This dataset was collected during the cruise MSM65 (GREENHAB II, 2017-06-25 – 2017-07-19) with RV MARIA S MERIAN from St. John's, Canada to Nuuk, Greenland. It contains chlorophyll a measurements [µg/L] from water samples collected from discrete sampling via CTD. In total, 46 stations have been sampled from various depth. To obtain chl-a concentrations water samples were filtered onboard through 0.7 μm pore size, glass fiber filters (Whatmann GF/F) under low vacuum. Filters were frozen immediately at -80 °C until extraction in laboratory via 90% acetone. Concentrations were calculated from fluorescence measured with a pre-calibrated Turner Design TD700 laboratory fluorometer (EPA445.0, Arar & Collins, 1997).

Chief Scientist of MSM65: Prof. Dr. Oliver Zielinski, Institute for Chemistry and Biology of the Marine EnvironmentFinancial support was kindly provided by the Deutsche Forschungsgemeinschaft (DFG), Senatskommission Ozeanographie (MerMet 15-85 Zielinski). Additional financial support was provided through funding from AWI (PACES program), WHOI and ICBM.