Hydrochemistry measured on water bottle samples during METEOR cruise M10/1, supplement to: Passow, Uta; Peinert, Rolf (1993): The role of plankton in particle flux; two case studies from the northeast Atlantic. Deep Sea Research Part II: Topical Studies in Oceanography, 40(1-2), 573-585

• Main Authors: Passow, Uta, Peinert, Rolf
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 1993
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; Elevation of event; DEPTH, water; Ammonium; Nitrate and Nitrite; Nitrite; Phosphate; Silicate; Carbon, organic, particulate; Nitrogen, organic, particulate; Silicon, particulate; Chlorophyll a; Phosphorus, particulate; Suspended matter, total; Bottle, Niskin 30-L; Colorometric analysis, manual; Continuous Flow Automated Analysis Gordon et al., 1993, WOCE Tech Rpt 93-1; Carbon/nitrogen analyser GF/F filtered; Oxidation alkaline with borate buffered potassium persulphate; Chlorophyll a, fluorometric determination Grasshoff et al., 1983, Chemie GmbH; Oxidation; then autoanalysis GF/F filtered; Gravimetric analysis GF/F filtered; M10/1; Meteor 1986; Joint Global Ocean Flux Study JGOFS; North Atlantic Bloom Experiment, 1989-1991 NABE; North Atlantic; Northeast Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.65476; https://doi.pangaea.de/10.1594/PANGAEA.65476

The relationship between the vertical flux of microplankton and its standing stock in the upper ocean was determined in the subtropical (33°N, 21°W) and tropical (18°N, 30°W) northeast Atlantic in spring 1989 as part of the North Atlantic Bloom Experiment.In the subtropical area specific sedimentation rates at all depths were low (0.1% of standing stock) and 10-20% of settled particulate organic carbon (POC) was viable diatoms. The high contribution of viable diatoms, their empty frustules and tintinnid loricae to settled material characterized a system in transition between a diatom bloom sedimentation event and an oligotrophic summer situation.In the tropical area specific sedimentation rates were similar, but absolute rates (3 mg C m?2 day?1) were only about a third of those in the subtropical area. Microplankton carbon contributed only 2-6% to POC. Hard parts of heterotrophs found embedded in amorphous detrital matter suggest that particles had passed through a complex food web prior to sedimentation. Coccolithophorids, not diatoms dominated the autotrophic fraction in traps, and a shift in the composition of autotrophs may indicate a perturbation of the oligotrophic system.