f86a468b-9bd1-40af-9a19-d5d9053a6774 dataset Piotr Kowlaczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl Piotr Kowlaczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl 2026-07-15T20:35:42.575751Z ISO 19115:2003/19139 1.0 WGS 1984 Particulate absorption spectra (350-750 nm) measured in water samples collected in the Fram Strait, during Fram Strait cruise (FS2025 - Cruise ID 2025007009) between 27 July - 14 August 2025. 2026-07-16T14:49:00 1 10.48457/IOPAN.2026.575 Piotr Kowalczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl Piotr Kowalczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl This data sets contains spectra of the light absorption coefficients of particles (ap(λ), m-1), detritus (ad(λ), m-1) and phytoplankton pigments (aph(λ), m-1) from samples collected during Fram Strait cruise (FS2025, - Cruise ID 2025007009, de Steur, 2026) onboard of research icebreaker r/v Kroprins Haakon, in the Fram Strait and East Greenland Shelf 27 July - 14 August 2025. Water samples were collected at three depths, near the surface at 5 m, close to at the Subsurface Chlorophyll-a Maximum (SCM) around 22-25 m, and below it at 50 m. The depth at which the SCM was located was determined from chlorophyll-a fluorescence profile measured by the standard fluorometer attached to the CTD rosette. Collected water samples were filtered onboard using Whatman filters (GF/F, 25 mm). Filters with the retained material were in deep frozen (-80 deg. C) and stored in these conditions until the measurements. Measurements were performed in the land based laboratory in the Institute of Oceanology Polish Academy of Sciences, Sopot, Poland, using a Perkin-Elmer Lambda 650 spectrophotometer equipped with an integrating sphere with a diameter of 15 cm. The spectra of light absorption coefficients were measured in the spectral range of 350-750 nm according to the methodology described by Tassan and Ferrari (1995, 2002) and Woźniak et al. (2011). Transmission and reflectance (T-R) measurements were performed for filters with suspended particles and again after bleaching with 2% sodium hypochlorite NaClO2 (Meler et al., 2020). To account for the optical path extension of light on the filter with suspension in relation to the same suspension in water, the beta factor correction was applied according to formulae developed by Stramski et al. (2015). This allowed to determine the spectra of the light absorption coefficient by all particles, ap(λ), as well as the absorption by bleached and mineral particles, (detritus - both organic and mineral), ad(λ). The light absorption coefficients by phytoplankton pigments aph(λ) were then calculated as the difference between ap(λ) and ad(λ). de Steur L., 2026. Fram Strait Cruise Report FS2025 27 July - 14 August 2025 (Cruise ID 2025007009). https://nva.sikt.no/registration/019cf81a85fd-1ea2ddb2-a573-4201-ac4a-dc5df450ad27 Meler, J., Woźniak, S.B., and Stoń-Egiert, J.: Comparison of methods for indirectly estimating the phytoplankton population size structure and their preliminary modifications adapted to the specific conditions of the Baltic Sea, J. Mar. Sys, 212, 103446, https://doi.org/10.1016/j.jmarsys.2020.103446, 2020. Tassan, S., Ferrari, G.M., 1995. An alternative approach to absorption measurements of aquatic particles retained on filters. Limnol. Oceanogr. 40(8), 1358–1368. Tassan, S., Ferrari, G.M., 2002. A sensitivity analysis of the ’transmittance-reflectance’ method for measuring light absorption by aquatic particles. J. Plankton Res. 24(8), 757–774. https://doi.org/10.1093/plankt/24.8.757 Woźniak, S.B., Meler, J., Lednicka, B., Zdun, A., and Stoń-Egiert, J.: Inherent optical properties of suspended particulate matter in the southern Baltic Sea. Oceanologia 53(3):691-729, https://doi.org/10.5697/oc.53-3.691, 2011. Study the surface variability of the carbonate chemistry in high Arctic fjords. Piotr Kowlaczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl Meler Justyna Institute of Oceanology Polish Academy of Sciences jmeler@iopan.pl Monika Zabłocka Institute of Oceanology Polish Academy of Sciences monika_z@iopan.gda.pl Piotr Kowalczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl Piotr Kowalczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl Artur Palacz Institute of Oceanology Polish Academy of Sciences palacz@iopan.pl Laura de Steur Norwegian Polar Institute laura.de.steur@npolar.no Mats Granskog Norwegian Polar Institute mats.granskog@npolar.no Piotr Kowlaczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl https://geonetwork.iopan.pl/geonetwork/srv/api/records/f86a468b-9bd1-40af-9a19-d5d9053a6774/attachments/images.png https://geonetwork.iopan.pl/geonetwork/srv/api/records/f86a468b-9bd1-40af-9a19-d5d9053a6774/attachments/1408x594.jpeg Bio-optical properties Inherent Optical Properties Greenland Sea Fram Strait Arctic Ocean particulate absorption detrital absorption phytoplankton absorption Arctic Ocean Continents, countries, sea regions of the world. 2015-07-17 geonetwork.thesaurus.external.place.regions CC-BY 4.0 eng oceans 2024-07-24 2024-08-09 Arctic Ocean -16.00 10.00 78.00 80.50 1 Piotr Kowlaczuk Institute of Oceanology Polish Academy of Sciences piotr@iopan.pl https://opendap.iopan.pl/opendap/data/csv/SeaQuester/Fram%20Strait%20cruise/abs_FS2025_ad.csv WWW:LINK-1.0-http--opendap abs_FS2025_ad.csv https://opendap.iopan.pl/opendap/data/csv/SeaQuester/Fram%20Strait%20cruise/abs_FS2025_ap.csv WWW:LINK-1.0-http--opendap abs_FS2025_ap.csv https://opendap.iopan.pl/opendap/data/csv/SeaQuester/Fram%20Strait%20cruise/abs_FS2025_aph.csv WWW:LINK-1.0-http--opendap abs_FS2025_aph.csv https://doi.org/10.48457/IOPAN.2026.575 DOI Digital Object Identifier (DOI) This study was funded by the Polish National Science Centre (NCN) OPUS26 project OptiCal-Green (2023/51/B/ST10/01344) granted to PK and the European Union’s Horizon Europe research and innovation programme under Grant Agreement No. 101136480 (SEA-Quester). This research has benefitted from transnational access to r/v Kronprins Haakon funded by the European Union HORIZON EUROPE through the EU Project POLARIN Grant Agreement ID: 101130949. The ship time on board of r/v Kronprins Haakon was provided by the Norwegian Polar Institute, Tromsø, Norway.