CarbonBridge 2014: Physical oceanography and microorganism composition during 5 cruises (Jan, March, May, August, Nov 2014) on and off the shelf northwest of Svalbard in 2014

• Main Authors: Paulsen, Maria Lund, Bratbak, Gunnar, Larsen, Aud, Seuthe, Lena, Egge, Jorun K, Erga, Svein Rune
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: Ammonium; B1; B11; B14; B16; B8; Bacteria; C1; C3; C4; C5; C6; C7; C8; Carbon; organic; dissolved; dissolved/Nitrogen; dissolved ratio; particulate; standard deviation; particulate/Nitrogen; particulate ratio; total; total/Nitrogen; total ratio; total per volume; CarbonBridge; CarbonBridge Bridging productivity regimes in the Arctic Ocean; CB201401; CB201401_B1; CB201401_B11; Arctic; Arctic Ocean; Svalbard
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.884255; https://doi.org/10.1594/PANGAEA.884255

Data were collected on and off the shelf northwest of Svalbard during cruises in January, March, May, August and November 2014. The sampling depths were 1, 5, 10, 20, 30, 50, 100, 200, 500, 750, and 1000 m, as well as at the depth of the Chl a maximum. The sampling concentrated on the core of the northwards drifting warm Atlantic water, which enters the Arctic Ocean north of Svalbard either south or north of the Yermark plateau. Transects were sampled across the core of the Atlantic water inflow at 79N, and additionally at 79.4N in May and August. Heavy drift ice restricted the sampling to the shelf and shelf-break in May and August 2014. During January, March, and November, the area north of Svalbard was largely ice-free, which allowed sampling off the shelf-break into the Arctic Ocean during winter. At all stations, depth profiles of temperature, salinity and fluorescence were taken with a CTD (Seabird SBE 911 plus). Water was sampled with Niskin bottles from discrete depths for analysis of inorganic nutrients, chlorophyll a (Chl a), microbial abundance, bacterial production (BP), as well as DOM and POM. In May and August, three process stations each (in datasheet referred to as P-stations: P1, P3, P4 in May, and P5, P6, P7 in August, at these stations more time-demanding processes were investigated, such as in situ primary production and vertical export of POM. Chl a was determined by filterig 100-500mL water onto Whatmann GF/F glass fiber filters. Chl a was determined fluorometrically (10-AU, Turner Designs) from triplicates of each filter type after extraction in 5 mL methanol at room temperature in the dark for 12 h without grinding. Abundances of microorganisms: picophytoplankton, nanophytoplankton, virus, heterotrophic bacteria, and heterotrophic nanoflagellates were determined on an Attune(R) Focusing Flow Cytometer (Applied Biosystems by Life technologies) with a syringe-based fluidic system and a 20 mW 488 nm (blue) laser. Samples were fixed with glutaraldehyde (0.5% final conc.) at 4°C for minimum 2 ...