https://doi.pangaea.de/10.1594/PANGAEA.995665Oelker, JuliaJuliaOelker0000-0002-0783-3617Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky Universität OldenburgKarstensen, JohannesJohannesKarstensen0000-0001-5044-7079GEOMAR - Helmholtz Centre for Ocean Research KielDilmahamod, Ahmad FehmiAhmad FehmiDilmahamod0000-0003-1110-940XGEOMAR - Helmholtz Centre for Ocean Research KielAlbinus, MichelleMichelleAlbinus0009-0004-4520-8830Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky Universität OldenburgHassoun, Abed El RahmanAbed El RahmanHassoun0000-0003-1940-215XGEOMAR - Helmholtz Centre for Ocean Research KielPANGAEA2026Chlorophyll aFluorescencePhaeophytin aDATE/TIMELATITUDELONGITUDEDEPTH, waterChlorophyll aPhaeophytin aPhaeophytin a/Chlorophyll a ratioFerryBoxCTD, Sea-Bird, SBE 911plusFluorometer, Turner Designs, Trilogy 7200-002 [EPA Method 445.0]Fluorometer, Turner Designs, Trilogy 7200-002MSM129/2Maria S. Merian2024-06-07T17:08:00/2024-07-04T10:10:00Dataset10.48433/cr_msm129_210.1594/PANGAEA.992566https://cfpub.epa.gov/si/si_public_record_report.cfm?Lab=NERL&dirEntryId=30941784 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalThis dataset was collected during the cruise MSM129/2 with RV MARIA S. MERIAN from St. John's, Canada to Reykjavik, Iceland. It contains chlorophyll-a measurements [µg/l] from water samples collected from the seawater supply (Reinseewassersystem, RSWS) to calibrate the fluorometers of the RSWS system. The outflow of a PocketFerrybox that was connected to the seawater supply in the hangar was used for sampling. It takes a substantial amount of time for the water to reach the hanger from the intake point. The time delay between the sensor readings of the RSWS and the PocketFerrybox was determined and the timestamps of the water sampling were adjusted accordingly. Given latitute and longitude refer to this corrected timestamp. The original time of water sampling in the hangar is given as an additional column with the comment time of sampling. 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 by 90% acetone method. Concentrations were calculated from fluorescence measured with a pre-calibrated Turner Design TD 7200-02 laboratory fluorometer (EPA445.0, Turner Manual).-52.663869999999974-33.4238900000000348.4125461.03255