Spectrophotometric measurements of absorption coefficients and optical density by total particles, phytoplankton and non-algal particles during POLARSTERN cruise PS99 ...

• Main Authors: Liu, Yangyang, Wiegmann, Sonja, Bracher, Astrid
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2019
• Subjects: absorption; non-algal particles; optical density; particulate matter; Phytoplankton; Arctic Amplification AC3; FRontiers in Arctic marine Monitoring FRAM; Arctic
• Online Access: https://dx.doi.org/10.1594/pangaea.907648; https://doi.pangaea.de/10.1594/PANGAEA.907648

Absorption coefficients (abs) and optical density (OD) by total particles, phytoplankton and non-algal particles (NAP) were measured with standard deviation (sd) estimated on water samples collected from underway AC-S flow-through system outflow and CTD. Measurements were performed using QFT-ICAM (Röttgers et al., 2016) as described in Liu et al. (2018) and Liu et al. (2019).1. About sampling:a) underway samples were collected from unfiltered AC-S outflow (depth: 11m); CTD samples with 5-6 depths were collected on upcast.b) vacuum pressure for filtration: maximum 200 hPac) samples were measured fresh (not preserved).d) blank filters were collected by soaking them in 0.2um filtered seawater.e) replicates were not collected.2. About measurements:a) Instrument: light source: UV-VIS lamp (CF-1000- HC lamp, Illumination Technology, USA); absorption meter: Quantitative Filter Technique - Integrating Cavity Absorption Meter (QFT-ICAM) (Röttgers et al., 2016) with 80 mm- diameter integrating sphere; detector: ... : We acknowledge the AWI autonomous underwater vehicle (AUV) team, especially Sandra Tippenhauer and Thorben Wulff for providing samples from AUV “PAUL“. ...