the sun rise above the horizon after weeks of polar darkness. New research shows that solar radiation drives the relatively fast annual retrea...

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Seals help researchers collect data under Antarctic ice

AWARA MUSAFIR BUREAU

March 1, 2022656 Views

A seal wearing a helmet with an antenna might look unusual, but eight Weddell seals, each with a 580g monitoring device on their heads, have been helping Japanese researchers survey the waters under the thick ice sheet in Antarctica. Tapped for a research project between March and November 2017 - winter in Antarctica - these seals were equipped with the head-mounted conductivity, temperature and depth sensor, which allows scientists to collect observation data, such as water temperatures and salt levels, in areas with extremely harsh environmental conditions. This video grab shows a Weddell seal fitted with high-tech head-mounted measuring devices to survey waters under the thick ice sheet, near Japan's Showa Station in Antarctica, April 2017. National Institute of Polar Research/Ha...

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In Antarctica, a burgeoning krill fishery threaten wildlife!

AWARA MUSAFIR BUREAU

February 26, 2022515 Views

A humpback whale, likely lured by a trawling net capturing masses of Antarctic krill, became entangled last month and died in the Southern Ocean. Three dead juveniles were caught in the same company's krill nets last year. Scientists say the humpbacks may have been malnourished while forced to compete for food with a burgeoning industry harvesting the tiny crustaceans - the linchpin in the Antarctic food web - for use in pharmaceuticals and fish feed. The fishing company, Norway's Aker BioMarine, said these were its first cases of whale bycatch in 15 years of harvesting krill in Antarctica, and that it has since reinforced its ships' devices for keeping marine mammals out of its nets. Pål Skogrand, director of Antarctic affairs and sustainability at Aker BioMarine, said the c...

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How was West Antarctic Ice Sheet formed 35 million years ago!

AWARA MUSAFIR BUREAU

February 23, 20221203 Views

AWI experts confirm that the spread was delayed than previously believed Roughly 35 million years ago, Earth cooled rapidly. At roughly the same time, the Drake Passage formed between South America and the Antarctic, paving the way for the Antarctic Circumpolar Current. Thanks to these two factors, Antarctica was soon completely covered in ice. As a study from the Alfred Wegener Institute now shows, this massive glaciation was delayed in at least one region. This new piece of the puzzle concerning the early history of the West Antarctic Ice Sheet could help to predict its unstable future. The study was just released in the Nature journal Communications Earth & Environment. Overlooking the Polarstern parked next to the floe during melt season. Photo: Alfred-Wegener-Institut / ...

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World’s most famous ‘mega iceberg’ released 152 billion tonnes of fresh water into ocean

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January 22, 2022360 Views

Scientists monitoring the giant A68A Antarctic iceberg from space reveal that a huge amount of fresh water was released as it melted around the sub-Antarctic island of South Georgia 152 billion tonnes of fresh water – equivalent to 20 x Loch Ness or 61 million Olympic sized swimming pools, entered the seas around the sub-Antarctic island of South Georgia when the megaberg A68A melted over 3 months in 2020/2021, according to a new study. In July 2017, the A68A iceberg snapped off the Larsen-C Ice Shelf on the Antarctic Peninsula and began its epic 3.5 year, 4000 km journey across the Southern Ocean. At 5719 square kilometres in extent – quarter the size of Wales –, it was the biggest iceberg on Earth when it formed and the sixth largest on record. Around Christmas 2020, the berg rece...

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Antarctic ice-sheet destabilized within a decade

AWARA MUSAFIR BUREAU

November 20, 2021762 Views

A new Study provides critical insights into ice mass loss in Antarctica After the natural warming that followed the last Ice Age, there were repeated periods when masses of icebergs broke off from Antarctica into the Southern Ocean. A new data-model study led by the University of Bonn (Germany) now shows that it took only a decade to initiate this tipping point in the climate system, and that ice mass loss then continued for many centuries. Accompanying modeling studies suggest that today's accelerating Antarctic ice mass loss also represents such a tipping point, which could lead to irreversible and long-lasting ice retreat and global sea level rise. The study has now been published in the journal Nature Communications. To understand what the consequences of current and futu...

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Antarctica gives birth to world’s largest iceberg

AWARA MUSAFIR BUREAU

May 20, 20211742 Views

A giant slab of ice bigger than the Spanish island of Majorca has sheared off from the frozen edge of Antarctica into the Weddell Sea, becoming the largest iceberg afloat in the world, the European Space Agency said on Wednesday. The newly calved berg, designated A-76 by scientists, was spotted in recent satellite images captured by the Copernicus Sentinel-1 mission, the space agency said in a statement posted on its website with a photo of the enormous, oblong ice sheet. A view of the newly calved iceberg designated A-76 by scientists, the largest currently afloat in the world according to the European Space Agency (ESA), and captured by the ESA's Copernicus Sentinel-1 mission is seen in this handout photo obtained by Reuters on May 20, 2021. ESA/Copernicus Sentinel-1 Mission, CC B...

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Giant iceberg threatens south Atlantic penguin colony island

AWARA MUSAFIR BUREAU

December 10, 20201091 Views

An enormous iceberg is heading toward South Georgia Island in the southern Atlantic, where scientists say a collision could devastate wildlife by threatening the food chain. Scientists have long been watching this climate-related event unfold, as the iceberg - about the same size as the island itself – has meandered and advanced over two years since breaking off from the Antarctic peninsula in July 2017. A view of the A-68A iceberg from a Royal Air Force reconnaissance plane near South George island, November 18, 2020. Picture taken November 18, 2020. UK Ministry of Defence/Handout via REUTERS The peninsula is one of the fastest-warming places on Earth, registering a record high temperature of 20.75 degrees Celsius (69.35 degrees Fahrenheit) on Feb. 9. The warming has scientists ...

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All-female scientific coalition calls for protection of Antarctic Peninsula

AWARA MUSAFIR BUREAU

October 20, 2020467 Views

Climate change and human activity are harming Antarctica and threatening wildlife from humpback whales to microscopic algae, more than 280 scientists and conservation experts say in urging protections for the icy region. The coalition - all women - called for creating a new marine protection area around Antarctica, as governments on Monday began a two-week meeting of the Commission for the Conservation of Antarctic Marine Living Resources. FILE PHOTO: An iceberg floats near Lemaire Channel, Antarctica, February 5, 2020. Picture taken February 5, 2020. REUTERS/Ueslei Marcelino Two Antarctica areas are already protected: The South Orkney Islands and the Ross Sea. The new protection area, proposed in 2018 by commission members Chile and Argentina, would cover the western Antarctic P...