In this study we present dissolved and particulate silicon isotope results in surface waters obtained as part of the GEOTRACES central Arctic Ocean section GN04 (2015) onboard POLARSTERN cruise PS94 (ARK-XXIX/3).The aim of the study was to investigate in more detail the influence of the Transpolar Drift on the Si cycle in the AO comparing areas with and without its influence.

Flag scheme in accordance to GEOTRACES quality flag policy. https://www.geotraces.org/geotraces-quality-flag-policy/Notes:calculated δ30Si-DSi: Dissolved Silicon Isotope Composition calculated from δ29Si-DSi multiplied by 1.93 (De La Rocha, 2002) calculated 2SD δ30Si-DSi: Dissolved Silicon standard deviation calculated from δ29Si-DSi standard deviation multiplied by 1.93 (De La Rocha, 2002) calculated δ30Si-bSiO2: Biogenic Silica Isotope Composition calculated from δ29Si-bSiO2 multiplied by 1.93 (De La Rocha, 2002) calculated 2SD δ30Si-bSiO2: Biogenic Silica standard deviation calculated from δ29Si-bSiO2 standard deviation multiplied by 1.93 (De La Rocha, 2002)