Siliceous microfossil data from Gamlebyviken, Swedish east coast, for the last 3000 years

Elinor Andrén, Thomas Andrén

This dataset consists of siliceous microfossil counts (mainly diatoms) and concentrations (absolute abundance), from a 494 cm long splice sediment record (core EL18-SH01-03) from the Gamlebyviken estuary, Swedish east coast (Baltic Sea).

The sediment was collected in August 2018 at a water depth of 55 m and covers approximately 3000 years.

Changes in diatom assemblages are used as a proxy to reconstruct environmental conditions and climate change over time. Concentration data is primarily used as a proxy for paleoproductivity.

Citation

Elinor Andrén, Thomas Andrén (2024) Siliceous microfossil data from Gamlebyviken, Swedish east coast, for the last 3000 years. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/andren-2024-gamlebyviken-microfossil-1

References

Andrén, E, Vinogradova, O, Lönn, M, Belle, S, Dahl, M, Palm, V, Katrantsiotis, C, Nielsen, AB, Jakobsson, M, Rönnby, J, Andrén, T (2024) Modern land use changes drive shifts in nutrient cycling and diatom assemblages in the Baltic Sea coastal zone: A millennial perspective with a case study from Gamlebyviken, Swedish east coast. Quaternary Science Reviews 346, 109058. https://doi.org/10.1016/j.quascirev.2024.109058

Data description

The dataset contains diatom species data (counts) and siliceous microfossil absolute abundance (concentration) data from 60 stratigraphical levels covering 2018⁠ CE – ⁠3091 cal yr BP from a 480 cm long splice sediment record (core EL18-SH01-03). An age model was constructed using radiocarbon dates, lead-210 and cesium-137. Both sediment depth (cm below sea floor) and ages (cal yr BP) are provided.

The name of the core EL18-SH01-03 combines a reference to the research vessel (Electra av Askö), the sampling year (2018), the expedition (sampling expedition 1 from Södertörn University) and the site (site 3).

The data is provided as an .xlsx file containing two sheets, containing diatom species counts as well as aggregated concentation and accumulation data. These sheets are also provided as individual .tsv files. The sheets and corresponding .tsv files contain the following data:

1. Diatom species counts. Columns:

   1. Sample: identifier of the sample in question
   2. Depth below sea floor: spliced record of depth in cm, where 0 = surface
   3. Age: calibrated age in years BP
   4. Concentration diatoms: number of valves per gram of dry-weight sediment
   5. Total counts: diatom counts in number of valves
   6. to 325: Diatom counts in number of valves per species

2. Concentrations and accumulations. Columns:

   1. Sample: identifier of the sample in question
   2. Depth below sea floor: depth in cm, where 0 = surface
   3. Age: calibrated age in years BP
   4. Concentration diatoms: number of valves per gram of dry-weight sediment
   5. Concentration Chrysophyte cysts: number of valves per gram of dry-weight sediment
   6. Concentration Ebria tripartita: number of valves per gram of dry-weight sediment
   7. Diatom accumulation rate: number of valves per square meter and year
   8. Chrysophyte accumulation rate: number of cysts per square meter and year
   9. Ebria tripartita accumulation rate: number of skeletons per square meter and year

Comments

Coordinates of the sampling site: 57° 51.690’ N, 16° 26.913’ E