5 July 2018

Sea-surface temperature reconstructions over Dansgaard Oeschger (DO) events 5-8 (30-40 ka)

Jensen et al. have establish a spatio-temporal evolution of the sea-surface temperature anomalies in the North Atlantic over Dansgaard Oeschger (DO) events 5-8 using the proxy surrogate reconstruction method. Also, they have calculated new sea-surface temperature estimates over Dansgaard-Oeschger (DO) events 5-8 from 14 sites in the North Atlantic (see Figure), based on previously published planktic foraminifera relative abundance datasets. 

The datasets can be downloaded here.
Their paper is available here.

Core locations of the proxy data.





Foraminifer, diatom frustules, and total organic carbon of sediment cores in the Norwegian Trench and the Skagerrak

The reconstruction of the late Holocene palaeoproductivity changes in the Skagerrak and the Norwegian Trench provides data of multiple proxies: benthic foraminifera, planktonic foraminifera, diatoms and total organic carbon (TOC) analyzed in 3 sediment cores: EMB046/6-5GC, EMB046/10-4GC and EMB046/20-3GC.

The data are given as nine files: 3 separate files (foraminifera, diatom and TOC) for each of the cores. The datasets can be found here.

Benthic foraminiferal data are presented as relative abundances (%) of Brizallina skagerrakensis and absolute abundances of palaeoproductivity species, low oxygen species, agglutinated taxa and total benthic foraminifera. Palaeoproductivity species include: Alabaminella weddelensis, Brizalina skagerrakensis, Bulimina marginata, Epistominella exigua, Epistominella vitrea, Nonionella iridea, Uvigerina mediterrannea and Uvigerina peregrina. Low oxygen species are grouped by summing together species Adercotryma glomerata, Ammodiscus spp., Bolivina spp., Buccella frigida, Globobulimina auriculata, Globobulimina turgida, Planulina ariminensis, Textularia earlandi, Spiroplectammina biformis and Stainforthia fusiformis.

Planktonic foraminifera and diatoms are given in absolute abundances per g sediment, whilst TOC data are in %.

The dataset has been originally published in:
Polovodova Asteman, I., Risebrobakken, B., Moros, M., Binczewska, A., Dobosz, S., Jansen, E., Sławińska, J., & Bąk, M.: Late Holocene palaeoproductivity changes: a multi-proxy study in the Norwegian Trench and the Skagerrak, North Sea. Boreas, doi:10.1111/bor.12264.

This paper should be cited whenever the data are used.


Proxy data from the sediment cores EMB046/20-3GC; 10-4GC and 6-5GC: benthic foraminifer B. skagerrakensis (%), total organic carbon (TOC) and absolute abundances per gram wet sediment for diatoms, benthic foraminifera indicative of palaeoproductivity, planktonic foraminifera, benthic foraminifera representative for low oxygen conditions, total benthic foraminifera and agglutinated foraminifera. Note different y scale and low diatom abundances due to low silica preservation for the data from the western Norwegian margin. Shaded grey rectangle shows a low productivity period at 4500–2300 years BP, while green rectangle depicts a high productivity period from ~1700 years BP towards present day.


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