Articles | Volume 18, issue 2
https://doi.org/10.5194/essd-18-801-2026
https://doi.org/10.5194/essd-18-801-2026
Data description article
 | 
02 Feb 2026
Data description article |  | 02 Feb 2026

Two decades of pHT measurements along the GO-SHIP A25 section in the North Atlantic

Fiz F. Pérez, Marta López-Mozos, Marcos Fontela, Maribel I. García-Ibáñez, Noelia Fajar, Xosé Antonio Padín, Mónica Castaño-Carrera, Mercedes de la Paz, Lidia I. Carracedo, Marta Álvarez, Herlé Mercier, Pascale Lherminier, and Antón Velo

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Cited articles

Álvarez, M., Fajar, N. M., Carter, B. R., Guallart, E. F., Pérez, F. F., Woosley, R. J., and Murata, A.: Global ocean spectrophotometric pH assessment: consistent inconsistencies, Environ. Sci. Technol., 54, 10977–10988, https://doi.org/10.1021/acs.est.9b06932, 2020. 
Álvarez, M., García-Ibáñez, M. I., Acerbi, R., Santiago-Domenech, R., Guallart, E. F., and Fajar, N. M.: Ocean acidification at the crossroads I: Harmonizing unpurified and purified meta-cresol purple spectrophotometric pHT measurements based on absorbance data, Limnol. Oceanogr.: Meth., https://doi.org/10.1002/lom3.70023, in press, 2025. 
Álvarez-Salgado, X. A., Nieto-Cid, M., Álvarez, M., Pérez, F. F., Morin, P., and Mercier, H.: New insights on the mineralization of dissolved organic matter in central, intermediate, and deep water masses of the northeast North Atlantic, Limnol. Oceanogr., 58, 681–696, https://doi.org/10.4319/lo.2013.58.2.0681, 2013. 
Amidror, I.: Scattered data interpolation methods for electronic imaging systems: A survey, J. Elect. Imag., 11, 157–176, https://doi.org/10.1117/1.1455013, 2002. 
Asselot, R., Carracedo, L. I., Thierry, V., Mercier, H., Bajon, R., and Pérez, F. F.: Anthropogenic carbon pathways towards the North Atlantic interior revealed by Argo-O2, neural networks and back-calculations, Nat. Commun., 15, 1630, https://doi.org/10.1038/s41467-024-46074-5, 2024. 
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Short summary
Ocean acidification threatens marine ecosystems and the climate and is commonly assessed through ocean pH measurements. This study provides a new twenty-year dataset of pH measurements from the North Atlantic, derived from the correction and reevaluation of both historical and recent pH measurements affected by methodological bias. This revised dataset enables a more accurate reassessment of pH trends and carbon variables under novel and updated methodological standards.
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