0dc16d62-05f6-4bbe-9dc4-6d47825a5931 CERSAT Exploitation fpaf@ifremer.fr editor 2025-12-01T09:00:26.37575Z ISO 19115-3:2018 - Remote Sensing http://www.opengis.net/def/crs/EPSG/0/4326 OceanSODA standardised surface ocean carbonate system matchup dataset 2022-03-24 creation 2022-03-24 publication 3.4 OceanSODA-MMDB In recent years, large datasets of in situ marine carbonate system parameters (partial pressure of CO2 (pCO2), total alkalinity, dissolved inorganic carbon and pH) have been collated. These carbonate system datasets have highly variable data density in both space and time, especially in the case of pCO2, which is routinely measured at high frequency using underway measuring systems. This variation in data density can create biases when the data are used, for example for algorithm assessment, favouring datasets or regions with high data density. A common way to overcome data density issues is to bin the data into cells of equal latitude and longitude extent. This leads to bins with spatial areas that are latitude and projection dependent (eg become smaller and more elongated as the poles are approached). Additionally, as bin boundaries are defined without reference to the spatial distribution of the data or to geographical features, data clusters may be divided sub-optimally (eg a bin covering a region with a strong gradient). To overcome these problems and to provide a tool for matching in situ data with satellite, model and climatological data, which often have very different spatiotemporal scales both from the in situ data and from each other, a methodology has been created to group in situ data into ‘regions of interest’, spatiotemporal cylinders consisting of circles on the Earth’s surface extending over a period of time. These regions of interest are optimally adjusted to contain as many in situ measurements as possible. All in situ measurements of the same parameter contained in a region of interest are collated, including estimated uncertainties and regional summary statistics. The same grouping is done for each of the other datasets, producing a dataset of matchups. About 35 million in situ datapoints were then matched with data from five satellite sources and five model and re-analysis datasets to produce a global matchup dataset of carbonate system data, consisting of 287,000 regions of interest spanning 54 years from 1957 to 2020. Each region of interest is 100 km in diameter and 10 days in duration. An example application, the reparameterisation of a global total alkalinity algorithm, is shown. This matchup dataset can be updated as and when in situ and other datasets are updated, and similar datasets at finer spatiotemporal scale can be constructed, for example to enable regional studies. This dataset was funded by ESA Satellite Oceanographic Datasets for Acidification (OceanSODA) project which aims at developing the use of satellite Earth Observation for studying and monitoring marine carbonate chemistry. Peter Land PML PELAND@pml.ac.uk author Jean-François Piollé IFREMER jfpiolle@ifremer.fr author ESA funder IFREMER / CERSAT cersat@ifremer.fr distributor IFREMER / CERSAT cersat@ifremer.fr pointOfContact https://sextant.ifremer.fr/geonetwork/srv/api/records/0dc16d62-05f6-4bbe-9dc4-6d47825a5931/attachments/oceansoda.png oceansoda.png Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2018-01-01 publication 2018-07-27T14:39:48 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Cersat - Parameter 2024-07-26 publication 2024-07-26 publication geonetwork.thesaurus.local.theme.cersat_parameter OceanSODA Cersat - Project 2025-07-31 publication 2025-07-31 publication geonetwork.thesaurus.local.theme.cersat_project Historical Cersat - Latency 2024-07-26 publication 2024-07-26 publication geonetwork.thesaurus.local.theme.cersat_latency /Ocean Chemistry/Carbonate /Ocean Chemistry/Ph Cersat - GCMD parameter 2024-01-04 publication 2024-01-04 publication geonetwork.thesaurus.external.theme.GCMDparameter CDS-CERSAT Centre de données ODATIS 2024-10-16 publication 2024-10-16 publication geonetwork.thesaurus.local.theme.odatis_centre_donnees Variables ODATIS 2023-10-13 publication 2023-10-13 publication geonetwork.thesaurus.local.theme.odatis_variables CO2 Carbonate system ODATIS aggregation parameters and Essential Variable names 2025-07-29 publication 2025-07-29 publication geonetwork.thesaurus.external.theme.NVS.OD1 /Observational data/satellite Type de jeux de donnée ODATIS 2024-10-15 publication 2024-10-15 publication geonetwork.thesaurus.local.theme.type_jeux_donnee None CC-BY (Creative Commons - Attribution) IFREMER / CERSAT and PML. 2022. Standardised surface ocean carbonate system matchup dataset for OceanSODA project. Ver. 3.4. IFREMER, Plouzane, France. Dataset accessed [YYYY-MM-DD]. DOI: 10.12770/0dc16d62-05f6-4bbe-9dc4-6d47825a5931 grid 100 oceans -180.00 180.00 -90.00 90.00 Global 1952-01-01 2020-12-31 NetCDF 4 DOI Digital Object Identifier (DOI) https://data-cersat.ifremer.fr/data/ocean-carbonate/oceansoda-mmdb/ WWW:LINK IFREMER HTTP server HTTPS https://doi.org/10.12770/0dc16d62-05f6-4bbe-9dc4-6d47825a5931 DOI Digital Object Identifier (DOI)