Diatom transfer-functions for quantifying past air temperature, pH and total organic carbon concentration from lakes in northern Sweden

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Fältnamn	Indikatorer	Metadata
000		03254naa a2200373 4500
001		oai:DiVA.org:umu-46293
003		SwePub
008		110830s2000 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-462932 URI
024	7	a https://doi.org/10.1023/A:10081280147212 DOI
040		a (SwePub)umu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Rosén, Pu Umeå universitet,Institutionen för ekologi, miljö och geovetenskap4 aut0 (Swepub:umu)pero0001
245	1 0	a Diatom transfer-functions for quantifying past air temperature, pH and total organic carbon concentration from lakes in northern Sweden
264	1	c 2000
338		a print2 rdacarrier
520		a 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.
653		a diatoms
653		a climate change
653		a temperature
653		a pH
653		a transfer functions
653		a lake sediments
653		a northern Sweden
700	1	a Hall, R4 aut
700	1	a Korsman, Tu Umeå universitet,Institutionen för ekologi, miljö och geovetenskap4 aut0 (Swepub:umu)toko0001
700	1	a Renberg, I.u Umeå universitet,Institutionen för ekologi, miljö och geovetenskap4 aut0 (Swepub:umu)inre0001
710	2	a Umeå universitetb Institutionen för ekologi, miljö och geovetenskap4 org
773	0	t Journal of Paleolimnologyg 24:2, s. 109-123q 24:2<109-123x 0921-2728x 1573-0417
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46293
856	4 8	u https://doi.org/10.1023/A:1008128014721

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Av författaren/redakt...: Rosén, P; Hall, R; Korsman, T; Renberg, I.

Artiklar i publikationen: Journal of Paleo ...

Av lärosätet: Umeå universitet

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