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Influence of micro-...
Influence of micro-site conditions on tree-ring climate signals and trends in central and northern Sweden
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Duethorn, Elisabeth (author)
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- Holzkämper, Steffen (author)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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Timonen, Mauri (author)
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Esper, Jan (author)
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(creator_code:org_t)
- 2013-06-09
- 2013
- English.
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In: Trees. - : Springer Science and Business Media LLC. - 0931-1890 .- 1432-2285. ; 27:5, s. 1395-1404
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Tree-ring chronologies are important indicators of pre-instrumental, natural climate variability. Some of the longest chronologies are from northern Fennoscandia, where ring width measurement series from living trees are combined with series from sub-fossil trees, preserved in shallow lakes, to form millennial-length records. We here assess the recent ends of such timeseries by comparing climate signals and growth characteristics in central and northern Sweden, of (1) trees growing at lakeshore micro-sites (representing the source of sub-fossil material of supra-long chronologies), with (2) trees collected in dryer micro-sites several meters inland. Calibration trials reveal a predominating June-September temperature signal in N-Sweden and a weaker but significant May-September precipitation signal in C-Sweden. At the micro-site level, the temperature signal in N-Sweden is stronger in the lakeshore trees compared to the inland trees, whereas the precipitation signal in C-Sweden remains unchanged among the lakeshore and inland trees. Tree-rings at cambial ages > 40 years are also substantially wider in the lakeshore micro-site in C-Sweden, and juvenile rings are more variable (and wider) in the dryer micro-site in N-Sweden (compared to the adjacent micro-sites). By combining the data of the various micro-sites with relict samples spanning the past 1,000 years, we demonstrate that growth rate differences at the micro-site scale can affect the low frequency trends of millennial-length chronologies. For the supra-long chronologies from northern Fennoscandia, that are derived from sub-fossil lake material, it is recommended to combine these data with measurement series from only lakeshore trees.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Tree growth
- Tree-ring width
- Pinus sylvestris L.
- Climate reconstruction
- Dendroclimatology
- Scandinavia
Publication and Content Type
- ref (subject category)
- art (subject category)
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