N-ICE2015 particulate matter absorption spectra ...

• Main Authors: Kauko, Hanna, Pavlov, Alexey, Nystedt, Elina, Granskog, Mats A.
• Format: Dataset
• Language: unknown
• Published: npolar.no 2017
• Subjects: Sea ice
• Online Access: https://dx.doi.org/10.21334/npolar.2017.35978199; https://data.npolar.no/dataset/35978199-1ed9-4077-b6db-6b4347d5e8e8

Particle absorption coefficients (m-1) in seawater and sea ice. Samples were filtered onto 0.7 µm glassfiber filters and stored in -80 °C until analysis. Filters were measured between 240 and 800 nm with a Shimadzu UV-2450 dual-beam spectrophotometer with a Shimadzu ISR-2200 integrating sphere. Measurement was made before and after bleaching of pigments with 400 µl of sodium hypochlorite (NaClO) solution with 1 % active chlorine for 10 minutes. Additional 20 minutes was used if the first bleaching was not complete. Filters were rinsed with artificial sea water (60 g Na2SO4 in 1 L of ultrapure water). As wet reference an average of 20 filters (filtered with ultrapure water throughout the campaign) was used. A baseline correction was done relative to the mean absorption values at 750–800 nm. Method used follows the method by Tassan and Ferrari 2002 (https://doi.org/10.1093/plankt/24.8.757). More sampling details in Kauko et al. 2017 (https://doi.org/10.1002/2016JG003626), Pavlov et al. 2017 ...