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| Titel |
The Little Ice Age: evidence from a sediment record in Gullmar Fjord, Swedish west coast |
| VerfasserIn |
I. Polovodova Asteman, K. Nordberg, H. L. Filipsson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 3 ; Nr. 10, no. 3 (2013-03-01), S.1275-1290 |
| Datensatznummer |
250018123
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| Publikation (Nr.) |
 copernicus.org/bg-10-1275-2013.pdf |
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| Zusammenfassung |
| We discuss the climatic and environmental changes during the last millennium
in NE Europe based on a ca. 8-m long high-resolved and well-dated marine
sediment record from the deepest basin of Gullmar Fjord (SW Sweden).
According to the 210Pb- and 14C-datings, the record includes the
period of the late Holocene characterised by anomalously cold summers and
well-known as the Little Ice Age (LIA). Using benthic foraminiferal
stratigraphy, lithology, bulk sediment geochemistry and stable carbon
isotopes we reconstruct various phases of the cold period, identify its
timing in the study area and discuss the land–sea interactions occurring
during that time. The onset of the LIA is indicated by an increase in
cold-water foraminiferal species Adercotryma glomerata at
~ 1350 AD The first phase of the LIA was characterised by a stormy
climate and higher productivity, which is indicated by a foraminiferal unit
of Nonionella iridea and Cassidulina laevigata. Maximum
abundances of N. iridea probably mirror a short and abrupt warming
event at ~ 1600 AD. It is likely that due to land use changes in the
second part of the LIA there was an increased input of terrestrial organic
matter to the fjord, which is indicated by lighter δ13C values and
an increase of detritivorous and omnivorous species such as
Textularia earlandi and Eggerelloides scaber. The climate
deterioration during the climax of the LIA (1675–1704 AD), as suggested by
the increase of agglutinated species, presence of Hyalinea balthica,
and a decline of N. iridea may have driven the decline in primary
productivity during this time period. |
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