Deployment of drifting buoys with pCO 2 sensors in the Pacific Ocean

Akihiko Murata, Yoshiyuki Nakano, Shuhei Masuda, Sayaka Yasunaka, Kousei Sasaoka, Masahide Wakita

Research output: Chapter in Book/Report/Conference proceedingConference contribution


To reduce areas lacking data of surface seawater pCO2, which is an indispensable property for the evaluation of atmospheric CO2 uptake by the ocean, in 2016 we started a 5-year project to deploy drifting buoys with pCO2 sensors in the South Pacific. The drifting buoy is compact (diameter, 315 mm; height, 566 mm; weight, ~10 kg) and easy to manage. For efficient deployment, we determined appropriate deployment positions along a ship track by particle tracking experiments. During the MR16-09 cruise of R/V Mirai, we deployed seven drifting buoys. The tracks of drifting buoys generally followed those predicted by the experiments. pCO2 values observed by drifting buoys and considered to be reliable were on the whole within values expected from interpolated pCO2 values. However, the pCO2 sensor needs to be improved to raise the pCO2 observation yield ratio of each drifting buoy.

Original languageEnglish
Title of host publication2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538616543
Publication statusPublished - 2018 Dec 4
Externally publishedYes
Event2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018 - Kobe, Japan
Duration: 2018 May 282018 May 31

Publication series

Name2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018


Other2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018


  • Drifting buoy
  • PCO2 sensor
  • South Pacific
  • Spectrophotometry
  • Surface seawater pCO2

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Oceanography
  • Space and Planetary Science
  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Acoustics and Ultrasonics
  • Instrumentation


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