Progress
On track or target met
On track or target met

Desired direction: Sustainment

Sub-categories

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Headline data

Average marine acidity (pH) measured at agreed suite of representative sampling stations
Year Value Units
2010 8.08 pH
2011 8.08 pH
2012 8.08 pH
2013 8.08 pH
2014 8.07 pH
2015 8.08 pH
2016 8.07 pH
2017 8.07 pH
2018 8.07 pH
2019 8.07 pH
2020 8.07 pH

Geographical Area:

Unit of Measurement:

Footnote:

Methodological sheet of the indicator available for the Autonomous Community of the Basque Country.

Available indicator

Average sea acidity (pH) measured at an agreed set of representative sampling stations
Definition

Average sea acidity (pH) measured at an agreed set of representative sampling stations
Theoretical formula \[{AMM}^t = \overline{pH^t}\]

where:

$\overline{pH^t}=$ arithmetic mean of the in-situ pH collected on the 15th of each month at the measuring stations in year $t$
Frequency

Annual
Observations

The allocation of measuring stations by autonomous communities is carried out according to their nearest land point
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Indicator calculated using a methodology harmonised across the central statistical bodies of the autonomous communities
Data last updated 2025/05/08
Metadata last updated 2025/06/06

This section provides more information about the United Nations indicator or the European Union Sustainable Development Indicator, such as its rationale, international results, metadata, and other relevant statistics.

Rationale

The ocean absorbs up to 30% of the annual emissions of anthropogenic CO2 to the atmosphere, helping to alleviate the impacts of climate change on the planet. However, this comes at a steep ecological cost, as the absorbed CO2 reacts with seawater and results in shifts in the dissolved carbonate chemistry including increased acidity levels in the marine environment (decreased seawater pH).

Ocean acidification has potentially direct consequences for marine life and cascades through to the services provided by the open ocean and coastal areas including food and livelihood, tourism, coastal protection, cultural identity, transportation and recreation. The impacts on ocean services from ocean acidification may be lessened through appropriate monitoring and improved understanding of variability and rates of change, helping to inform mitigation and/or adaptation strategies.

Source: United Nations Statistics Division
Link to UN metadata

Metadata 14-3-1.pdf
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