High-resolution aerosol concentration data from the Greenland NorthGRIP and NEEM deep ice cores

Erhardt, Tobias; Bigler, Matthias; Federer, Urs; Gfeller, Gideon; Leuenberger, Daiana; Stowasser, Olivia; Röthlisberger, Regine; Schüpbach, Simon; Ruth, Urs; Twarloh, Birthe; Wegner, Anna; Goto-Azuma, Kumiko; Kuramoto, Takayuki; Kjær, Helle A.; Vallelonga, Paul T.; Siggaard-Andersen, Marie-Louise; Hansson, Margareta E.; Benton, Ailsa K.; Fleet, Louise G.; Mulvaney, Rob; ... (2022). High-resolution aerosol concentration data from the Greenland NorthGRIP and NEEM deep ice cores. Earth System Science Data, 14(3), pp. 1215-1231. Copernicus Publications 10.5194/essd-14-1215-2022

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Records of chemical impurities from ice cores enable us to reconstruct the past deposition of aerosols onto polar ice sheets and alpine glaciers. Through this they allow us to gain insight into changes of the source, transport and deposition processes that ultimately determine the deposition flux at the coring location. However, the low concentrations of the aerosol species in the ice and the resulting high risk of contamination pose a formidable analytical challenge, especially if long, continuous and highly resolved records are needed. Continuous flow analysis, CFA, the continuous melting, decontamination and analysis of ice-core samples has mostly overcome this issue and has quickly become the de facto standard to obtain high-resolution aerosol records from ice cores after its inception at the University of Bern in the mid-1990s.
Here, we present continuous records of calcium (Ca2+), sodium (Na+), ammonium (NH4+), nitrate (NO3−) and electrolytic conductivity at 1 mm depth resolution from the NGRIP (North Greenland Ice Core Project) and NEEM (North Greenland Eemian Ice Drilling) ice cores produced by the Bern Continuous Flow Analysis group in the years 2000 to 2011 (Erhardt et al., 2021). Both of the records were previously used in a number of studies but were never published in full 1 mm resolution. Alongside the 1 mm datasets we provide decadal averages, a detailed description of the methods, relevant references, an assessment of the quality of the data and its usable resolution. Along the way we will also give some historical context on the development of the Bern CFA system.
The data is available in full 1 mm and 10-year-averaged resolution on PANGAEA (https://doi.org/10.1594/PANGAEA.935838, Erhardt et al., 2021).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Erhardt, Tobias, Stocker, Thomas, Fischer, Hubertus

Subjects:

500 Science > 530 Physics

ISSN:

1866-3516

Publisher:

Copernicus Publications

Funders:

[4] Swiss National Science Foundation ; [31] Oeschger Centre for Climate Change Research (OCCR)

Projects:

[UNSPECIFIED] SNF projects 172506, 137635, 147174, 105523, 119612, 159563, 57053, 63333

Language:

English

Submitter:

Hubertus Fischer

Date Deposited:

21 Mar 2022 10:21

Last Modified:

19 Jan 2024 04:34

Publisher DOI:

10.5194/essd-14-1215-2022

BORIS DOI:

10.48350/167498

URI:

https://boris.unibe.ch/id/eprint/167498

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