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

Shin-ichiro Nakaoka^*1 (orcid.org/0000-0002-3870-1721)
^*1Earth System Division, National Institute for Environmental Studies (NIES)
Researcher Info (URL):https://researchmap.jp/nakaoka.shin-ichiro

2023/04/25

2018/03/22 - 2019/05/12

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

2 MB

ver.1.0 (Last updated: 2023/04/25)

English

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.

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.

10 minutes

0.1 ppm

2018/02/21 - 2019/05/13

Latitude: 10°S-40°N
Longitude: 100°E-140°E

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.

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

[2023/04/25]
Data are released. ver.1.0.

Hideki Nara
Earth System Division, National Institute for Environmental Studies (NIES)

Chisato Wada
Earth System Division, National Institute for Environmental Studies (NIES)

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.

CC BY 4.0 (Creative Commons Attribution 4.0 International)

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