Abstract:
This dataset contains a subset of the ice core data for the ISOL-ICE core recovered from Dronning Maud Land, Antarctica in January 2017 (https://doi.org/10.5285/9c972cfb-0ffa-4144-a943-da6eb82431d2). The subset reported here contains ice core data from the 1455 - 1227 AD period (60.80 - 79.45 m depth) and covers the volcanic eruption of Samalas, Indonesia in 1259. The ice core was dated by annual layer counting and identifying volcanic horizons as fixed time markers. Here we report i) the age-depth model over the 1455 - 1227 AD period, ii) high-resolution nitrate stable isotopic composition of discrete ice core samples, and iii) nitrate, sodium and magnesium mass concentrations and electrolytic meltwater conductivity from continuous flow analysis (CFA).
Funding was provided by the NERC grant NE/N011813/1.
Keywords:
Antarctica, Dronning Maud Land, ISOL-ICE, ice core, nitrate concentration, nitrate isotope
Winton, V., Caillon, N., Hauge, L., Mulvaney, R., Rix, J., Savarino, J., Tuckwell, R., & Frey, M. (2019). Ice core chemistry, conductivity, and stable nitrate isotopic composition of the Samalas eruption in 1259 from the ISOL-ICE ice core, Dronning Maud Land, Antarctica (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/d9a74ea7-2a1a-4068-847e-5bc9f51947c5
| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ |
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| Creation Date: | 2019-07-25 |
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| Dataset Progress: | Planned |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | V. Holly L Winton |
| Role(s) | Investigator, Technical Contact |
| Organisation | British Antarctic Survey |
| Name | Nicolas Caillon |
| Role(s) | Investigator |
| Organisation | Institut des Geosciences de l'Environnement |
| Name | Lisa Hauge |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Robert Mulvaney |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Joel Savarino |
| Role(s) | Investigator |
| Organisation | Institut des Geosciences de l'Environnement |
| Name | Julius Rix |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Rebecca Tuckwell |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Markus Frey |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | GB/NERC/BAS/PDC/01186 |
| Reference: | Frey, M. M., Savarino, J., Morin, S., Erbland, J., and Martins, J.: Photolysis imprint in the nitrate stable isotope signal in snow and atmosphere of East Antarctica and implications for reactive nitrogen cycling, Atmospheric Chemistry and Physics, 9, 8681-8696, 2009. Göktas, F., Fischer, H., Oerter, H., Weller, R., Sommer, S., and Miller, H.: A glacio-chemical characterization of the new EPICA deep-drilling site on Amundsenisen, Dronning Maud Land, Antarctica, Annals of Glaciology, 35, 347-354, 2002. Mariotti, A.: Atmospheric nitrogen is a reliable standard for natural 15N abundance measurements, Nature, 303, 685, 1983. Morin, S., Savarino, J., Frey, M. M., Domine, F., Jacobi, H. W., Kaleschke, L., and Martins, J. M.: Comprehensive isotopic composition of atmospheric nitrate in the Atlantic Ocean boundary layer from 65 S to 79 N, Journal of Geophysical Research: Atmospheres, 114, 2009. Weller, R., and Wagenbach, D.: Year-round chemical aerosol records in continental Antarctica obtained by automatic samplings, Tellus B: Chemical and Physical Meteorology, 59, 755-765, 2007. Weller, R., Wöltjen, J., Piel, C., Resenberg, R., Wagenbach, D., KÖNIG‐LANGLO, G., and Kriews, M.: Seasonal variability of crustal and marine trace elements in the aerosol at Neumayer station, Antarctica, Tellus B, 60, 742-752, 2008. |
