Table 1.

Overview of ice station 1–7 with date, time of day (local time), latitude, longitude, CTD and Chl a fluorometer vertical transect from 0 to 200 m depth (all stations) from RV Helmer Hanssen, depth of water samples for pigment (all pigments by HPLC and corresponding in vitro Chl a analyses) and in vivo photosynthesis

Station	Date May	Time	Latitude	Longitude	Water sample depths (m)	Photosynthesis sample depths (m)	Pigments sample depths (m)	AUV sample depths (m)
1	15	10–13	80.665°N	5.048°E	2, 10	2, 10	2, 10
2	15	22–01	80.673°N	5.100°E	2, 10, 40	2, 10, 40	2, 10, 40
3	16	10–18	80.640°N	5.024°E	10, 45	10, 45	10, 45	5–55
4	16	23–24	80.607°N	4.841°E
5	17–18	24–01	80.566°N	4.918°E
6	17–18	24–01	80.528°N	5.097°E
7	18	03–04	80.416°N	5.307°E

Downwelling irradiance E_PAR and vertical net hauls of phytoplankton (both from surface to 50 m depths) were carried immediately after CTD profiles