http://bolin.su.se/data/cascade-sediment-cores-2 Jannik Martens, Evgeny Romankevich, Igor Semiletov, Birgit Wild, Bart van Dongen, Jorien Vonk, Tommaso Tesi, Natalia Shakhova, Oleg V. Dudarev, Denis Kosmach, Alexander Vetrov, Leopold Lobkovsky, Nikolay Belyaev, Robie Macdonald, Anna J. Pieńkowski, Timothy I. Eglinton, Negar Haghipour, Salve Dahle, Michael L. Carroll, Emmelie K.L. Åström, Jacqueline M. Grebmeier, Lee W. Cooper, Göran Possnert, Örjan Gustafsson Bolin Centre Database 2021 Datafile Marine Arctic carbon CASCADE Sediment Carbon Arctic Biogeochemical cycles Climate change Earth science > Oceans > Ocean chemistry > Biogeochemical cycles Örjan Gustafsson 2021-04-09T13:07:56+00:00 English 2 ##### Depositional time scales Sediment cores are distinguished by three depositional time scales as follows: 1. Centennial scale cores (core scale 1) in upper sediments of the Arctic Ocean, e.g., multi corer, Gemini corer, box corer, van Veen grab sampler, other short gravity corers up to 1 m length. 2. Millennial scale cores (core scale 2) of shelf sediments roughly covering the depositional time frame from the late Holocene to the last glacial/interglacial transition, by e.g., piston corer, long gravity corer, kasten corer. 3. Glacial cycles scale cores (core scale 3) from the continental slopes or the deeper Arctic Ocean basins covering periods from earlier than the Last Glacial Maximum, including e.g. drill coring on the Circum-Arctic shelves or deep-sea piston cores. ##### Data sheets for sediment cores Three depositional time scales are distinguished for the dataset of sediment cores (see criteria above), which are organized as three different data tables. We, however, also provide one summary table with all core scales represented in one file. Each core scale is available as Excel spreadsheet (.xslx) and as tab-separated text (.txt) file: - CASCADEcorescale1_v2.xlsx - CASCADEcorescale1_v2.txt - CASCADEcorescale2_v2.xlsx - CASCADEcorescale2_v2.txt - CASCADEcorescale3_v2.xlsx - CASCADEcorescale3_v2.txt - CASCADEcores_v2.xlsx - CASCADEcores_v2.txt ##### Data sheet structure As for surface sediments, all data and meta data for each core subsample and measurement are organized as columns in each data table. Each row in the CASCADE data sheets for sediment cores represents one subsample from a sediment core at an oceanographic station that was analyzed for one or several carbon parameters. The data sheet for sediment cores also includes a column for the sampling depth of core subsamples in cm below the sediment surface. Hence, multiple subsamples from one core are organized as multiple subsamples in the data sheet, which share the same geospatial information (lat, lon) but represent different sampling depth. ###### Columns for ID, depth and georeference 1. CASCADE entry ID 2. Sample code (as reported by data source) 3. Latitude (decimal degrees) 4. Longitude (decimal degrees) 5. Mean sample depth below sea floor (cm) 6. Water depth (m b.s.l.) 7. Expedition or vessel name 8. Sampling year ###### Carbon and Nitrogen (CN) data 9. OC (%) 10. TN (%) 11. OC/TN ###### Carbon isotopes 12. δ¹³C (‰ VPDB) 13. Δ¹⁴C (‰) ###### References 14. Citation of CN data 15. Citation of δ¹³C data 16. Citation of Δ¹⁴C data ###### Quality parameter and meta information 17. Sediment sampler (e.g. grab sampler, multi corer, etc) 18. Sample storage (0 for unknown, 1 for frozen, 2 for refrigerated) 19. CN measurement (method of analysis) 20. ¹³C measurement (method of analysis) 21. AMS label Please cite the companion paper in ESSD and the database when using the CASCADE. The CASCADE is guided and continuously curated by scientists at the Bolin Centre for Climate Change - [Örjan Gustafsson](https://www.aces.su.se/staff/orjan-gustafsson/) - [Jannik Martens](https://www.aces.su.se/staff/jannik-martens/) - [Matthias Brakebusch](https://www.aces.su.se/staff/matthias-brakebusch/) #### Version history ##### Version 2 Minor corrections and improvements of the dataset based on reviewer comments. ##### Version 1 Initial release.