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External Data Spec

Global Ocean mean sea water pH time series and trend from Multi-Observations Reprocessing

External Data Spec Published 18 May 2022
1 min read
Global average of surface ocean pH from the Copernicus Marine Service, based on a reconstruction method using in situ data and remote sensing data, as well as empirical relationships. Indicator is available at annual resolution, and from the year 1985 onwards, up to 2020. Error on each yearly value varies, and is added in the data file sheet.
information.png Provider:
Copernicus CMEMS
information.png Dataset URL:
https://marine.copernicus.eu/access-data/ocean-monitoring-indicators/global-ocean-mean-sea-water-ph-time-series-and-trend-multi

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Produced figures

Figure Decline in ocean pH measured at the Aloha station (University of Hawaii) and yearly mean surface seawater pH reported on a global scale (Copernicus Marine Service) A decline in pH corresponds to an increase in the acidity of ocean water. Data originate from the Aloha station pH time series (adapted from Dore, J.E., et al., 2009, 'Physical and biogeochemical modulation of ocean acidification in the central North Pacific', Proceedings of the National Academy of Sciences of the United States of America 106:12235-12240). Changes here are similar to those that are observed over a shorter time frame in Europe (see here: http://www.climatechange2013.org/images/figures/WGI_AR5_Fig3-18.jpg). In figure, "In situ measurement (Aloha station)" corresponds to data based on in-situ measurements, while "Calculated (Aloha station)" corresponds to calculated data. Global annual average of surface ocean pH from the Copernicus Marine Service, based on a reconstruction method using in situ data and remote sensing data, as well as empirical relationships. Indicator is available at annual resolution, and from the year 1985 onwards. The error on each yearly value varies, and is added to the data file sheet. The estimated yearly uncertainty envelope shown in the figure is defined as the annual mean of pH ± 2 standard deviations, which corresponds to a 95% confidence interval of the mean estimate.
Figure
Archived
Decline in ocean pH measured at the Aloha station and yearly mean surface seawater pH reported on a global scale (Copernicus Marine Service) The figure shows a decline in pH corresponds to an increase in the acidity of ocean water and the global annual average of surface ocean pH from the Copernicus Marine Service, based on a reconstruction method using in situ data and remote sensing data, as well as empirical relationships.

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For references, please go to https://www.eea.europa.eu./data-and-maps/data/external/global-ocean-mean-sea-water or scan the QR code.

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