Atmospheric carbon dioxide monitoring using volunteer observing ship (TRANS HARMONY 1) servicing between Japan and Southeast Asia

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Data of atmosphere carbon dioxide monitoring using volunteer observing ship (TRANS HARMONY 1) servicing between Japan and Southeast Asia. This data contains the cruise track, carbon dioxide variables at the sea level atmosphere, parameters of atmosphere (temperature, sea level pressure) .


Release date
Temporal coverage
2018/03/22 - 2019/05/12
Data provider
Email: cgerdb_admin(at)
File format
Data volume
2 MB
ver.1.0 (Last updated: 2023/04/25)
Publications using this data set
Niwa, Y., Ishijima, K., Ito, A., and Iida, Y (2022) Toward a long-term atmospheric CO2 inversion for elucidating natural carbon fluxes: technical notes of NISMON-CO2 v2021.1. Prog Earth Planet Sci 9, 42, doi:10.1186/s40645-022-00502-6.
Handling precautions
This data set only removes anomalous values caused by malfunctions of observation equipment, and would contain high-concentration CO2 data caused by emissions from the ship itself. Therefore, we ask that users process the data by themselves based on statistical methods or other parameter changes, and kindly request that users utilize the data just after the processing.

Data Set

Calibrated atmospheric CO2, Temperature, Calibrated atmospheric pressure at sea level, O3
Time resolution
10 minutes
0.1 ppm
Observation period
2018/02/21 - 2019/05/13
Latitude: 10°S-40°N
Longitude: 100°E-140°E
Measurement method
Air is sampled by the a sampling inlet mounted ship's top deck using a diaphragm pump installed in the observation room. The sampled air is led into a measuring line where it goes through dehumidification at dehumidifier, after which the CO2 concentration are determined using a measuring equipment (NDIR). Every 8 hours, 4 cylinders of standard gases are measured and the CO2 concentration are calibrated. Calibration of the standard gases is carried out using the NIES09 standard gas series developed by NIES.
Calculation method
10 minute average is calculated and recorded based on the output from the NDIR every 10 seconds. The calibrated CO2 concentraions are the time-weighted average values calculated from the calibration curve right before and after the measurements.
[Free keywords]
Carbon dioxide, CO2 at the sea level atmosphere, Japan, Southeast Asia, Cargo ships
Update history
Data are released. ver.1.0.

Reference Information

Niwa, Y., Sawa, Y., Nara, H., Machida, T., Matsueda, H., Umezawa, T., Ito, A., Nakaoka, S.-I., Tanimoto, H., and Tohjima, Y (2021) Estimation of fire-induced carbon emissions from Equatorial Asia in 2015 using in situ aircraft and ship observations, Atmos. Chem. Phys., 21, 9455–9473, doi:10.5194/acp-21-9455-2021.
Nara, H., Tanimoto, H., Tohjima, Y., Mukai, H., Nojiri, Y. and Machida, T (2017) Emission factors of CO2, CO and CH4 from Sumatran peatland fires in 2013 based on shipboard measurements. Tellus B: Chemical and Physical Meteorology, 69(1), p.1399047, doi:10.1080/16000889.2017.1399047.

Terms and Conditions of Use*

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Citation format
When this data set is referred to in publications, it should be cited in the following format.
Nakaoka et al. (2023), Atmospheric carbon dioxide monitoring using volunteer observing ship (TRANS HARMONY 1) servicing between Japan and Southeast Asia route, ver.x.x*1, NIES, DOI:10.17595/20230425.001. (Reference date*2: YYYY/MM/DD)
*1 The version number is indicated in the name of each data file.
*2 As the reference date, please indicate the date you downloaded the files.

Advisory Service

Advisory service
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