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Kjær, Helle Astrid; Zens, Patrick; Black, Samuel; Lund, Kasper Holst; Svensson, Anders M; Vallelonga, Paul T (2023): Insoluble dust, ammonium, calcium, conductivity, peroxide and acid measured in firn cores in Northern Greenland in 2015: T2015-A6 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.957622, In: Kjær, HA et al. (2023): Insoluble dust, ammonium, calcium, conductivity, peroxide and acid measured in firn cores in Northern Greenland in 2015 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.952936

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Abstract:
Results from six firn cores obtained during a 426 km long northern Greenland traverse in 2015 between the NEEM and the EGRIP deep drilling stations situated on the Western and Eastern side of the Greenland ice sheet, respectively. The cores (9 to 14 m long) are analysed for chemical impurities by means of Continuous Flow Analysis (CFA); Insoluble dust, ammonium, calcium, acid, conductivity and peroxide. The data was dated by means of annual layer counting of mainly peroxide supplemented by calcium seasonal cycles and spans 18 to 53 years (±3 yrs) depending on local snow accumulation that decreases from west to east. Insoluble dust, ammonium, and calcium concentrations in the 6 firn cores overlap, and also the seasonal cycles are similar in timing and magnitude across sites, while peroxide (H2O2) and conductivity both have spatial variations. H2O2 is driven by the accumulation pattern and conductivity is likely influenced by sea salt. Data is published as part of Kjær et al. 2022, Climate of the past, https://doi.org/10.5194/cp-2021-99
Keyword(s):
acidity; ammonium; calcium; Conductivity; dust; firn; Firn chemistry; Greenland; peroxide
Related to:
Kjær, Helle Astrid; Zens, Patrick; Black, Samuel; Lund, Kasper Holst; Svensson, Anders M; Vallelonga, Paul T (2022): Canadian forest fires, Icelandic volcanoes and increased local dust observed in six shallow Greenland firn cores. Climate of the Past, 18(10), 2211-2230, https://doi.org/10.5194/cp-2021-99
Documentation:
Bigler, Matthias; Svensson, Anders M; Kettner, E; Vallelonga, Paul T; Nielsen, Maibritt; Steffensen, Jørgen Peder (2011): Optimization of High-Resolution Continuous Flow Analysis for Transient Climate Signals in Ice Cores. Environmental Science & Technology, 45(10), 4483-4489, https://doi.org/10.1021/es200118j
Funding:
Agence Nationale de la Recherche (ANR), grant/award no. 07-VULN-09-001: North Greenland Eemian Ice Drilling
European Research Council (ERC), grant/award no. 610055: Arctic Sea Ice and Greenland Ice Sheet Sensitivity
Horizon 2020 (H2020), grant/award no. 820970: Tipping Points in the Earth System
Coverage:
Latitude: 76.102940 * Longitude: -41.056280
Date/Time Start: 2015-05-24T00:00:00 * Date/Time End: 2015-05-24T00:00:00
Minimum DEPTH, ice/snow: 0.000 m * Maximum DEPTH, ice/snow: 12.026 m
Event(s):
T2015-A6 * Latitude: 76.102940 * Longitude: -41.056280 * Date/Time: 2015-05-24T00:00:00 * Elevation: 2760.0 m * Method/Device: Snow pits/firn core/ice core
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, ice/snowDepth ice/snowmKjær, Helle AstridContinuous flow analysis according to Bigler (2011)Geocode
2AGEAgeka BPKjær, Helle AstridAnnual layer countingGeocode
3AgeAgea AD/CEKjær, Helle AstridAnnual layer countingagescale based primarily on summer max of H2O2 and calcium seasonal cycles
4Hydrogen peroxideH2O2arbitrary unitsKjær, Helle AstridFluorometer, FIAlab Instruments, PMT-FLppm, as described in Bigler et al, 2011
5Conductivity, electricalCond electrµS/cmKjær, Helle AstridConductivity Meter, Amber Science, 3082 [with micro flow cell 829]
6DustDust#/mlKjær, Helle AstridLaser particle counter, Klotz, Abakus [LDS 23/25bs sensor]Insoluble dust (counts > 1µm/ml) as described in Bigler et al, 2011
7CalciumCa2+µg/lKjær, Helle AstridFluorometer, FIAlab Instruments, PMT-FLppb, as described in Bigler et al, 2011
8Ammonium[NH4]+µg/lKjær, Helle AstridFluorometer, FIAlab Instruments, PMT-FLppb, as described in Bigler et al, 2011
9Hydrogen ion + indicator[H+] +indµmol/lKjær, Helle AstridOptical dye according to Kjær et al. (2016)Hydrogen ion + dye
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
84789 data points

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