Multiscale statistical analysis of thermal and non-thermal components of seawater <i>p</i>CO<sub>2</sub> in the Western English Channel: scaling, time-reversibility, and dependence

Robache, Kévin; Schmitt, François G.

doi:10.5194/bg-22-8093-2025

Articles | Volume 22, issue 24

https://doi.org/10.5194/bg-22-8093-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-22-8093-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 24

Research article

|

19 Dec 2025

Research article |

| 19 Dec 2025

Multiscale statistical analysis of thermal and non-thermal components of seawater pCO₂ in the Western English Channel: scaling, time-reversibility, and dependence

Kévin Robache and François G. Schmitt

Data sets

ASTAN cardinal buoy (western English Channel, France) data from 2015 to 2019 Y. Bozec, S. Loisel, and S. Bureau https://doi.org/10.17882/106537

Thermal and non-thermal components of pCO₂ estimated from ASTAN cardinal buoy (western English Channel) data from 2015 to 2019 K. Robache and F. G. Schmitt https://doi.org/10.17882/106550

Model code and software

ggmagnify: create a magnified inset of part of a “ggplot” object D. Hugh-Jones https://github.com/hughjonesd/ggmagnify

tidyverse: easily install and load the “tidyverse”, version 2.0.0 H. Wickham and RStudio https://doi.org/10.32614/CRAN.package.tidyverse

ggplot2: create elegant data visualisations using the grammar of graphics, version 3.5.1 H. Wickham, W. Chang, L. Henry, et al. https://doi.org/10.32614/CRAN.package.ggplot2

Short summary

Partial pressure of CO₂ (pCO₂) measurements were collected on the Astan buoy over nearly 5 years. Using advanced statistical tools, this study revealed that pCO₂ variations, along with other parameters, follow turbulent and intermittent dynamics. We highlights the irreversibility of the thermal and non-thermal components of pCO₂ and explores their links to temperature, biological production, and atmospheric or terrigenous inputs, providing new insights into high-frequency pCO₂ variability.

Multiscale statistical analysis of thermal and non-thermal components of seawater pCO2 in the Western English Channel: scaling, time-reversibility, and dependence

Data sets

Model code and software

Multiscale statistical analysis of thermal and non-thermal components of seawater pCO₂ in the Western English Channel: scaling, time-reversibility, and dependence