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| Titel |
Increased aeolian activity during humidity shifts as recorded in a raised bog in south-west Sweden during the past 1700 years |
| VerfasserIn |
R. Jong, K. Schoning, S. Björck |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 3, no. 3 ; Nr. 3, no. 3 (2007-07-13), S.411-422 |
| Datensatznummer |
250001070
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| Publikation (Nr.) |
 copernicus.org/cp-3-411-2007.pdf |
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| Zusammenfassung |
| Analyses of testate amoebae and aeolian sediment influx (ASI) were used to
reconstruct effective humidity changes and aeolian activity in the coastal
zone of south-west Sweden. Cores were taken from an ombrotrophic peat
sequence from the Undarsmosse bog. Since both types of analysis were carried
out on the same core, a direct comparison between humidity fluctuations in
the bog and aeolian activity was possible, potentially providing detailed
information on atmospheric circulation changes in this region. Relatively
wet bog surface conditions occurred from around 1500 to 1230 and 770 to 380
cal. yrs BP, whereas dry conditions dominated from ca. 1630 to 1530, 1160 to
830 and 300 to 50 cal. yrs BP. The transitions between these phases occurred
within 60–100 years and are characterised by a major change in the testate
amoebae assemblages. A watertable reconstruction was used to study the
hydrological changes at the bog surface in more detail. ASI peak events were
reconstructed around 1450, 1150, 850 and after 370 cal. yrs BP. Most
interestingly, these aeolian activity peaks started during the recorded
hydrological transitions, regardless of the direction of these shifts. Our
results therefore suggest that humidity shifts in this region were
associated with temporary intensifications of atmospheric circulation during
the past 1700 years. Several ASI peaks apparently coincide with reduced
solar activity, possibly suggesting a solar related cause for some of the
observed events. |
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