Development of an Eemian (MIS 5e) Interglacial palaeolake at Sokli (N Finland) inferred using multiple proxies

Plikk, Anna; Helmens, Karin F.; Fernández‐Fernández, María; Kylander, Malin E.; Löwemark, Ludvig; Risberg, Jan; Salonen, J. Sakari; Väliranta, Minna; Weckström, Jan

doi:10.1016/j.palaeo.2016.09.008

Cited by 12 publications

(55 citation statements)

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“…C. ambigua is generally considered an indicator of cold conditions but has been found to dominate the assemblage also in temperate lakes (Brodersen and Lindegaard 1999). Here and in previous studies from Sokli (Plikk et al 2016;Shala et al 2017) it can be associated with the occurrence of Myriophyllum. The high abundance of other taxa associated with submerged macrophytes also suggests clear water conditions during zone Ch1.…”

Section: Ecological Interpretationsupporting

confidence: 78%

“…Most taxa of the fossil record, and especially the most common ones such as C. ambigua, C. mancus-type and T. mendax-type, frequently occur in the calibration datasets. The nearabsence of Zalutschia, a genus indicative of lower pH (Brundin 1949;Walker et al 1985), can be seen as an indication of the interpreted high pH of this lake resulting from the particular bedrock conditions of the Sokli site (Plikk et al 2016). The high abundance of eutrophic C. mancus-type and to a lesser extent E. albipennis-type suggests a relatively nutrient-rich lake.…”

Section: Ecological Interpretationmentioning

confidence: 98%

“…The samples above 1631 cm yielded a low number of head capsules and individual findings are indicated with a (?). Grey bars (VE and TE) correspond to the Värriö and Tunturi cooling events, as outlined in Helmens et al (2015), Plikk et al (2016) and Salonen et al (2018) The ages for the beginning and end of our record are based on the onset and end of interglacial conditions as determined from stalagmites from northern Sweden, Belgium and the Alps (Salonen et al 2018). A recent U/Th dating of a stalagmite from the Korallgrottan Cave in northern Sweden indicates deglaciation of southern and central Fennoscandia by 130.1 kyr BP (Personal communication: Frank, N. Institute of Environmental Physics, Heidelberg, Germany).…”

Section: Timing Of the Last Interglacial At Soklimentioning

confidence: 99%

“…No statistically significant zones were identified, which probably can be attributed to the low variation in the dominant taxa. Therefore, we divide the data into four main zones (Ch1-4) distinguished in the cluster analysis, and two subzones representing two previously reported cooling/drying events, the Tunturi and Värriö (E2) events (Helmens et al 2015;Plikk et al 2016;Salonen et al 2018) (Fig. 2).…”

Section: Chironomid Stratigraphymentioning

confidence: 99%

“…To identify the effects of confounding variables, the reconstructions needs to be evaluated against other paleoecological data and independent climate records (Birks et al 2010). Based on multiproxy data (diatoms, non-pollen-palynomorphs, pollen and macrofossils of aquatic and terrestrial plants, geochemistry), Plikk et al (2016) and Kylander et al (2018) have shown that the Eemian paleolake at Sokli was a relatively nutrient-rich lake affected by infilling and associated changes in stratification, mixing and nutrient recycling over the course of lake development. The influence of these variables on the chironomid assemblage and the following reconstruction therefore needs to be thoroughly evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Chironomid-based temperature reconstruction for the Eemian Interglacial (MIS 5e) at Sokli, northeast Finland

et al. 2019

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The Last Interglacial (Eemian, MIS 5e) can be considered a test-bed for climate dynamics under a warmer-than-present climate. In this study we present a chironomid record from the high latitude Sokli site (N Finland), where a long continuous sediment sequence from the last interglacial has been preserved from glacial erosion. The chironomidanalysis shows a diverse fauna, with dominance of warm-water indicators and shifts in assemblage composition that can be attributed to temperature, lake depth, productivity and habitat availability. Quantitative mean July paleotemperature estimates based on the chironomid data indicate overall mean July air temperatures up to 1°C warmer than present. Two cooling events can be discerned, the Tunturi event, dated to about 127.5 ka BP, in the lower part of the sequence, and the Värriö event, dated to about 119 ka BP, associated with the beginning of a cooling trend in the upper part of the record. Warm conditions already at the onset of the interglacial contrast with a recent chironomid-based last interglacial temperature reconstruction from Denmark, which suggests a late onset of Eemian warming. The relatively small increase in inferred temperatures compared to present day temperatures at Sokli differs from other high latitude Eemian sites, and likely reflects the influence of the Atlantic Meridional Overturning Circulation in maintaining already elevated temperatures in Fennoscandia during interglacials.

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Section: Ecological Interpretationsupporting

confidence: 78%

Section: Ecological Interpretationmentioning

confidence: 98%