A dataset of global ocean alkaline phosphatase activity

Utilisation of dissolved organic phosphorus (DOP) by marine microbes as an alternative phosphorus (P) source when phosphate is scarce can help sustain non-Redfieldian carbon:nitrogen:phosphorus ratios and efficient ocean carbon export. However, global spatial patterns and rates of microbial DOP utilisation are poorly investigated. Alkaline phosphatase (AP) is an important enzyme group that facilitates the remineralisation of DOP to phosphate and thus its activity is a good proxy for DOP-utilisation, particularly in P-stressed regions. We present a Global Alkaline Phosphatase Activity Dataset (GAPAD) with 4083 measurements collected from 79 published manuscripts and one database. Measurements are organised into four groups based on substrate and further subdivided into seven size fractions based on filtration pore size. The dataset is globally distributed and covers major oceanic regions, with most measurements collected in the upper 20 m of low-latitude oceanic regions during summer since 1997. This dataset can help support future studies assessing global ocean P supply from DOP utilisation and provide a useful data reference for both field investigations and modelling activities.

Automated summary

Utilisation of dissolved organic phosphorus (DOP) by marine microbes as an alternative phosphorus (P) source can help sustain non-Redfieldian carbon:nitrogen:phosphorus ratios and efficient carbon export. This study presents a Global Alkaline Phosphatase Activity Dataset (GAPAD), which includes measurements of alkaline phosphatase activity collected from various oceanic regions. The dataset can support future studies on global ocean P supply from DOP utilisation and provide a reference for field investigations and modelling activities.