Seawater Mg/Ca and Sr/Ca ratios worldwide from 2009 to 2017 collected in 79 cruises, including coupled measured data for temperature, salinity, total alkalinity, DIC, DO, and calculated pH and CO2 (NCEI Accession 0171017)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: October 13, 2025 | Last Modified: 2018-03-10T00:00:00.000+00:00

This dataset consists of seawater Mg/Ca and Sr/Ca ratios, temperature, salinity, total alkalinity, DIC and DO measured from 79 cruises between 2009 and 2017. The long debate about the conservative behaviour of seawater Mg/Ca and Sr/Ca ratios becomes more complex by studying the ocean as a whole and not only open ocean settings or the deep sea. In this project we measured in 79 cruises around the world seawater Mg/Ca and Sr/Ca ratios to discover that the modern ocean ranges are well beyond the pre-assumed values used by modellers, paleoceanographers and experimentalists as the basis for their work (Mg/Ca = 4.5 to 6.5 mol:mol and Sr/CA = 7 to 9.8 mmol:mol). We find out that modern seawater ranges are similar to the last 20 million years (Neogene) increase in these ratios, challenging the pre-assumed knowledge and a good number of methods used that assume a constant seawater Mg/Ca or Sr/Ca ratio. We agree that open ocean, the deep sea and reconstructions of past seawater based on samples derived from these settings give a good representation, but by no means they represent the ocean as a whole, especially coastal areas, upwelling zones, polar waters, and even the euphotic zone.

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0171017 partial pressure of carbon dioxide - water pH SALINITY total alkalinity TOTAL CARBON WATER TEMPERATURE carbon dioxide (CO2) gas analyzer temperature sensor laboratory analyses MULTIPLE SHIPS OF GERMANY Kiel University Kiel University World-Wide Distribution oceanography EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY CO2 ANALYZERS > CO2 ANALYZERS TEMPERATURE SENSORS > TEMPERATURE SENSORS GEOGRAPHIC REGION > GLOBAL OCEAN AT52BR

Complete Metadata

describedByType	application/octet-steam
identifier	gov.noaa.nodc:0171017
issued	2018-03-10T00:00:00.000+00:00
landingPage	https://www.ncei.noaa.gov/contact
language	[]
references	[ "https://doi.org/10.1073/pnas.1918943117" ]
rights	otherRestrictions
spatial	180.0,-90.0,-180.0,90.0
temporal	2009-01-01T00:00:00+00:00/2017-01-01T00:00:00+00:00

Location