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Stable isotope records for the last 10 000 years from Okshola cave (Fauske, northern Norway) and regional comparisons
- Linge, Henriette (author)
- Lauritzen, Stein Erik (author)
- Andersson, Carin (author)
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- Hansen, J. K. (author)
- Skoglund, R. Ø. (author)
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- (creator_code:org_t)
- 2009
- 2009
- English.
- In: Climate of the Past. - 1814-9324. ; 5:4, s. 667-682
- Journal article (peer-reviewed)
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- The sensitivity of terrestrial environments to past changes in heat transport is expected to be manifested in Holocene climate proxy records on millennial to seasonal timescales. Stalagmite formation in the Okshola cave near Fauske (northern Norway) began at about 10.4 ka, soon after the valley was deglaciated. Past monitoring of the cave and surface has revealed stable modern conditions with uniform drip rates, relative humidity and temperature. Stable isotope records from two stalagmites provide time-series spanning from c. 10 380 yr to AD 1997; a banded, multi-coloured stalagmite (Oks82) was formed between 10 380 yr and 5050 yr, whereas a pristine, white stalagmite (FM3) covers the period from ~7500 yr to the present. The stable oxygen isotope (δ18Oc), stable carbon isotope (δ13Cc), and growth rate records are interpreted as showing i) a negative correlation between cave/surface temperature and δ18Oc, ii) a positive correlation between wetness and δ13Cc, and iii) a positive correlation between temperature and growth rate. Following this, the data from Okshola show that the Holocene was characterised by high-variability climate in the early part, low-variability climate in the middle part, and high-variability climate and shifts between two distinct modes in the late part.
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