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.

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, 20 11.

Date (Publication): 2026-07-16T14:49:00

Edition: 1

Citation identifier

No information provided.

Code: 10.48457/IOPAN.2026.575

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
Institute of Oceanology Polish Academy of Sciences	Piotr Kowalczuk	piotr@iopan.pl	Publisher
Institute of Oceanology Polish Academy of Sciences	Piotr Kowalczuk	piotr@iopan.pl	Point of contact

Purpose: Study the surface variability of the carbonate chemistry in high Arctic fjords.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Institute of Oceanology Polish Academy of Sciences	Piotr Kowlaczuk	piotr@iopan.pl	Point of contact
Institute of Oceanology Polish Academy of Sciences	Meler Justyna	jmeler@iopan.pl	Author
Institute of Oceanology Polish Academy of Sciences	Monika Zabłocka	monika_z@iopan.gda.pl	Author
Institute of Oceanology Polish Academy of Sciences	Piotr Kowalczuk	piotr@iopan.pl	Author
Institute of Oceanology Polish Academy of Sciences	Piotr Kowalczuk	piotr@iopan.pl	Resource provider
Institute of Oceanology Polish Academy of Sciences	Artur Palacz	palacz@iopan.pl	Resource provider
Norwegian Polar Institute	Laura de Steur	laura.de.steur@npolar.no	Resource provider
Norwegian Polar Institute	Mats Granskog	mats.granskog@npolar.no	Resource provider

Maintenance and update frequency: As needed

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Institute of Oceanology Polish Academy of Sciences	Piotr Kowlaczuk	piotr@iopan.pl	Originator

Keywords

Bio-optical properties
Inherent Optical Properties
Greenland Sea
Fram Strait
Arctic Ocean
particulate absorption
detrital absorption
phytoplankton absorption

Continents, countries, sea regions of the world.

Arctic Ocean

Access constraints: License

Use constraints: License

Other constraints: CC-BY 4.0

Spatial representation type: Text, table

Language: eng

Character set: UTF8

Topic category

Oceans

Begin date: 2024-07-24

End date: 2024-08-09

Description: Arctic Ocean

Reference system identifier: WGS 1984

Distribution format

Name	Version
	1

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
Institute of Oceanology Polish Academy of Sciences	Piotr Kowlaczuk	piotr@iopan.pl	Author

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--opendap	https://opendap.iopan.pl/opendap/data/csv/SeaQuester/Fram%20Strait%20cruise/abs_FS2025_ad.csv	abs_FS2025_ad.csv
WWW:LINK-1.0-http--opendap	https://opendap.iopan.pl/opendap/data/csv/SeaQuester/Fram%20Strait%20cruise/abs_FS2025_ap.csv	abs_FS2025_ap.csv
WWW:LINK-1.0-http--opendap	https://opendap.iopan.pl/opendap/data/csv/SeaQuester/Fram%20Strait%20cruise/abs_FS2025_aph.csv	abs_FS2025_aph.csv

OnLine resource

Protocol	Linkage	Name
DOI	https://doi.org/10.48457/IOPAN.2026.575	Digital Object Identifier (DOI)

Hierarchy level: Dataset

Statement: 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.

Metadata

File identifier: f86a468b-9bd1-40af-9a19-d5d9053a6774 XML

Metadata language: English

Character set: UTF8

Hierarchy level: Dataset

Hierarchy level name: dataset

Date stamp: 2026-07-15T20:35:42.575751Z

Metadata standard name: ISO 19115:2003/19139

Metadata standard version: 1.0

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Institute of Oceanology Polish Academy of Sciences	Piotr Kowlaczuk	piotr@iopan.pl	Author
Institute of Oceanology Polish Academy of Sciences	Piotr Kowlaczuk	piotr@iopan.pl	Originator

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