“…Snow depth was recorded by visual observation of the ice under which the SUIT was traveling: A marked stick extending from the starboard side of the ship helps in quantifying the thickness of snow on top of the ice floes that are tilted during the ship passage. Part of these data have been used in previous works to study the relationship of environmental properties of seaice habitats with the community structure of sympagic fauna in the Arctic Ocean (PS80 and PS92, David et al, 2015David et al, , 2016Schaafsma, 2018;Flores et al, 2019;Ehrlich et al, 2020), and in the Southern Ocean (PS81, Schaafsma et al, 2016Schaafsma et al, , 2017David et al, 2017), to develop and test algorithms for estimating inice chl a (PS80, Lange et al, 2016;Lange, 2017), to retrieve Arctic primary production on large scales in the Arctic summer (PS80 Lange, 2017;Lange et al, 2017b), and to estimate Arctic under-ice primary production based on under-ice irradiance measurements (PS92, Massicotte et al, 2019). All data collected during PS89 and PS106 are so far unpublished.…”