1. Four open datasets of atmospheric ion and aerosol measurements Hannes.Tammet@ut.ee with acknowledgements to colleagues providing the data for open access datasets

2. The DataCite global consortium (https://www.datacite.org) supports archiving of research data and helps to assign to datasets digital object identifiers (DOI). This opportunity is used uploading datasets of atmospheric ion and aerosol measurements to a safe repository and making the data accessible for everybody.

3. ATMEL2007A ► http://dx.doi.org/10.15155/repo-1 FinEstIon2003_06 ► http://dx.doi.org/10.15155/repo-4 Hyytiala08_10aerosol ► http://dx.doi.org/10.15155/repo-3 Nanoion2010_11 ► http://dx.doi.org/10.15155/repo-2 Today only small part of information available in these datasets is utilized in the aerosol research.

4. 1. ATMEL2007A Preliminary version was presented in Pikajärve workshop 2005. Publication: Tammet, H. (2009). A joint dataset of fair-weather atmospheric electricity. Atmos. Res., 91, 194–200. The amount of included hourly average values is about 12,000,000. A focus for aerosol research is the subset of measurements from 1 August 1972 to 31 December 1983 on Wank Peak, a.s.l. 1780 m. The measurements were arranged by the Director of the Fraunhofer Institute of Atmospheric Environment at Garmisch-Partenkirchen Dr. Reinhold Reiter. Wank data include hourly averages of CN concentrations routinely recorded using General Electric CNC (designed by T.A. Rich) equipped with automatically commutable diffusion battery. CN concentration was recorded: 1 without diffusion battery, 2 with electrically neutral diffusion battery, and 3 with charged diffusion battery. Other recorded quantities are concentrations of air ions, concentration of NO x, UV-radiation and total radiation, etc.

6. 2007 July

8. ATMEL2007A tablemaker DataCite version of ATMEL2007A includes a new tool: the Tablemaker. It allows extract Excel tables much easier than the universal tool called the DataDiurna data manager. Additionally, all data are presented simultaneously as a DataDiurna diary and as seven large Excel tables. EXAMPLE: 1. Prepare description of the table as a text file table_description.txt ------------------------------------- 1: Wank_78_83.xls 2: 1978010119831231 3: -999 CNR1:cm-3@Wank CNR2:cm-3@Wank NOX:ug/m3@Wank Rad:W/m2@Wank UV:mW/m2@Wank 2. Drag table_description.txt onto the icon of ATMEL2007tablemaker.exe

9. HourCNR1CNR2NOXRadUV 69557001.100 79456951.100 89607051.100.12 910607451.2420.79 1010607551.11512.38 1113108901.12363.85 12182510651.22524.18 13206510750.92373.54 1420509950.71962.24 1518308550.81130.9 1614256850.9290.16 1710905500.900 An excerpt from the result:

10. Calculate: CN-coarse = CNR2 CN-fine = CNR1 – CNR2 UV/Rad = 1000 * UV / Rad

11. 2. FinEstIon2003_06 Contains air ion mobility and fine nanoparticle size distribution measurements in Hyytiälä, Tahkuse. Preliminary version of the dataset was presented in Pühajärve workshop 2007. For DataCite repository the dataset was converted into a large Excel table Finestion.xls and accompanied witha new tool Finestractor.exe (why?) Finestion.xls is a text file, where every data line presents measurements for a 10-minute period. All possible periods are saved without any omission for all 4 years. The number of hours during four years is (365 + 366 + 355 + 355) × 24 = 35064 and number of 10-minute periods is 210384. Thus the file consist 210385 text lines, where the first line is the header. Every line contains 273 tab-delimited words. The words of the header are the brief names of variables and the words of following lines are values of the variables.

12. FinEstIon2003_06 In addition to the numerical table, the dataset contains a subset of diagrams for measurements in Tartu. Excerpt from the index:

13. A diagram:

14. 3. Hyytiala08_10aerosol Introduced in the paper Tammet, H., Kulmala, M. (2014). Empiric equations of coagulation sink of fine nanoparticles on background aerosol optimized for boreal zone. Boreal Environ. Res., 19, 115–126. Contains results of routine measurements during 3 years of 2008–2010. The particle size range from 3 nm to 15μm is split into 60 fractions and the records of distribution function are presented for 21682 hours of measurements. The dataset includes three files: Data_Hyytiala08_10aerosol.xls – a table, which contains 60 columns of the particle size distribution and 30 columns of complementary variables. Description_Hyytiala08_10aerosol.pdf – detailed description of origin and structure the data. Additionally includes sample diagrams, which illustrate the data and may provoke new ideas for studies on atmospheric aerosol. Package_Hyytiala08_10aerosol.zip – a compressed package, which contains both the data file and the description file. The package is to be downloaded to a personal computer, unzipped and used offline.

15. Mean size distributions

17. Diurnal variation

18. Weekly variation

19. 4. Nanoion2010_11 Described in the paper Tammet, H., Komsaare, K., Hõrrak, U. (2014). Intermediate ions in the atmosphere. Atmos. Res., 135&136, 263–273. Includes results of a measurement campaign started at 1 April 2010 and finished at 8 November 2011. The instrument SIGMA is described in the paper Tammet, H. (2011). Symmetric inclined grid mobility analyzer for the measurement of charged clusters and fine nanoparticles in atmospheric air. Aerosol Sci. Technol., 45, 468–479. The author acknowledges Kaupo Komsaare for taking care of the instrument, Sander Mirme for presenting the meteorological data, and Urmas Hõrrak for general arrangements and discussions. The high-quality measurements cover 7647 hours, which is about 54% of the full 587 day measurement period.

20. Full period average

22. Includes contour plots for 147 days, which satisfy the requirements:  uninterrupted diurnal set of 288 five-minute records,  no considerable disturbances and low instrumental noise.

23. Noise: excerpt from Hyytiälä SMPS measurements (for comparison) Hour / nm2.93.43.94.55.26.0 1100053611 120003186 13007266252 1400821108 159840074430 1600133530 1700820253 1802157822538 194936293976126 2000738128185 210032396185 22016252336113 23000850142

24. Noise: excerpt from SIGMA measurements (20110318, + ions) Hour / nm 0.490.650.871.161.542.052.743.654.876.50 749374210395661455938394451 84176459466514303232101226050 9439678979680451354296290329232 10389605895579310271278326518715 11401594816493268216242327554772 12430627848470214157154198338553 13438670909496188121112149198279 1446272096049112966485887143 154827349634438229 3459110 164797389423985216223068155 174717379524014718162660161 18452709941427751512183787 19449726973437682019183558 Explanation of low noise: air flow rate about 2 m 3 /min

74. Thank you for attention! There ain’t no such thing as a free lunch? Take a free dataset and enjoy!