10.1594/PANGAEA.996416Mehdipour, EhsanEhsanMehdipourAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenXi, HongyanHongyanXi0000-0003-2827-0603Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenBracher, AstridAstridBracher0000-0003-3025-5517Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenPANGAEA2026Atlantic OceanAtlantic Ocean transectChlorophyll aphytoplankton functional typesspectrophotometryUnderway measurementsEvent labelDATE/TIMELATITUDELONGITUDEChlorophyll aChlorophyll a, DiatomsChlorophyll a, DinoflagellataChlorophyll a, HaptophytaChlorophyll a, Green AlgaeChlorophyll a, ProkaryotesChlorophyll a, logarithmChlorophyll a, Diatoms, logarithmChlorophyll a, Dinoflagellata, logarithmChlorophyll a, Haptophyta, logarithmChlorophyll a, Green Algae, logarithmChlorophyll a, Prokaryotes, logarithmChlorophyll a, logarithm, uncertaintyChlorophyll a, Diatoms, logarithm, uncertaintyChlorophyll a, Dinoflagellata, logarithm, uncertaintyChlorophyll a, Haptophyta, logarithm, uncertaintyChlorophyll a, Green Algae, logarithm, uncertaintyChlorophyll a, Prokaryotes, logarithm, uncertaintyUnderway cruise track measurementsBase-10 logarithm (log10)PS113Polarstern4-D Phytoplankton composition from small to large scale by data fusion using AI (4D-Phyto)FRontiers in Arctic marine Monitoring (FRAM)International Science Program for Integrative Research in Earth Systems (AWI_INSPIRES)2018-05-10T17:22:00/2018-06-09T12:56:00Dataset10.1109/JSTARS.2026.369619510.1016/j.dsr2.2025.10556810.5281/zenodo.21737214404550 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalThis dataset provides high-spatial-resolution (approximately 300 m) estimates of total chlorophyll a concentration and chlorophyll a concentrations of five phytoplankton functional types, including diatoms, dinoflagellates, haptophytes, green algae, and prokaryotic phytoplankton. The products were generated by applying an EOF–GLM model to particulate absorption spectra derived from continuous hyperspectral spectrophotometric measurements of absorption and beam attenuation acquired through the ship's underway seawater intake system during RV Polarstern cruise PS113 between 10 May and 9 June 2018. The model was trained using paired ACS-derived particulate absorption spectra and HPLC-derived pigment observations and subsequently applied to the complete particulate absorption dataset to generate continuous chlorophyll a concentrations. The final products were averaged into 1 min intervals and include the associated uncertainty estimates. Further details on the methodology are provided in Mehdipour et al. (2026a, 2026b) and Bracher et al. (2026).-60.7169530.501904-47.65861650.393368Helmholtz Association of German Research Centreshttps://doi.org/10.13039/501100001656HIDSS-0005Helmholtz School for Marine Data Science (MarData)