huge iceberg breaks from ice shelf in antarctica
words: about 300; time: 5 minutes
a huge iceberg with twice the volume (容积) of lake erie has broken off from a key floating (漂浮的) ice shelf in antarctica, scientists said wednesday.
the iceberg broke off from the larsen c ice shelf, scientists at the swansea university in britain said. the iceberg is said to weigh about a trillion tons.
the process, known as calving, happened in the past few days, when a 2,240-square-mile part broke away.
“we have been expecting this event for months and have been surprised how long it took for the rift (裂口) to break through the final few kilometers of ice,” said adrian luckman of swansea university. “we will continue to monitor both the influence of this event on the larsen c ice shelf and the future of this huge iceberg.”
scientists said the latest iceberg break won’t affect sea levels in the short term.
nasa and european space agency satellites (卫星) have been watching the shelf and producing pictures of the break that have heightened interest beyond the scientific community. the final break was first shown in a thermal infrared image (热红外影像) from nasa’s modis satellite instrument.
scientists from the britain-based antarctic project midas have been monitoring the rift in larsen c for years. the project describes the iceberg as one of the largest ever recorded.
the researchers say that the iceberg is likely to break into small pieces and that while some of the ice may stay nearby for years, parts of it may float into warmer waters. they say much more study needs to be done to determine the cause of the break.
“at this point it would be too early to say that this was caused by global warming,” said anna hogg of the center for polar observation and modeling at the university of leeds.
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