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Showing result 1 - 5 of 13 essays matching the above criteria.
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1. Investigating surface spring snow : Changes in the isotopic composition and conductivity along an orographic precipitation gradient in northern Fennoscandia
University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskapAbstract : Stable isotopes of oxygen (O18) and hydrogen (H2) are used as proxies of past climates when ice preserved in the polar icecaps. The main assumption when doing paleoclimatic reconstructions using these isotopes is that the isotopic composition of the snow that turned into ice reflect the present temperature of the planet during deposition. READ MORE
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2. Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting
University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskapAbstract : With warming in soils due to climate change, a series of secondary factors arise, which have multifaceted effects on soil microbial communities. Of these, alterations to soil moisture are among the most crucial to understanding how microbial functions will change in the face of climate change. READ MORE
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3. The evaluation of preparation techniques for the measurements of hydrogen isotope ratios in ecology
University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskapAbstract : The stable isotope ratio of non-exchangeable hydrogen (δ2Hn) emerged as a promising new tool for source attribution in aquatic ecology, which can better discriminate between the organic matter sources. However, determining the absolute isotopic values is problematic due to the functional groups with hydrogen (H) that can easily exchange with the ambient water. READ MORE
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4. An annual evaluation of CH4 oxidation in a freshwater lake
University essay from Linköpings universitet/Tema MiljöförändringAbstract : Freshwater lakes constrain its methane (CH4) emissions through CH4 oxidation. CH4 includes three carbon (C) isotopes; the stable isotopes 12C,13C and the unstable and more uncommon isotope 14C. Methanotrophs (i.e. READ MORE
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5. Påverkar klimatförändringen trofisk fraktionering av C och N mellan växt och konsument i sötvattenekosystem?
University essay from SLU/Dept. of Aquatic Sciences and AssessmentAbstract : Temperaturhöjningen som en följd av klimatförändringen väntas gå fortast och bli störst på Nord- och Sydpolen. När lufttemperaturen stiger, stiger även vattentemperaturer och vegetationsgränser flyttas. Detta skulle kunna vara orsaken till den näringsutarmning som kan ses i många arktiska sjöar. READ MORE