Abstract:
The dataset comprises of analyses of two sediment cores (LC12 and LC7), extracted from Blaso, a large epishelf lake on the margin of 79 degrees N Ice Shelf, NW Greenland in July-August 2017. The data are used to constrain ice shelf dynamics over the last 8500 calibrated years before present (cal. years B.P., where present is A.D. 1950). Data for the LC7 and LC12 sediment records consist of radiocarbon (14C) chronology data.
Overlapping 2 m-long sediment cores were recovered with a UWITEC KOL 'Kolbenlot percussion piston corer to a total sediment depth of 3.74 m (LC7) and 5.24 m (LC12). Accelerator mass spectrometry (AMS) was used for radiocarbon (14C) dating.
Core LC7: 87 m water depth; 79.589 degrees N, 22.494 degrees E.
Core LC12: 90 m water depth; 79.5948 degrees N, 22.44233 degrees E.
This project was funded by the Natural Environment Research Council (NERC) through Standard Grant NE/N011228/1. We thank the Alfred Wegner Institute, and particularly Angelika Humbert and Hicham Rafiq, for their significant logistic support through the iGRIFF project. Additional support was provided from Station Nord (Jorgen Skafte), Nordland Air, Air Greenland and the Joint Arctic Command. Naalakkersuisut, Government of Greenland, provided Scientific Survey (VU-00121) and Export (046/2017) licences for this work
Keywords:
Greenland, Holocene, epishelf lake, ice shelf history, palaeolimnology
shortdoi:10/jqm6
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | Data released under Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2022-09-08 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | PDC BAS |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Louise Callard |
| Role(s) | Investigator |
| Organisation | Newcastle University |
| Name | Dr James Smith |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Maria L Sanchez-Montes |
| Role(s) | Investigator |
| Organisation | University of Colorado Boulder |
| Name | Prof Erin L McClymont |
| Role(s) | Investigator |
| Organisation | Durham University |
| Name | Prof Jeremy M Lloyd |
| Role(s) | Investigator |
| Organisation | Durham University |
| Name | Prof Werner Ehrmann |
| Role(s) | Investigator |
| Organisation | University of Leipzig |
| Name | Prof David Roberts |
| Role(s) | Investigator |
| Organisation | Durham University |
| Name | Prof Michael J Bentley |
| Role(s) | Investigator |
| Organisation | Durham University |
| Name | Prof Stewart S R Jamieson |
| Role(s) | Investigator |
| Organisation | Durham University |
| Name | Dr Timothy P Lane |
| Role(s) | Investigator |
| Organisation | Liverpool John Moores University |
| Name | Dr Christopher M Darvill |
| Role(s) | Investigator |
| Organisation | University of Manchester |
| Parent Dataset: | N/A |
| Reference: | Associated paper: Smith, James & Callard, S. Louise & Bentley, Michael & Jamieson, Stewart & Sánchez Montes, Maria Luisa & Lane, Timothy & Lloyd, Jeremy & McClymont, Erin & Darvill, Christopher & Rea, Brice & O'Cofaigh, Colm & Gulliver, Pauline & Ehrmann, Werner & Jones, Richard & Roberts, Dave. (2023). Holocene history of the 79° N ice shelf reconstructed from epishelf lake and uplifted glaciomarine sediments. The Cryosphere. 17. 1247-1270. 10.5194/tc-17-1247-2023. Methodology references: Heaton, T. J., Kohler, P., Butzin, M., Bard, E., Reimer, R. W., Austin, W. E. N., Bronk Ramsey, C., Grootes, P. M., Hughen, K. A., Kromer, B., Reimer, P. J., Adkins, J., Burke, A., Cook, M. S., Olsen, J., and Skinner, L. C.: Marine20- The Marine Radiocarbon Age Calibration Curve (0-55,000 cal BP), Radiocarbon, 62, 779-820, 10.1017/RDC.2020.68, 2020. Morner, N.-A. and Funder, S.: C-14 dating of samples collected during the NORQUA 86expedition, and notes on the marine reservoir effect, Meddelelser om Gronland, 22, 57-89, 1990. Reimer, P. J., Bard, E., Bayliss, A., Beck, J. W., Blackwell, P. G., Ramsey, C. B., Buck, C. E., Cheng, H., Edwards, R. L., Friedrich, M., Grootes, P. M., Guilderson, T. P., Haflidason, H., Hajdas, I., Hatte, C., Heaton, T. J., Hoffmann, D. L., Hogg, 850 A. G., Hughen, K. A., Kaiser, K. F., Kromer, B., Manning, S. W., Niu, M., Reimer, R. W., Richards, D. A., Scott, E. M., Southon, J. R., Staff, R. A., Turney, C. S. M., and van der Plicht, J.: INTCAL13 AND MARINE13 RADIOCARBON AGE CALIBRATION CURVES 0-50,000 YEARS CAL BP, Radiocarbon, 55, 1869-1887, 10.2458/azu_js_rc.55.16947, 2013. Stuiver, M., Reimer, P. J., and Reimer, R. W.: CALIB 8.1 [WWW program] at http://calib.org, 2021. |
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| Lineage: | Overlapping 2 m-long sediment cores were recovered with a UWITEC KOL 'Kolbenlot' percussion piston corer to a total sediment depth of 3.74 m (LC7) and 5.24 m (LC12) in Blaso (LC7: 79°35.340N, 22°29.640E, 87m; LC12: 79°35.688N, 22°26.540E, 90m). The chronology for LC7 and LC12 was established using accelerator mass spectrometry (AMS) radiocarbon (14C) dating. Where possible, calcareous microfossils (mixed benthic foraminifera) were dated, and bulk (acid insoluble organic matter) sediment was only dated in the absence of microfossils. Cores were also inspected for other datable macrofossils (mosses, algae, shells) but were found to be barren. 14C dating of samples from the lake cores, together with macro-fossils (molluscs, gastropods) from the raised marine deposits, was undertaken at the NERC Radiocarbon Laboratory (Environment) in East Kilbride, UK (SUERC-), the Keck-CCAMS, University of California, Irvine, US (UCIAMS-) and Beta Analytic, Miami, US (BETA-). Radiocarbon ages were calibrated to calendar years before present (cal. years BP, where present is A.D. 1950) using the calibration software CALIB 8.1.0 (Stuiver et al., 2021), the Marine13 calibration curve (Reimer et al., 2013), and a marine reservoir of 550 years (delta R = 150) (Morner and Funder, 1990). The Marine20 calibration was not used owing to its unsuitability for sea-ice dominated polar environments (Heaton et al., 2020). |
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| Temporal Coverage: | |
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| Start Date | 2017-07-20 |
| End Date | 2017-08-16 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | 79.589 |
| Northernmost | 79.589 |
| Longitude | |
| Westernmost | 22.494 |
| Easternmost | 22.494 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Greenland |
| Detailed Location | Blaso, NW Greenland |
| Data Collection: | UWITEC KOL 'Kolbenlot' percussion piston corer CALIB 8.1.0 |
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| Data Storage: | 1 csv, 1 txt file 5 KB |
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