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Investigating the accumulation of sediment in lake Nylandssjön using splines: A piece in the puzzle of reconstructing past climate
Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In this thesis monotone splines are used to investigate how sediment, during a year, accumulates at the bottom of the lake Nylandssjön in northern Sweden. It is confirmed that the accumulation rate changes over the year, with apparent increases around early May and in late summer/early autumn. Explanations for this are searched for in meteorological data resulting in indications of that both the time of the ice break-up of the lake and the precipitation in the area around the lake could be of relevance to the sedimentation process. Investigated is also how this increased understanding of the sedimentation process could be beneficial in the work of reconstructing historical climate using so called varved lake sediment.

Abstract [sv]

I den här uppsatsen används monotona splines för att undersöka hur sediment, under ett år, ansamlas på botten av Nylandssjön i norra Sverige. Efter att ha konstaterat att ansamlingshastigheten varierar under året, med tydliga ökningar under våren och på sensommaren/början av hösten, söks förklaringar till detta i meteorologiska data. Detta resulterar i indikationer på att både tiden för sjöns islossningen och nederbörden i området kring sjön kan vara av relevans för sedimenteringsprocessen. Vidare diskuteras hur denna ökade förståelse för sedimenteringsprocessen kan hjälpa oss i arbetet med att studera så kallade varviga sediment för att förstå hur klimatet förändrats genom historien.

Place, publisher, year, edition, pages
National Category
Probability Theory and Statistics
URN: urn:nbn:se:umu:diva-105520OAI: diva2:847066
Available from: 2015-09-04 Created: 2015-06-24 Last updated: 2015-09-04Bibliographically approved

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