@article{fdi:010094832,
  title = {{A}t-sea intercomparison of a membrane-based p{CO}2 sensor and a traditional showerhead equilibrator system on a {S}hip-of-{O}pportunity},
  author = {{M}acovei, {V}. {A}. and {L}ef{\`e}vre, {N}athalie and {D}iverr{\`e}s, {D}enis and {K}inski, {N}. and {L}isting, {O}. and {V}oynova, {Y}. {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he seawater partial pressure of carbon dioxide (p{CO}2) is an essential ocean variable needed to calculate air-sea gas exchange and to identify marine carbon sinks and sources. {R}ecent technological developments support autonomous p{CO}2 measurements with sensors that are smaller and cheaper. {I}n {J}uly 2021, these differences were highlighted during the {I}ntegrated {C}arbon {O}bservation {S}ystem-{O}cean {T}hematic {C}entre laboratory intercomparison exercise. {A} key message from the intercomparison was the need for further field comparisons. {H}ere we present the results from a field test of two generations of -4{H}-{J}ena {H}ydro{C} {CO}2-{FT} membrane-based sensors alongside a {G}eneral {O}ceanics equilibrator system. {T}he intercomparisons were done onboard a ship-of-opportunity regularly traveling between {E}urope and {S}outh {A}merica. {T}he first phase of the experiment took place in 2021, when the difference between the two instruments was within +/- 10 mu atm during 53% of the intercomparison time. {F}or the second phase, improvements were made, including the addition of an automated cleaning routine for the membrane-based sensor, the installation of a new sensor prototype with the ability to measure a reference gas, and an updated data processing method. {T}hese changes improved the performance and, during the last 2023 journey, the mean difference decreased to 2.0 +/- 5.0 mu atm, and was within +/- 10 mu atm during 97% of the deployment time. {T}his experiment revealed that with a suitable deployment approach considering biofouling and reference gas measurements, membrane-based sensors can measure seawater p{CO}2 within the {G}lobal {O}cean {A}cidification {O}bserving {N}etwork weather goal of 2.5% relative uncertainty on autonomous installations.},
  keywords = {{ATLANTIQUE}},
  booktitle = {},
  journal = {{L}imnology and {O}ceanography : {M}ethods},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[13 p.]},
  ISSN = {1541-5856},
  year = {2025},
  DOI = {10.1002/lom3.10719},
  URL = {https://www.documentation.ird.fr/hor/fdi:010094832},
}