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Antarctica's Pine Island Glacier is speeding up again as its ice shelf is breaking up, and scientists say they've underestimated how quickly it may disappear. ....
Australian Antarctic Division New research shows that ‘explosive’ cyclones off Antarctica, caused by increasing extreme atmospheric events, can contribute to ice shelf calving and, ultimately, sea level rise. This series of MODIS satellite images show a major rift moving in the direction of ice flow on the Amery Ice Shelf, with radial rifts extending west (T1) and east (T2) from the main rift. After two explosive twin cyclone events on the 19th and 21-24 September 2019, wind and wave action caused the T1 rift to expand, leading to the calving of iceberg D28 from the shelf front on 25 September – the largest local calving event since the early 1960s. Photo: NASA Worldview ....
Abu Dhabi: Researchers in Abu Dhabi have unravelled a more than 40-year-old scientific mystery about why a body of unfrozen ocean has appeared within a thick body of ice during Antarctica’s winter. Known as a polynya event, this creation of the water bodies within ocean ice has occurred twice in the Weddell Sea in Antarctica once in 1973 and again in 2017. Scientists at Khalifa University’s Environmental and Geophysical Sciences (ENGEOS) lab have discovered that synoptic-scale atmospheric rivers (AR) emerging from the tropics and spreading poleward into the Antarctic Ice Sheet are actually initiating this phenomenon. Anomalous increase in surface temperature was induced by the atmospheric rivers over the ice pack, which caused melting and thinning of the ice, further leading to the opening of what is known as the ‘Polynya’ event. ....