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| Quality: | Major ions: At the beginning, end and during the course of the day, a certified reference material (CRM; ERM-CA408 simulated rainwater standards; Sigma-Aldrich) was measured for quality control and yielded an accuracy of 107 %, and precision of 10 % for nitrate. Major elements: At the beginning, end and during the course of the day, a certified reference material (CRM; ERM-CA408 simulated rainwater standards; Sigma-Aldrich) was measured for quality control and yielded an accuracy of 94 and 113 %, and precision of 10 and 13 % for sodium and magnesium. Nitrate stable isotope ratios: Certified reference materials (IAEA USGS-32, USGS-34 and USGS-35; Böhlke et al., 1993; Böhlke et al., 2003) were prepared (matrix match 1 M NaCl solution; ACS grade) and subject to the same analytical procedures as snow and aerosol samples. For each batch of 60 samples, the overall accuracy of the method is estimated as the reduced standard deviation of the residuals from the linear regression between the measured reference materials (n = 16) and their expected values. For the ice core (n = 800), the average uncertainty values obtained for d18O, d17O, D17O and d15N were 2.8 ppth, 2.1 ppth 0.9 ppth and 2.9 ppth respectively. |
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| Lineage: | A full description of the methods for the ISOL-ICE ice core can be found in Winton et al. (2019); doi: 10.5285/9c972cfb-0ffa-4144-a943-da6eb82431d2. Briefly, a new 120 m core was recovered from Kohnen Station, located in Dronning Maud Land (DML) on the high-elevation East Antarctic Plateau (2892 m a.s.l) in January 2017. Sections of the core were analysed for i) continuous flow analysis (CFA) of nitrate, sodium and magnesium mass concentrations and electrolytic meltwater conductivity at the British Antarctic Survey (BAS), Cambridge, and ii) discrete sections for the nitrate stable isotopic composition at the Environmental Geosciences (IGE), University of Grenoble-Alpes. Here we report the dated section of the ice core from 1455 - 1227 AD (60.80 - 79.45 m) covering the largest volcanic eruption, Samalas in 1259, over the past 1000-years. Dating was achieved by annual layer counting of measured concentrations of sodium and magnesium following previous studies at DML (Göktas et al., 2002; Weller and Wagenbach, 2007; Weller et al., 2008) constrained by well-dated volcanic eruption horizons. An age uncertainty of +/- 3 years is estimated at the base of the ice core. High-resolution sampling for nitrate isotopic analysis was carried out i) across volcanic horizons with a sample resolution of 5 - 30 cm, and ii) in 10 cm resolution baseline samples 1 m either side of the volcanic peak. A total of 119 discrete measurements of d15N-NO3- are reported here. Discrete nitrate isotope samples were pre-concentrated and analysed using the denitrifier method following Frey et al. (2009);Morin et al. (2009). The nitrogen isotopic ratio was referenced against N2-Air (Mariotti, 1983). We report 15N/14N of NO3- (d15N-NO3-) as d-values following d = (Rsample /Rstandard - 1) * 1000 where R is the elemental isotopic ratio in the sample and standard respectively. The overall accuracy of the method for d15N is 2.9 ppth. | |
| Temporal Coverage: | |
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| Start Date | 1227-01-01 |
| End Date | 1455-12-31 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -74.9961 |
| Northernmost | -74.9961 |
| Longitude | |
| Westernmost | .09472 |
| Easternmost | .09472 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Data Resolution: | |
| Latitude Resolution | N/A |
| Longitude Resolution | N/A |
| Horizontal Resolution Range | < 1 meter |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Kohnen Station, Dronning Maud Land |
| Sensor(s): |
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| Data Collection: | Fast ion chromatography: ICS-3000, Dionex™ with a AS15-5um and AERS500-4mm suppressor. Isotope ratio mass spectrometer (IRMS) for duel O and N analysis: Thermo Finnigan™ MAT 253 IRMS equipped with a GasBench II™ and coupled to an in-house-built NO3- interface. Inductively coupled plasma-mass spectrometry: 7700 series, Agilent. Conductivity: Dionex? conductivity detector. |
| Data Storage: | 3 x CSV files totalling 2.3 MB |
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