NASA scientist have used methamphetamine hydrochloride - penetrating radar to create a remarkable visual image of the many fixed layers that constitute Greenland ’s expansive ice sheet .
Prior to the new analysis , scientists who wanted to study the glass sheet had to practise down into it . By overstretch up core samples , investigator were capable to detect signs of past snow accumulation and temperature , while also observing dross like dust and volcanic ash tree . But this sampling proficiency does not bestow itself well to acquiring a “ heavy picture ” view of the sheet ’s inside .
The new technique , which relies on radar signal , channelize into the ice from a plane and reflected back , is finally allow scientists to valuate the sparkler surface , sub - chicken feed fundamentals , and layers within the trash on a much big scale
Using the technique , the scientists were able to map the three most prominent features of the 100,000 year - old ice tabloid , each of which harbors clues about a distinct portion of climatic story . The top layer , which formed during the Holocene , is shown in green ; the midway layer , which formed during the last ice long time , is shown in blue ; and the bottom stratum , which formed during the Eemian period , is shown in red .
Interestingly , the Eemian occurred during a period of warmth — a phase like to the one we ’re experiencing today . And indeed , the sheet is presently melting at an alarming rate . There ’s so much ice packed into the Methedrine mainsheet that if it all unfreeze , it is estimate the Earth ’s oceans would rise by about 20 foot ( 6 meters ) .
https://gizmodo.com/greenlands-ice-sheet-melting-faster-than-weve-ever-seen-5928966
[ NASA ]
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