The Human Impacts Database

A collection of useful numbers for quantifying the impacts of the human presence on Earth.

This quantity comes from a time series measurement and the most recent value (2019) is reported.


Value:		8.055 ± 0.001 pH units see this value in other units This is equivalent to... [H⁺] ≈ 0.2 parts per billion
HuID:		90472
Relevant Year(s):		2019
Summary:		The global annual average pH of the surface ocean. Ocean acidification is quantified by a decrease in pH: a decrease in pH value means an increase in acidity [H⁺].
Method:		Measurements are taken from the Copernicus Marine Service and based on a reconstruction method using in situ data and remote sensing data, as well as empirical relationships. The indicator is available at annual resolution, from the year 1985 onwards. The estimated yearly uncertainty envelope shown in the figure is defined as the annual mean of pH ± 2 × the standard deviation, which corresponds to a 95 % confidence interval of the mean estimate.
Source:		Copernicus Marine Environment Monitoring Service (CMEMS) Ocean acidification: Indicator assessment. (2019)
Dataset:		Global ocean pH trend (CMEMS_trends_ocean_pH.csv) global resolution
Trend:
Original Data License:		EEA Public Domain
Added By:		ilopezgo