Direktlänk till inlägg 26 april 2011

Vulkanisk aska luft avstängning "rätt" beslut

Av fiona bolaz - 26 april 2011 09:59

Oro flygplan säkerheten under vulkanen en isländsk vulkan i 2010 var välgrundad, enligt en ny vetenskaplig studie. Aska partiklar från den tidiga fasen av utbrottet var små och riklig, utgör ett potentiellt hot mot flygplan flyger genom molnet. Sådana partiklar kan ha smält inuti jetmotorer, vilket kan orsaka dem att misslyckas i mitten av flygning. Arbetet med en isländsk-danska laget är publiceras i PNAS tidskrift . Fortsätt läsa den viktigaste historien " Starta Citat Partiklarna var så små att de rest en längre sträcka från vulkanen och stannade kvar i det område där flygplan flyger under en mycket längre tid " Susan Stipp Köpenhamns universitet Analysen visar också att aska partiklar från tidigt på utbrottet var särskilt kraftig och slipande. Den outpour av aska från Eyjafjallajökull orsakade den största stängningen av det europeiska luftrummet sedan andra världskriget, med förluster beräknas till mellan 1,5 miljarder och 2,5 miljarder euro. Cirka 10 miljoner resenärer påverkades av avstängningen. Den senaste forskningen har genomförts av forskare vid universitetet i Köpenhamn i Danmark och Islands universitet i Reykjavik. Senior författaren Susan Stipp, från Köpenhamns universitet, till BBC News: "Jag tror de verkligt viktiga delar av den är: Nummer ett var de luftfartsmyndigheter helt rätt i att stänga luftrummet. "Nummer två, har vi presenterat ett protokoll så att om svar behövs snabbt i framtiden, kan de hade. "Då de data som produceras kan sättas in i modeller för att bestämma hur långt, hur hög och hur bred den aska kommer att spridas som kommer att baseras mer på fakta än på gissningar." Forskarna analyserade storlekar och strukturer av aska partiklar med olika tekniker, såsom atomkraftsmikroskopi, svepelektronmikroskopi och röntgendiffraktion.

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