TY - DATA
T1 - Downward vertical flux of size-fractionated Chlorophyll-a and phaeopigments in the northern Barents Sea during August 2018, Nansen Legacy cruise 2018707 JC 1-2
AU - Bodur, Yasemin V.
AU - Dietrich, Ulrike
AU - Svensen, Camilla
AU - Reigstad, Marit
PY - 2023
PB - Norstore
UR - https://doi.org/10.11582/2023.00101
DO - 10.11582/2023.00101
ER -
Bodur, Y. V., Dietrich, U., Svensen, C., Reigstad, M. (2023).Downward vertical flux of size-fractionated Chlorophyll-a and phaeopigments in the northern Barents Sea during August 2018, Nansen Legacy cruise 2018707 JC 1-2 [Data set]. Norstore. https://doi.org/10.11582/2023.00101
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Description |
Samples for sinking mass flux of size-fractionated (>0.7µm and >10µm) Chlorophyll-a and Phaeopigments were collected with short-term drifting sediment traps between 75° and 85°N in the northern Barents Sea with R/V Kronprins Haakon in August 2018 as part of the Nansen Legacy project (cruise 2018707, JC 1-2). High-density bottom water was collected at the station and filtered (Whatman GF/F 0.7µm), and then filled into the trap cylinders (KC Denmark, aspect ratio >6) prior to their deployment. Afterwards, the sediment traps were deployed with 2 or 4 cylinders at each depth (30, 40, 60, 90, 120, 200m) for a duration between 22 to 25 hours. Depending on the sea ice conditions, the sediment traps were deployed in open water, anchored to a sea ice floe or within an ice lead. Upon retrieval, the content of the cylinders from each depth was pooled and stored at 4°C in dark until further analyses. Between 100-300ml were filtered onto 0.7µm GF/F filters (Whatman) for the analysis of Chla and Phaeopigments, depending on the amount of material in the traps. To quantify the contribution of larger cells, additional subsamples for Chla were filtered onto 10µm polycarbonate filters (Millipore). After filtration, both filters were immediately transferred to a tube with 100% methanol and stored between 12-24h at 4°C for pigment extraction. Size-fractionated Chla (0.7 and 10µm) was measured with a pre-calibrated Turner Design AU-10 fluorometer before and after acidification with 5% HCl. Chla and phaeopigments were calculated according to Holm-Hansen & Riemann, 1978.
Holm-Hansen, Osmund, and Bo Riemann. “Chlorophyll a Determination: Improvements in Methodology.” Oikos 30 (1978). https://doi.org/10.2307/3543338.
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