Fatty acid composition of particulate organic matter (POM) collected from surface waters and bottom sea-ice of the Central Arctic Ocean during the MOSAiC expedition in 2019/2020

In situ-sample collection: 12 L Niskin bottles attached to the shipboard 24-bottle CTD-rosette; automatic pump phytoplankton sampler (PPS; serial number 12697-01, McLane; USA); 9-cm diameter KOVACS Mark II ice corer. Fatty acid analysis: FAME were quantified using an Agilent 6890N gas chromatograph (Agilent Technologies, USA) with a DB-FFAP capillary column (60 m, 0.25 mm I.D., 0.25 micrometer film thickness, Agilent Technologies, USA) supplied with a splitless injector and a flame ionization detector using temperature programming. Chromatogram data evaluation: Clarity chromatography software system (version 8.8.0, DataApex, Czech Republic)