Details on the files in the data set: Concentration of suspended chlorophyll a, phaeophytin, particulate organic carbon (POC), and particulate organic nitrogen (PON) at 3 stations on the East Greenland continental shelf (65.62-70.14 N, 21.93-37.63 W) in May 2022, project ECOTIP

As part of the project ECOTIP, a field campaign was conducted on the East Greenland continental shelf in May 2022. 

Three stations were sampled from the tourist icebreaker Le Commandant Charcot: station LCC1 on 13 May 2022, station LCC2 on 14 May 2022, and station LCC3 on 17 May 2022. 

The data are presented here in three different files netCDF files, with the file title and the ID referring to the sampling station and sampling date (YYYYMMDD). 
-	ECOTIP_LCC1_WaterSampling_20220513.nc
-	ECOTIP_LCC2_WaterSampling_20220514.nc
-	ECOTIP_LCC3_WaterSampling_20220517.nc

At each station water was collected with a Nansen water sampler at 5, 15, 35, and 90 m water depth (exception: LCC1 lacks 90 m sample, because bottom depth was 45 m). 

The collected water was analysed for the following parameters: 
1) the concentration of total (> 0.7 micrometre) chlorophyll a (Chl a) (mg Chl a m^-3), 
2) the concentration of Chl a > 10 micrometre (mg Chl a > 10 micrometre m^-3), 
3) the concentration of total (> 0.7 micrometre) phaeophytin (mg Phaeo m^-3), 
4) the concentration of particulate (>0.7 micrometre) organic carbon (POC) (mg POC m^-3), 
5) the concentration of particulate (>0.7 micrometre) organic nitrogen (PON) (unit PON mg m^-3), and 
6) the atomic ratio of PON:PON. 

Water samples from each station and sampling depth were analysed for the concentration of chlorophyll a (Chl a), Chl a > 10 micrometre, phaeophytin (Phaeo), particulate organic carbon (POC) and nitrogen (PON). For total Chl a and Phaeo concentration, triplicate subsamples of 400 mL were filtered onto GF/F filters. In addition, one replicate of 500 mL was filtered on 10 micrometre Millipore filters to determine the concentration of the Chl a > 10 micrometre fraction. The filters were stored frozen (-20 C) until analysed with a Turner design fluorometer after 20 h extraction in 5 mL ethanol and according to the acidification method (Holm-Hansen et al. 1965). For POC and PON, triplicates of 500 mL aliquots of the water sample were filtered onto pre-combusted GF/F filters. The filters were stored frozen (-20 C) until analysed on an elemental analyser (440 Elemental Analyser, Exeter Analytical) after fuming with concentrated HCl to remove inorganic carbon (calcium carbonate) for 24 h.

Additional data are also available from this field campaign:
-	Hydrography data from the three sampling stations and two additional CTD stations: https://doi.org/10.11582/2023.00046
-	Protist community composition at the three stations LCC1-3: https://doi.org/10.15468/pyxaqm