Saturday, July 13, 2019

Global Warming's Apocalypse ?


This Weirdly Geometric Iceberg Is Freaking Us Out

By‭ ‬George Dvorsky

10/23/2018



Well here’s something you don’t see everyday:‭ ‬an iceberg so unbelievably geometric in shape you’d think it was deliberately carved with a gigantic chainsaw.‭ ‬Scientists have documented this sort of thing before,‭ ‬but this latest‭ ‘‬berg,‭ ‬which recently split from Antarctica’s Larsen C ice shelf,‭ ‬happens to be a rather extraordinary example.

What you’re looking at here is a tabular iceberg.‭ ‬Unlike the icebergs of non-tabular variety,‭ ‬such as the irregularly shaped berg that sunk the Titanic,‭ ‬these chunks of ice are distinguished by their flat tops,‭ ‬steep sides,‭ ‬and sometimes massive sizes.‭ ‬At their largest,‭ ‬tabular icebergs can extend for hundreds of miles in length,‭ ‬and reach hundreds of feet below the surface.

NASA scientists spotted this iceberg in Antarctica on October‭ ‬16‭ ‬as part of the Operation IceBridge program—an ongoing mission to monitor polar regions and track the planet’s global climate system.

Tabular icebergs are the remnants of calving events,‭ ‬where a large strip of ice breaks free from an ice shelf.‭ ‬In this case,‭ ‬an uncannily square-shaped iceberg broke away from Larsen C,‭ ‬the same ice shelf that produced the gigantic A-68‭ ‬iceberg back in July‭ ‬2017.‭ ‬Based on its relatively smooth edges and pristine condition,‭ ‬this berg likely only calved very recently,‭ ‬according to NASA.
Speaking to LiveScience,‭ ‬University of Maryland Earth scientist Kelly Brunt compared calving events to a long fingernail that eventually snaps off at the end‭; ‬the process often results in seemingly perfect geometric edges.‭ ‬This berg hasn’t been measured yet,‭ ‬but Brunt says it’s about one mile across‭ (‬1.6‭ ‬kilometers‭)‬,‭ ‬which isn’t not particularly large.‭ ‬By contrast,‭ ‬iceberg A68‭'‬s surface area measured some‭ ‬2,240‭ ‬square miles‭ (‬5,800‭ ‬kilometers‭) ‬at the time of calving.‭ ‬Brunt added that only about‭ ‬10‭ ‬percent of the iceberg’s mass is visible,‭ ‬the rest being underwater.‭ ‬So what you’re seeing here is only the tip of the...uh...you know what.

Needless to say,‭ ‬this photograph isn’t telling us the whole story.‭ ‬It’s doubtful the entire iceberg is perfectly geometric throughout.‭ ‬But who cares—this photo is an instant classic.

‭[‬NASA via LiveScience‭]









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