Publication Date:
2024-02-02
Description:
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.
Keywords:
Ammonium; Bottle, Niskin 30-L; Carbon, organic, particulate; Carbon/nitrogen analyser (GF/F filtered); Chlorophyll a; Chlorophyll a, fluorometric determination (Grasshoff et al., 1983, Chemie GmbH); Colorometric analysis, manual; Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1); Date/Time of event; DEPTH, water; Elevation of event; Event label; Gravimetric analysis (GF/F filtered); JGOFS; Joint Global Ocean Flux Study; Latitude of event; Longitude of event; M10/1; M10/1-RO6-241_003; M10/1-RO6-241_004; M10/1-RO6-245_006; M10/1-RO6-245_007; M10/1-RO6-249_009; M10/1-RO6-249_010; M10/1-RO6-254_011; M10/1-RO6-254_012; M10/1-RO6-260_013; M10/1-RO6-260_014; M10/1-RO6-266_016; M10/1-RO6-266_017; M10/1-RO6-273_020; M10/1-RO6-273_021; M10/1-RO6-279_024; M10/1-RO6-279_025; M10/1-RO6-283_028; M10/1-RO6-283_029; M10/1-RO6-287_031; M10/1-RO6-287_032; M10/1-RO6-292_034; M10/1-RO6-292_035; M10/1-RO6-361_039; M10/1-RO6-361_040; M10/1-RO6-366_044; M10/1-RO6-366_045; M10/1-RO6-370_046; M10/1-RO6-370_047; M10/1-RO6-376_049; M10/1-RO6-376_050; M10/1-RO6-382_054; M10/1-RO6-382_055; M10/1-RO6-387_058; M10/1-RO6-387_059; M10/1-RO6-387_060; M10/1-RO6-393_063; M10/1-RO6-393_064; M10/1-RO6-398_067; M10/1-RO6-398_068; M10/1-RO6-398_069; M10/1-RO6-403_071; M10/1-RO6-403_072; Meteor (1986); NABE; NIS_30L; Nitrate and Nitrite; Nitrite; Nitrogen, organic, particulate; North Atlantic Bloom Experiment, 1989-1991; Oxidation; then autoanalysis (GF/F filtered); Oxidation (alkaline) with borate buffered potassium persulphate; Phosphate; Phosphorus, particulate; Silicate; Silicon, particulate; Suspended matter, total
Type:
Dataset
Format:
text/tab-separated-values, 1700 data points
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