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- Wohlfarth, B, et al.
(författare)
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Unstable early-Holocene climatic and environmental conditions in northwestern Russia derived from a multidisciplinary study of a lake-sediment sequence from Pichozero, southeastern Russian Karelia
- 2004
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Ingår i: The Holocene. - : SAGE Publications. - 0959-6836 .- 1477-0911. ; 14:5, s. 732-746
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Tidskriftsartikel (refereegranskat)abstract
- A sediment core from Lake Pichozero (61degrees46'; N, 37degrees25'; E 118 m a.s.l.) provides information on the environmental and climatic conditions in southeastern Russian Karelia during the Lateglacial and early Holocene (12800-9300 cal. BP). The chronology of the sequence is constrained by varve counting and AMS C-14 measurement of terrestrial plant macrofossils. Multiproxy analyses (magnetic susceptibility, grain size, TOC, TN, TS, Rock Eval, pollen and macrofossils) imply that cold and dry regional climatic conditions with sparse Arctic vegetation prevailed prior to 11500 cal. BP. Coincident with the transition to the Holocene at 11500 cal. BP, air temperatures and lake productivity increased and Betula pubescens and Populus tremula started to migrate into the area, followed by Picea abies at 10750 cal. BP. Although lake productivity decreased at around 11000 cal. BP and remained low until 9600 cal. BP, pollen-based climate reconstructions imply variable climatic conditions in the region over time. Drier and colder summers prevailed from similar to11200 to 10900 cal. BP, followed by an interval of higher annual temperatures and precipitation from 10900 to 10750 cal. BP. Lower annual temperatures and drier conditions existed from 10750 to 10200 cal. BP, and higher temperatures and precipitation are inferred between 10200 and 10000 cal. BP. Finally, declining temperatures and precipitation occurred from 10000 cal. BP onwards, with a minimum at around 9600 cal. BP. These climatic shifts are temporally coincident with those recorded in North Atlantic terrestrial, marine and ice-core archives and indicate that relatively minor climate signals were transmitted further to the east.
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- Avery, Rachael S., et al.
(författare)
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A 725-year integrated offshore terrestrial varve chronology for southeastern Sweden suggests rapid ice retreat ~ 15 ka BP
- 2021
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Ingår i: Boreas. - : Wiley. - 0300-9483 .- 1502-3885. ; 50:2, s. 477-496
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Tidskriftsartikel (refereegranskat)abstract
- The Swedish Varve Chronology is an unparalleled tool for linking the deglacial history of Sweden with associated palaeo-environmental change at an annual time scale, and it forms part of Sweden's cultural heritage. A full deglacial chronology connected to the present day does not yet exist; a notable gap is in southeasternmost Sweden, where few varved records are successfully connected to reconstruct ice-margin retreat. Deglaciation in southern Sweden covers both the climate transition to the Bølling warm period (similar to 14.7 ka BP) and the ice-margin transition from a subaqueous to terrestrial terminus. To facilitate investigations into the links between ice-margin dynamics and abrupt climate change, we revisited the varve chronologies of southern Sweden. We digitized unpublished records, reanalysed existing varve thickness records, and obtained and analysed new varve series both on land and offshore. This combined approach has enabled us to refine and extend the existing south coast chronology east and 78 km northwards. Our new Skåne-Småland chronology records 725 years of deglaciation, in addition to a younger floating chronology in parts. This chronology suggests that the glacial-lake terminating Fennoscandian Ice Sheet in southern Sweden initially retreated northwards at similar to 110-160 m a(-1) slowing to 60-70 m a(-1) near the palaeo-shoreline. Between today's mainland and the (now) island of Öland the retreat rates increase three- to fivefold. Ice-margin retreat was initially oriented towards the north (as along the south coast), but later pivoted towards the northwest, signifying a landward retreat of terrestrial 'Swedish' ice that became divorced from the Baltic Sea ice-sheet catchment. Our new 725-year-long varve thickness series reveals repeated multidecadal scale episodes of increased sedimentation. These likely signify phases of enhanced ice-sheet melting that repeat and persist throughout the deglaciation of Skåne-Småland.
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- Laurent, Torvald C., et al.
(författare)
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Urinary excretion of hyaluronan in man
- 1987
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Ingår i: Scandinavian Journal of Clinical and Laboratory Investigation. - 0036-5513 .- 1502-7686. ; 47:8, s. 793-799
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Tidskriftsartikel (refereegranskat)abstract
- A specific assay for hyaluronan (hyaluronic acid) has been applied to the determination of the polysaccharide in urine. The excretion in 22 healthy subjects was 330 micrograms/24 h (SD 77). The excretion was correlated with body weight and was therefore somewhat higher in males than in females. The molecular weight of the main fraction of urinary hyaluronan was in the range of 4000 to 12,000 in accordance with the hypothesis that it originates from blood and arises by glomerular filtration. A small fraction was of higher molecular weight and could have been produced in the urinary tract. Hyaluronan in male and female urine displayed the same molecular weight distributions. Patients with rheumatoid arthritis and primary biliary cirrhosis showed a two-fold and three-fold increase, respectively, of hyaluronan in urine with concurrently high levels of the polysaccharide in serum. A patient with Werner's syndrome displayed a ten-fold increase of the polysaccharide in both serum and urine.
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- Macleod, A., et al.
(författare)
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Lateglacial cryptotephra detected within clay varves in Ostergotland, south-east Sweden
- 2014
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Ingår i: Journal of Quaternary Science. - : Wiley. - 0267-8179 .- 1099-1417. ; 29:7, s. 605-609
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Tidskriftsartikel (refereegranskat)abstract
- Here we present a 710-year-long floating varve record from south-east Sweden. Tephra analyses confirm the presence of the rhyolitic Vedde Ash preserved within two consecutive varve years, confirming the Younger Dryas age of the varve series. This permits, for the first time, direct correlation of Swedish varved clay with other records of equivalent resolution which also preserve the Vedde Ash and demonstrates that the potential exists to independently date the Swedish Timescale. This discovery will allow direct comparison of rates, timing and duration of key climatic events across Europe and the North Atlantic region in records of equivalent resolution.
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