Application case GLODAP

GLODAP is an international database for oceanographic measurements. The Digital Earth Viewer can be used to explore and investigate the entire dataset.

The GLobal Ocean Data Analysis Project (GLODAP, Olsen et al. 2016) is an ongoing synthesis activity for ocean surface to bottom biogeochemical data. The overarching goal is to provide one product, i.e. one access point, with consistent quality controlled data of carbon relevant ship-based interior ocean observations. The related core variables (salinity, oxygen, phosphate, nitrate, silicate, dissolved inorganic carbon, total alkalinity, pH, CFC-11, CFC-12, CFC-113 and CCl4) are subjected to extensive quality control and are biased corrected. As of now, more than 1.2 million samples from almost 1000 different research cruises dating back to 1972 have been included in GLODAPv2.2020 (Olsen et al. 2020). This enables, among other things, the quantification of the ocean carbon sink, ocean acidification and evaluation of ocean biogeochemical models.

A living data product

Regular and frequent data updates have become inevitable given the urgency and complexity of climate change. Thus, starting with GLODAPv2.2019 we aim at yearly updates and decadal version releases in concert with the repeated hydrography observation program GO-SHIP. The decadal version releases encompass a full consistency analysis, including the usage of inversion models, of all present cruise data. As this is very time demanding the yearly updates are restricted to the addition- and bias-correction of new cruise data using the most recent GLODAP update as reference. Towards these more regular and frequent releases, the automation of the corresponding workflow is crucial. Presently however, the workflow of GLODAP still includes a fair bit of manual labor with some bottlenecks present.

High quality and intercomparable data – The workflow

HELMHOLTZ Research for Grand Challenges, 25 February 2022. Full article.

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