/* DATA DESCRIPTION:
Citation:	Voß, Daniela; Henkel, Rohan; Oelker, Julia; Badewien, Thomas Henry (2026): Hyperspectral underwater light field measured during the cruise MSM139 with RV MARIA S. MERIAN [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995340 (DOI registration in progress)
Abstract:	Data presented here were collected during the cruise MSM139 with MSM139 with RV Maria S. Merian from Reykjavik, Iceland to Reykjavik, Iceland (25.07 - 27.08.2025, working area Greenland). In total, 29 underwater light profiles were collected at 33 stations, using a free-falling hyperspectral light profiler. The system used was a SEABIRD HyperPro II (SN 189, former Satlantic), equipped with a irradiance sensor to measure downwelling irradiance (Ed, SN 532) and a radiance sensor for upwelling radiance (Lu, SN 421). A reference unit was attached to the ship to measure the above water irradiance (Es, SN 533). The sensors were calibrated by the manufacturer and validated prior to the cruise with a reference lamp. Data were recorded with the SatView software (V 2.9.5_7) and processed from raw to Level1, 1b, 2, 2s to Level 3a using the ProSoft Processing software (V 7.7.19_2). Measured data were binned in 0.5 m depth intervals. A dark correction was made automatically based on shutter measurements by the instrument. Measurements with a tilt higher than 5° were not taken into account during processing. Spectra were interpolated to 1 nm intervals. For each station the hyperspectral profiles for each parameter cover the wavelength range from 400-700 nm, for Ed and Es in [W/m² nm], for Lu in [W/m² nm sr]. For Ed, Lu and Es descriptive statistics are given including min, max, mean, median and standard deviation of the tilt and the photosynthetically active radiation PAR [µmol photons/m² s (sr)], integrated from 400 - 700 nm. Statistics are not given for profiles which do not reach the 1% PAR depth. To allow an assignment of above water conditions to the respective depth measurements, Es spectra were given as a function of depth, recalculated from data Level2s. The Profiler measurements were only conducted during daylight. Raw data are available on request from the principal investigator. 
	Chief Scientist of RV Maria S Merian cruise MSM139: Dr.Uwe John, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI).
Keyword(s):	Disco Bay; Ed; Es; GreenHab; Greenland; irradiance; Lu; Melville Bay; Narsaq; Nuuk; ocean color; radiance; Uummanaq
Related to:	John, Uwe; Christensen, Anneliese; Becks, Lutz; Thielecke, Antonia; Voß, Daniela; Henkel, Rohan; Oelker, Julia; Thome, Pauline; Andipalagan, Mathiroopini; Schmitt-Kopplin, Philippe; Clarke, Dave; Burfeid-Castellanos, Andrea M; Eikrem, Wenche; Lundholm, Nina; Nagai, Satoshi; Honorato, Ricardo; Kühne, Nancy; Kopplin, Leila (2025): Investigate and evaluate the risks of harmful algae blooms in Greenlandic waters due to climate change: Assessment of range expansion and HAB population connectivity, Cruise No. MSM139, 25.07.2025 - 27.08.2025, Reykjavík (Iceland) - Reykjavík (Iceland). MARIA S. MERIAN-Berichte, Begutachtungspanel Forschungsschiffe, MSM139, 50 pp, https://doi.org/10.48433/cr_msm139
Documentation:	Non-Exclusive Licence No. G25-007 for Utilization of Greenland Genetic Resources (2025). Naalakkersuisut - Government of Greenland, https://download.pangaea.de/reference/140046/attachments/Genetic%20Resource%20License%20No.%20G25-007.pdf
Funding:	Federal Ministry of Education and Research (BMBF) (URI: https://www.bmbf.de/), grant/award no. 03F0945A: GreenHAB: Risiken der durch den Klimawandel verursachten schädlichen Algenblüte in grönländischen Gewässern (URI: https://foerderportal.bund.de/foekat/jsp/SucheAction.do?actionMode=view&fkz=03F0945A)
Coverage:	MEDIAN LATITUDE: 67.978482 * MEDIAN LONGITUDE: -52.426881 * SOUTH-BOUND LATITUDE: 60.622179 * WEST-BOUND LONGITUDE: -58.719430 * NORTH-BOUND LATITUDE: 74.998851 * EAST-BOUND LONGITUDE: -45.423377
	DATE/TIME START: 2025-07-29T10:00:24 * DATE/TIME END: 2025-08-21T16:34:23
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Size:	3 datasets
*/
/* TABULAR SUMMARY OF DATASETS LISTED IN THIS COLLECTION: */
Filename	Citation of child dataset
MSM139_light_opt_Ed.tab	Voß, Daniela; Henkel, Rohan; Oelker, Julia; Badewien, Thomas Henry (2026): Downwelling irradiance Ed measured during the cruise MSM139 with RV MARIA S. MERIAN. https://doi.pangaea.de/10.1594/PANGAEA.995343
MSM139_light_opt_Es.tab	Voß, Daniela; Henkel, Rohan; Oelker, Julia; Badewien, Thomas Henry (2026): Above water irradiance Es measured during the cruise MSM139 with RV MARIA S. MERIAN. https://doi.pangaea.de/10.1594/PANGAEA.995345
MSM139_light_opt_Lu.tab	Voß, Daniela; Henkel, Rohan; Oelker, Julia; Badewien, Thomas Henry (2026): Upwelling radiance Lu measured during the cruise MSM139 with RV MARIA S. MERIAN. https://doi.pangaea.de/10.1594/PANGAEA.995347
