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Observed Ice Supersaturated Layers over Sweden and Implications for Aviation Induced Contrails over the Baltic Sea
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2011 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In the atmosphere vertical extended layers that are in the state of super saturation with respect to ice can appear; these layers have been termed ice-supersaturated layers (ISSL). If an aircraft passes through an ISSL, persistent condensation trails can form. These contrails absorb the long wave radiation from the earth and reflect the incoming short wave radiation from space. The absorbing effect of the long wave radiation is although greater than the reflecting effect of the short wave radiation and therefore these contrails increase the greenhouse effect.This study contain statistics of when ice-supersaturated layers occur in the Swedish airspace, based on data from balloon soundings that take place each day at four locations in Sweden. The soundings that are used in this report were carried out from January 2006 to December of 2010. The results show that ISSL are more common in the Swedish airspace than expected. The layers are by average 42 hPa thick, located at the height of 339 hPa and are present in 44 % of the soundings.

Abstract [sv]

I atmosfären kan det uppkomma vertikalt utsträckta skikt som är övermättade med avseende på is; dessa lager har blivit benämnda som ice-supersaturated layers (ISSL). Om ett flygplan flyger igenom dessa ISSL luftmassor kan permanenta kondensationsstrimmor bildas.Dessa kondensationsstrimmor absorberar den långvågiga strålningen från jorden och reflekterar den inkommande kortvågiga strålningen från rymden. Den absorberande effekten är större än den reflekterande effekten, vilket bidrar till en förstärkning av växthuseffekten. Den här studien innehåller statistik för när dessa ISSL uppkommer i det Svenska luftrummet, baserat på data från ballongsonderingar som var utförda från Januari 2006 till December 2010. Resultatet från denna statistik visar att ISSL är mer vanliga i det Svenska luftrummet än förväntat. Lagren är i medeltal 42 hPa tjocka, placerade på 339 hPa höjd och förekommer i 44 % av sonderingarna.

Place, publisher, year, edition, pages
Examensarbete vid Institutionen för geovetenskaper, ISSN 1650-6553 ; 220
Keyword [en]
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:uu:diva-153694OAI: diva2:417500
Subject / course
Educational program
Master Programme in Physics
Physics, Chemistry, Mathematics
Available from: 2011-05-20 Created: 2011-05-17 Last updated: 2011-05-20Bibliographically approved

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