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- Rosén, PUmeå universitet,Institutionen för ekologi, miljö och geovetenskap (author)
Diatom transfer-functions for quantifying past air temperature, pH and total organic carbon concentration from lakes in northern Sweden
- Article/chapterEnglish2000
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- 2000
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- LIBRIS-ID:oai:DiVA.org:umu-46293
- https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46293URI
- https://doi.org/10.1023/A:1008128014721DOI
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- Language:English
- Summary in:English
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- The relationships between diatoms (Bacillariophyceae) in surface sediments of lakes and summer air temperature, pH and total organic carbon concentration (TOC) were explored along a steep climatic gradient in northern Sweden to provide a tool to infer past climate conditions from sediment cores. The study sites are in an area with low human impact and range from boreal forest to alpine tundra. Canonical correspondence analysis (CCA) constrained to mean July air temperature and pH clearly showed that diatom community composition was different between lakes situated in conifer-, mountain birch- and alpine-vegetation zones. As a consequence, diatoms and multivariate ordination methods can be used to infer past changes in treeline position and dominant forest type. Quantitative inference models were developed to estimate mean July air temperature, pH and TOC from sedimentary diatom assemblages using weighted averaging (WA) and weighted averaging partial least squares (WA-PLS) regression. Relationships between diatoms and mean July air temperature were independent of lake-water pH, TOC, alkalinity and maximum depth. The results demonstrated that diatoms in lake sediments can provide useful and independent quantitative information for estimating past changes in mean July air temperature (R-jack(2) = 0.62, RMSEP = 0.86 degrees C; R-2 and root mean squared error of prediction (RMSEP) based on jack-knifing), pH (R(j)(2)ack = 0.61, RMSEP = 0.30) and TOC (R-jack(2) = 0.49, RMSEP = 1.33 mg l(-1)). The paper focuses mainly on the relationship between diatom community composition and mean July air temperature, but the relationships to pH and TOC are also discussed.
Subject headings and genre
- diatoms
- climate change
- temperature
- pH
- transfer functions
- lake sediments
- northern Sweden
Added entries (persons, corporate bodies, meetings, titles ...)
- Hall, R (author)
- Korsman, TUmeå universitet,Institutionen för ekologi, miljö och geovetenskap(Swepub:umu)toko0001 (author)
- Renberg, I.Umeå universitet,Institutionen för ekologi, miljö och geovetenskap(Swepub:umu)inre0001 (author)
- Umeå universitetInstitutionen för ekologi, miljö och geovetenskap (creator_code:org_t)
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- In:Journal of Paleolimnology24:2, s. 109-1230921-27281573-0417
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