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1

Diatom record of northeast Atlantic circulation changes in marine isotope stages 1 and 5

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Witak M., Kuijpers A.
Oceanological Studies
|
2001
|
vol. 30
|
issue 1-2
21-38
EN
Fossil and subfossil diatom floras were analysed in a sediment core taken near the outlet of the Faroe Bank Channel, NE Atlantic. Diatom preservation horizons were found at various levels in the core. The correlation with the oxygen isotope stratigraphy of the core indicates that these horizons correspond to the Marine Oxygen Isotope Sub-Stages 5e (Eemian), 5a and Stage 1 (Holocene). Results of the study show that environmental conditions for the development of diatoms were more favourable in Stage 5 than in the Holocene. At the very beginning of the Sub-Stages 5e and 5a distinct changes in the diatom concentration are indicative of circulation changes probably associated with a marked intensification of the North Atlantic Current. The highest surface water temperature is indicated by the diatom flora from early Sub-Stage 5e.
2

Holocene environmental instability as recorded in a core from the Slupsk furrow, Southern Baltic

100%
Zgrundo A.
Oceanological Studies
|
1999
|
vol. 28
|
issue 3-4
59-73
EN
The aim of the study was to investigate Holocene history as recorded in a single sediment core taken from the Slupsk Furrow, southern Baltic Sea, with the use of diatom analysis. Diatom stratigraphy and abundance of cysts of Chrysophyceae Pascher enabled the changes in salinity and depth of the Baltic during the last 7500 years or so to be followed. Four developmental stages of the Baltic Sea were distinguished on this basis: the decline of the Ancylus Lake (or the Ancylus/Mastogloia transition), the Mastogloia Sea, the Litorina Sea and the Postlitorina Sea.
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