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(English)Manuscript (preprint) (Other academic)
Abstract [en]
We present a peat paleodust and accumulation rates study from Davidsmosse, Halland region, south-west Sweden. The 458 cm peat sequence was studied for peat composition, bulk density, elemental composition and ash content. The results were quantitatively assessed using principal component analysis and related to calendar ages by radiocarbon dating. Local soil and sediments samples from the surrounding area (within 4 km radius) as well as aeolian dunes located closer to the coast (25 km) were analysed for elemental concentrations and mineral content. These results were compared to the minerals on the current bog surface and their similarity suggests that the deposited minerals have a local origin. From the peat paleodust reconstruction fourteen dust events (DE) were recorded (cal BP): 3580–3490; 3280; 3140; 3010–2840; 2740; 2610; 2480; 2340; 2240–2130; 2050; 1890; 1690; 1240; and 960–490. A majority of these events were coupled to increases in peat accumulation rates (13 of 14), indicating a relationship between these two processes. Davidsmosse recorded two longer phases that saw numerous DE with larger inferred grain size between 2800 and 2130 cal BP and a stepwise increase from 1000 towards 490 cal BP. These phases overlap in time with increased storm activity recorded in previous studies, both in nearby bog records as well as from dune records in Denmark, and a coastal bog in Scotland, suggesting storminess as a driver of DE signals at Davidsmosse. These stormier periods are related to colder periods, coupled to extended sea ice south of Iceland and a southward shift in storm tracks. Comparison with peat paleodust records further inland did not register these events, indicating that the location of the bog will affect which type of DE that will be recorded. Those DE found at both coastal and inland sites may represent periods with particularly strong winds, or alternatively, regionally dry phases. Further studies are required to untangle which of these processes are responsible for this pattern, for example by conducting grain size analysis on an event recorded at all three bogs, coupled with high resolution dating.
Keywords
Peat, paleodust, mineralogy, paleostorms, Holocene, Sweden, peat accumulation rates
National Category
Geology
Research subject
Geology
Identifiers
urn:nbn:se:su:diva-192216 (URN)
2021-04-152021-04-152022-02-25Bibliographically approved