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| 3. |
- Houmark-Nielsen, Michael, et al.
(författare)
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Evidence of ameliorated Middle Weichselian climate and sub-arctic environment in the western Baltic region : coring lake sediments at Klintholm, MOn, Denmark
- 2016
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Ingår i: Boreas. - : Wiley. - 0300-9483 .- 1502-3885. ; 45:2, s. 347-359
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Tidskriftsartikel (refereegranskat)abstract
- Coring through glaciotectonically stacked Quaternary sediments situated below sea level on the island of MOn, Denmark, recovered a succession of interstadial sediments of Middle Weichselian age. Plant and animal remains including insects found in laminated sand and mud indicate deposition in a lake surrounded by dwarf shrubs, herbs, mosses and rare trees. The insect fauna indicates a mean July temperature of 8-12 degrees C, suggesting an arctic to sub-arctic environment, while winter temperatures around -8 to -22 degrees C suggest periglacial conditions with permafrost. Luminescence dating of sediment samples gave ages from 48-29ka, and radiocarbon dating indicates deposition of plant fragments between 45 and 36ka BP. The fossil assemblage from MOn shows close resemblance to those from other sites with similar ages found in the vicinity of the western Baltic Basin.
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| 5. |
- Parducci, Laura, et al.
(författare)
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Glacial Survival of Boreal Trees in Northern Scandinavia
- 2012
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 335:6072, s. 1083-1086
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Tidskriftsartikel (refereegranskat)abstract
- It is commonly believed that trees were absent in Scandinavia during the last glaciation and first recolonized the Scandinavian Peninsula with the retreat of its ice sheet some 9000 years ago. Here, we show the presence of a rare mitochondrial DNA haplotype of spruce that appears unique to Scandinavia and with its highest frequency to the west-an area believed to sustain ice-free refugia during most of the last ice age. We further show the survival of DNA from this haplotype in lake sediments and pollen of Trondelag in central Norway dating back similar to 10,300 years and chloroplast DNA of pine and spruce in lake sediments adjacent to the ice-free Andoya refugium in northwestern Norway as early as similar to 22,000 and 17,700 years ago, respectively. Our findings imply that conifer trees survived in ice-free refugia of Scandinavia during the last glaciation, challenging current views on survival and spread of trees as a response to climate changes.
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| 6. |
- Parducci, Laura, et al.
(författare)
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Response to Comment on "Glacial Survival of Boreal Trees in Northern Scandinavia"
- 2012
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 338:6108, s. 742-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Birks et al. question our proposition that trees survived the Last Glacial Maximum (LGM) in Northern Scandinavia. We dispute their interpretation of our modern genetic data but agree that more work is required. Our field and laboratory procedures were robust; contamination is an unlikely explanation of our results. Their description of Endletvatn as ice-covered and inundated during the LGM is inconsistent with recent geological literature.
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| 7. |
- Ukkonen, Pirkko, et al.
(författare)
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MIS 3 mammoth remains from Sweden - implications for faunal history, palaeoclimate and claciation chronology
- 2007
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Ingår i: Quaternary Science Reviews. - : Elsevier BV. - 0277-3791. ; 26, s. 3081-3098
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Forskningsöversikt (refereegranskat)abstract
- The distribution of low-arctic megafaunal remains in time and space from the area previously covered by the Scandinavian Ice Sheet(SIS) suggests the presence of breeding mammoth populations in the circum-Baltic region during the time interval from 44 to 26 ka ago. The transport history of 30 mammoth teeth and bones from southern and north-central Sweden was estimated and the remains were subjected to osteological analyses and 14C dating. Oxygen isotope analyses of tooth enamel indicate a palaeoclimate considerably more homogenous than that experienced in Sweden today, showing moderate north–south gradients in the d18O value of precipitation and temperature. In general, the results support the model of restricted ice sheet distribution during the second half of the Middle Weichselian. The clear discrepancy in the inferred absence of glaciation in the central Swedish uplands and the Baltic basin as evidenced by the Swedish mammoth data versus the Danish OSL-based glaciation chronology in the period from 40 to 30 ka ago is discussed in the light of radiocarbon calibration and glacial dynamics. r 2007 Published by Elsevier Ltd.
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| 8. |
- Wohlfarth, Barbara, et al.
(författare)
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Quaternary of Norden
- 2008
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Ingår i: Episodes. - 0705-3797. ; 31:1, s. 73-81
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Konferensbidrag (refereegranskat)abstract
- Nordic countries have experienced multiple glaciations and intervening interglacials during the last ca. 2.5-3 million years. Although evidence from Greenland and Iceland shows that ice sheets started to expand some time before 3 Ma, little is known about the glaciations and intervening interglacials older than the last Glacial Maximum due to repeated phases of glacial erosion and reworking. The extensive Saalian glaciation (c. 140 ka BP) contributed to high sea levels in Greenland and in the Baltic area during the early part of the last interglacial (Eemian). Temperatures were about 5 C higher during the Eemian than they are today and the Greenland ice sheet was reduced to about half of its present size, causing globally higher sea levels than we have today. Ice extent in Fennoscandia was restricted during early Weichselian stadials, but middle Weichselian ice advances in Scandinavia reached as far as Denmark. During the Last Glacial Maximum, large ice sheets were present in all Nordic countries and coalesced with neighboring ice sheets. Deglaciation commenced around 17-15 ka BP in most areas and was promoted by rapidly rising global sea level and glacial isostasy. The Younger Dryas cold event(c. 12.6-11.5 ka BP) is seen as a short-term re-advance, still-stand or fluctuation of land-based ice sheet margins. Around 7-9 ka BP ice sheets had disappeared or had attained their present size. While uplift is still going on in some regions, others are subject to submergence. The different stages of development of the Baltic Sea are an example of how the intricate interplay between glacial eustasy and isostasy influences sedimentation, basin size and drainage patterns.
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| 9. |
- Wohlfarth, Barbara, et al.
(författare)
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Quaternary of Norden
- 2008
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Ingår i: Episodes. ; 31:1, s. 73-81
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Tidskriftsartikel (refereegranskat)
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