Atmospheric black carbon mass concentration data from ground-based observations at Ogata Village in Akita Prefecture during December 2022

Yousuke Yamashita^*1 (orcid.org/0000-0002-6813-4668), Makoto Inoue^*2(orcid.org/0000-0002-6826-5334)
^*1Earth System Division, National Institute for Environmental Studies (NIES)
^*2Akita Prefectural University

2025/11/13

2022/12/09 - 2022/12/22

NIES
Email: cgerdb_admin(at)nies.go.jp

CSV

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ver. 1.0 (Last updated: 2025/11/13)

English

Dataset is part of: Program suite for analyzing and visualizing ground-based observation data and GEOS-CF model data, DOI:10.34462/0002000337

black carbon

Regional

1 hour

2022/12/09 - 2022/12/22

40.00°N, 139.95°E

Elevation: -3 m;
Observation altitude: 1.2 m
Absolute altitude: -1.8 m

The continuous observation of BC was carried out using a pocket-sized BC aerosol monitor, the MicroAeth AE51 (AethLabs Co. Ltd.). The outside air is drawn in by the internal pump of the AE51 and then collected on on a PTFE-coated glass fiber filter. The filter is exposed to 880 nm light, and the transmitted light is measured to convert it into BC concentration. The AE51's flow rate was set to 200 ml/min, and measurements were taken every minute.

The equivalent BC (EBC) concentrations obtained with AE51 (EBCmeas) were converted to EBC using light attenuation (ATN) values and a correction function derived by comparing with that of the other reference instruments near emission source regions (Miyakawa et al., 2020). EBC = EBCmeas /f, where f=1.16(1 - 0.0044ATN),
where, EBCmeas is the raw data of the EBC concentrations measured using the AE51. Unstable values from AE51 sometimes persisted immediately after the start or just before the end of the measurements, as well as intermittently during the measurement period. To exclude these erroneous values, when deriving the 1-hour means from the 1-minute measurements, any negative 1-hour mean or any 1-hour mean with a standard deviation greater than the mean was considered missing data. Additionally, abnormally high values (>1000 ng/m3) during the measurement period were excluded as invalid values. If more than 75% (45 samples) of the 1-minute values within an hour were valid and positive, the hourly mean was calculated with positive/negative values for that hour.

[Free keywords]
[GCMD_Platform]
[GCMD_Science]

[2025/11/13]

Yousuke Yamashita (orcid.org/0000-0002-6813-4668)
Earth System Division, National Institute for Environmental Studies (NIES)

Takuma Miyakawa^*1(orcid.org/0000-0001-5529-2627), Takeshi Nagayoshi^*2
*1Japan Agency for Marine-Earth Science and Technology
^*2Akita Prefectural University

Takeya Okubo, Daigo Muto
Akita Prefectural University

Grants-in-Aid for Scientific Research (KAKENHI)

JP20K12155

CC BY 4.0 (Creative Commons Attribution 4.0 International)

When this data set is referred to in publications, it should, as a general rule, be made in the following format.