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To understand the vertical variations of carbon fluxes in biologically productive waters, four autonomous Carbon Flux Explorers (CFEs) and ship-lowered CTD-interfaced particle-sensitive transmissometer and scattering sensors were deployed in a filament of offshore flowing recently upwelled water during the June 2017 California Current Ecosystem \u2013 Long Term Ecological Research process study. The Lagrangian CFEs operating at depths from 100-500\u00a0m yielded carbon flux and its partitioning with size from 30 \u00b5m \u20131 cm at three intense study locations within the filament and at a location outside the filament.<\/p>\n
The Carbon Flux Explorer (CFE) dives below the surface make particle flux observations at target depths as it drifts with currents. The Optical Sedimentation Recorder (OSR) wakes once the CFE has reached the target depth. On first wake-up of a given CFE dive, the sample stage is flushed with water and images of the particle-free stage are obtained. Particles settle through a 1-cm opening hexagonal celled light baffle into a high-aspect ratio funnel assembly before landing on a 2.54 cm diameter glass sample stage. At 25-minute intervals, particles are imaged at 13 \u00b5m pixel resolution in three lighting modes: dark field, transmitted and transmitted-cross polarized.<\/p>\n
Sampling procedures described in Bourne et al., <\/em>2019 and Bishop et al., <\/em>2016.<\/p>\n Different particle classes (anchovy pellets, copepod pellets and >1000 \u00b5m aggregates) dominated the 100-150 m fluxes during successive stages of the filament evolution as it progressed offshore. Fluxes were very high at all locations in the filament; below 150\u00a0m, flux was invariant or increased with depth at the two locations closer to the coast. Martin curve \u2018b\u2019 factors for total particulate carbon flux were +0.1, +0.87, -0.27, and -0.39 at the three successively occupied locations within the plume, and in transitional waters, respectively. Particle transfer efficiencies between 100 to 500 m were far greater within both filament and California Current waters than calculated using a classic Martin \u2018b\u2019 factor of -0.86. Interestingly, the flux profiles for all particles <400 \u00b5m were a much closer fit to Martin; however, most (typically >90%) of particle flux was carried by >1000 \u00b5m sized aggregates. Mechanisms to explain a factor of three flux increase between 150 and 500 m at the mid plume location are investigated. \u00a0<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":" Size fractionated Particulate Carbon Flux 100-500m measured by autonomous Carbon Flux Explorers deployed from R\/V Roger Revelle (RR1701),\u00a0CCE-LTER process study (P1706), between June 2 and July 1, 2017 in the California Current Regime.<\/p>\n These data are submitted with this manuscript: Bourne et al.,<\/em> 2020<\/p>\n \u00a0<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"Carbon Flux Explorer CCE_LTER P1706 - Particulate Carbon Flux","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":" The software package ImageJ 1.52 (IJ, National Institutes of Health) was used for particle size analysis. In this method, we manually inspected the 4 to 5 sequential attenuance images taken during a two hour long image cycle to determine the point of onset of particle overlap. The image at this point was subtracted from the image of the clean sample stage taken immediately preceeding the image set.<\/p>\n A threshold of 0.04 attenuance unts and above was used to define the presence of particles to facilitate particle identification. At this threshold setting, large aggregates were fully detected; however, touching particles \u2013 particularly 200-400 \u00b5m sized fecal pellets were not separable. Each IJ-identified \u201cparticle\u201d with multiple units was counted and these counts assigned to its sequence number. Inspection of the imagery also identified touching aggregates which were similarly treated.<\/p>\n During secondary data processing (using written Fortran codes), the area of each multi-unit \u201cparticle\u201d was divided by the number of subunits, and its particle number was changed from 1 to the determined count. Living organisms rarely appeared in images;\u00a0 when when they did appear, we were able to identify Pteropods, Amphipods, Copepods, Siphonophores, Acantharia, Radiolaria, and Foraminifera. These, identified living particles were removed from the secondary processed data. Total particle attenuance (average particle attenuance times particle area) and particle number were binned into 65 logarithmically spaced size catagories from (30 \u00b5m to 20000 \u00b5m).<\/p>\n Data from each image cycle were weighted by the total number of images in that cycle; data from the multiple imaging\/cleaning cycles during a dive were binned and weighted by the duration of each imaging cycle. The particle attenuance and number size-binned data were scaled to convert results to flux units (mATN\u2013cm2 cm\u20132 d\u20131; and number m\u20132 d\u20131). The partitioning of particle flux was further broken into 30-100,100-200,200-400,400-1000, and >1000 \u00b5m categories. The 200-400 \u00b5m bin primarily was populated by the numerous ovoid pellets. The >1000 \u00b5m bin was dominated by aggregates.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"823408","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"Carbon Flux Explorer CCE_LTER P1706 - Particulate Carbon Flux"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2020-09-10T09:17:35-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2020-09-10T09:17:35-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2023-07-07T16:10:26-04:00","@type":"xsd:dateTime"}],"http:\/\/rdfs.org\/ns\/void#inDataset":[{"@id":"http:\/\/www.bco-dmo.org\/"}],"http:\/\/ocean-data.org\/schema\/namedGraph":[{"@value":"urn:bcodmo:dataset:823408","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/823408"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier823408"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"Size fractionated Particulate Carbon Flux 100-500m measured by autonomous Carbon Flux Explorers deployed during the CCE-LTER process study (P1706) between June 2 and July 1, 2017 in the California Current Regime.","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"Size fractionated Particulate Carbon Flux 100-500m measured by autonomous Carbon Flux Explorers deployed during the CCE-LTER process study (P1706) between June 2 and July 1, 2017 in the California Current Regime.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/ocean-data.org\/schema\/temporalExtent":[{"@value":"_:temporalExtent823408"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage823408"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Bishop, J. 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