Diatoms and aquatic palynomorphs in the sediments of the Eurasian Arctic seas and their significance for paleooceanological investigations in the Arctic

Polyakova, Ye. I.; Novichkova, Yekaterina I.; Klyuvitkina, T. S.; Агафонова, Е. А.; Kryukova, I.

doi:10.33624/2311-0147-2019-2(20)-246-251

Cited by 2 publications

(1 citation statement)

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“…The main driver of interannual variability in SST is the variability of the Atlantic water temperature, which has increased significantly since 2005 [59]. Therefore, a special task was to find out whether the sinking material of the Eastern Barents Sea contains species of diatoms and dinoflagellate cysts, such as Coscinodiscus radiatus, C. perforatus, Shionodiscus oestrupii [25,60,61] and Operculodinium centrocarpum [62,63], which are indicators of the advection of transformed Atlantic waters into the Arctic seas.…”

Section: Introductionmentioning

confidence: 99%

Diatom and Dinocyst Production, Composition and Flux from the Annual Cycle Sediment Trap Study in the Barents Sea

et al. 2022

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This paper presents the diatom and palynomorph data from a sediment trap deployed in the northern part of the East Barents Sea for an annual cycle from August 2017 to August 2018. The average monthly fluxes of diatoms and dinoflagellate cysts in the photic layer of the northeastern part of the Barents Sea varies from 10.4 × 103 to 640.8 × 103 valves m−2 day−1 and from 0.3 × 103 to 90.0 × 103 cysts m−2 day−1, respectively. Their fluxes are related to the low irradiance of the photic layer during the sea-ice cover period, dominance of southward currents, modern climate, and nepheloid layer conditions. Based on redundancy analysis of the relationship between the fluxes of diatoms and dinoflagellate cysts and organic carbon fluxes, sea-ice covers, and the seasonal cycle of light availability we determined the following. First, sea-ice-associated diatoms and dinocysts are exported to the sediment trap from the melting sea ice with a two-week delay. Second, the appearance of freshwater diatoms and green algae in the sinking material accumulating from March 2018 to July 2018 is also related to the melting of sea ice. And third, the presence of Coscinodiscus radiatus, C. perforatus, Shionodiscus oestrupii and Operculodinium centrocarpum in the diatoms and dinocysts species composition throughout the year indicates the advection of Atlantic waters into the Barents Sea up to 80° N.

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