Spectrophotometric measurements of absorption coefficients by non-algal particles during POLARSTERN cruise PS113 along an Atlantic Transect

• Main Authors: Bracher, Astrid, Liu, Yangyang, Xi, Hongyan, Wiegmann, Sonja
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: absorption; Absorption coefficient; non-algal particles; at 350 nm; at 352 nm; at 354 nm; at 356 nm; at 358 nm; at 360 nm; at 362 nm; at 364 nm; at 366 nm; at 368 nm; at 370 nm; at 372 nm; at 374 nm; at 376 nm; at 378 nm; at 380 nm; Arctic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.938185; https://doi.org/10.1594/PANGAEA.938185

Water samples were taken during the transatlantic (10 May to 9 June 2018) expedition PS113 with RV Polarstern. Water samples were collected from CTD Niskin bottles at six different depths from the upper 100 to 180 m and additionally from the ship's seawater supply pumped through teflon tubing from about 11m depth during underway further described for HPLC based phytoplankton pigment data in Bracher et al. (2020). All collected samples were filtered through 25 cm Whatman GF/F filters, respectively, under low-vacuum pressure (below 200 mbar). Blank filters were collected by soaking them in 0.2um filtered seawater. Measurements for particulate and non-algal (NAP) absorption were performed directly after filtration the quantitative filtration techniques-intergrative cavity measurement device and procedure from Röttgers et al. (2016) as described in Liu et al. (2018). Phytoplankton absorption (aph) was derived by subtracting the NAP from the particulate absorption.