Ionic composition of particulate matter (PM10) from high-volume sampling over the Southern Ocean during the austral summer of 2016/2017 on board the Antarctic Circumnavigation Expedition (ACE).

***** Dataset abstract *****

Aerosol particles originate from a variety of sources (Tomasi and Lupi, 2017). Information on particle chemical composition can be utilized to access particle origin. During the Antarctic Circumnavigation Expedition (ACE) cruise around the Southern Ocean, off-line filter sampling of ambient air was performed. Filters were stored on the ship (at -20 degrees C) and after the cruise concluded analysed at Leibniz-Institute for Tropospheric Research (TROPOS) concerning ionic composition of sampled material. Here, we give mass concentrations for inorganic ions (chloride, sodium, potassium, magnesium, calcium, ammonium, nitrate, sulphate, and bromide), organic constituents (methane-sulfonic acid and oxalate), and total filter load of particles with a mobility diameter smaller 10 micrometers (PM10) for each 24 hour-sampled filter.

***** Original data collection *****

A DIGITEL sampler with automatic filter exchange (type DHA-80 by Walter Riemer Messtechnik, Germany) was operated on the deck above the bridge of the R/V Akademik Tryoshnikov during ACE. On a PM10-inlet, the instrument was run at a flow rate of approximately 500 liters per minute. Quartz-fibre filters (14 centimeters in diameter) were used for collection, sampled for 24 hours each. Additionally, extra filters were handled during the cruise without being sampled, used later as field blank filters to access background concentrations. An ultrasonic anemometer was operated in conjunction with the filter sampler, providing additional data on wind speed and direction. Here, real-time information on wind direction was used to use an automatic shut-down mechanism, stopping sampling whenever wind came from within a 180-degree sector around the sampler, with the stack of the vessel at a 90-degree position.

Sampled filters were stored at -20 degrees C during the cruise and brought back deep-frozen to TROPOS, for further analysis, e.g. concerning ionic composition. Ion chromatographic (IC) analysis of the filters was performed at the atmospheric chemistry department (ACD) of TROPOS. A procedure similar to Müller et al. (2010) and Van Pinxteren et al. (2017) was used to extract filter contents and perform ion chromatography using an ICS3000 instrument (by Dionex, Sunnyvale, CA, USA). It was calibrated before and after each measurement cycle using external standards. Furthermore, ionic analysis are routinely included in external inter-laboratory comparison to ensure quality control.

The output of the ion chromatograph was stored digitally as a data table (ASCII format). 

***** Data processing *****

Analogue to sampled filters, ion chromatography was performed on field blank filters and for each ion the mass concentration was averaged. For each sampled filter, respective field blank average mass concentration per ion was subtracted.

The ion chromatograph’s output was processed using the “Chromeleon” software (Thermo Fisher Scientific, version 7.2) and Microsoft Excel 2010 on a Windows 7 operating system. Further, Microsoft Excel 2019 on a Windows 10 operating system was used to compile a data table. The data table was finalised using an interactive Python (version 2.7) with Ipython (version 5.4.1) on a Ubuntu operating system (version 16.04).

***** Quality checking *****

A quality flag (QF) was derived, indicating bad data (QF=0) for cases where volume of sampled air was lower than 100 m^3. Here,volume of sampled air produces unreasonable concentrations when compared to concentrations derived from field blank filters.

***** Standards *****
 
Wherever possible, these parameter names conform to the CF standard names (version 72) https://cfconventions.org/Data/cf-standard-names/72/build/cf-standard-name-table.html

***** Further information for interpreting the data and using the dataset *****

Interpolation: As sampling is performed for 24 hours, interpolation to any finer resolution should be avoided.

***** Dataset contents *****

- ACESPACE_particulate_matter_pm10_ionic_composition_highvolume.csv, data file, comma-separated values
- data_file_header.txt, metadata, text
- README.txt, metadata, text

***** Dataset contact *****

Christian Tatzelt, Leibniz Institute for Tropospheric Research (TROPOS), Germany. ORCID: 0000-0001-7795-5372. Email: christian.tatzelt@tropos.de
Silvia Henning, Leibniz Institute for Tropospheric Research (TROPOS), Germany. ORCID: 0000-0001-9267-7825. Email: silvia.henning@tropos.de
Manuela Van Pinxteren, Leibniz Institute for Tropospheric Research (TROPOS), Germany. ORCID: 0000-0002-8746-8620. Email: manuela.vanpinxteren@tropos.de

***** Dataset license *****

This ionic composition of particulate matter (PM10) from high-volume sampling dataset during ACE is made available under the Creative Commons Attribution 4.0 International License (CC BY 4.0) whose full text can be found at https://creativecommons.org/licenses/by/4.0/ 

***** Dataset citation *****

Please cite this dataset as:
Tatzelt, C., Henning, S., Tummon, F., Hartmann, M., Baccarini, A., Welti, A., Lehtipalo, K., Schmale, J. and Van Pinxteren, M. (2020). Ionic composition of particulate matter (PM10) from high-volume sampling over the Southern Ocean during the austral summer of 2016/2017 on board the Antarctic Circumnavigation Expedition (ACE). (Version 1.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.3922147