{"@context":{"content":"http:\/\/purl.org\/rss\/1.0\/modules\/content\/","dc":"http:\/\/purl.org\/dc\/terms\/","foaf":"http:\/\/xmlns.com\/foaf\/0.1\/","og":"http:\/\/ogp.me\/ns#","rdfs":"http:\/\/www.w3.org\/2000\/01\/rdf-schema#","sioc":"http:\/\/rdfs.org\/sioc\/ns#","sioct":"http:\/\/rdfs.org\/sioc\/types#","skos":"http:\/\/www.w3.org\/2004\/02\/skos\/core#","xsd":"http:\/\/www.w3.org\/2001\/XMLSchema#","owl":"http:\/\/www.w3.org\/2002\/07\/owl#","rdf":"http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#","rss":"http:\/\/purl.org\/rss\/1.0\/","site":"https:\/\/www.bco-dmo.org\/ns#","odo":"http:\/\/ocean-data.org\/schema\/","emo":"http:\/\/ocean-data.org\/schema\/entity-matching#","bibo":"http:\/\/purl.org\/ontology\/bibo\/","crypto":"http:\/\/id.loc.gov\/vocabulary\/preservation\/cryptographicHashFunctions\/","bcodmo":"http:\/\/lod.bco-dmo.org\/id\/","tw":"http:\/\/tw.rpi.edu\/schema\/","dcat":"http:\/\/www.w3.org\/ns\/dcat#","time":"http:\/\/www.w3.org\/2006\/time#","geo":"http:\/\/www.w3.org\/2003\/01\/geo\/wgs84_pos#","geosparql":"http:\/\/www.opengis.net\/ont\/geosparql#","sf":"http:\/\/www.opengis.net\/ont\/sf#","void":"http:\/\/rdfs.org\/ns\/void#","sd":"http:\/\/www.w3.org\/ns\/sparql-service-description#","dctype":"http:\/\/purl.org\/dc\/dcmitype\/","prov":"http:\/\/www.w3.org\/ns\/prov#","schema":"http:\/\/schema.org\/","geolink":"http:\/\/schema.geolink.org\/1.0\/base\/main#","spdx":"http:\/\/spdx.org\/rdf\/terms#","bcodmo_vocab":"http:\/\/schema.bco-dmo.org\/"},"@id":"http:\/\/lod.bco-dmo.org\/id\/dataset\/3348#graph","@graph":[{"http:\/\/lod.bco-dmo.org\/id\/dataset\/3348":{"@id":"http:\/\/lod.bco-dmo.org\/id\/dataset\/3348","@type":["http:\/\/ocean-data.org\/schema\/DeploymentDatasetCollection","http:\/\/www.w3.org\/ns\/dcat#Dataset","http:\/\/ocean-data.org\/schema\/Dataset"],"http:\/\/ocean-data.org\/schema\/hasAcquisitionDescription":[{"@value":"
The station plan generally had CTD stations at 30km resolution over the entire cruise, except for the first line from Montevideo (in which stations were further apart as the science party became more adept at running casts and processing water. After the first line was complete, a long diagonal line was run in a SW direction, with water sampling every station. For all subsequent stations, every other station was processed for a full water cast and CTD profile. The station design always placed the full stations at corners of the transit patterns. This station plan translated to a total of 152 stations, with 76 full-cast water stations. The CTD was equipped with an oxygen sensor and beam transmissometer (at 660nm). Stand-alone pumps (SAPS) were deployed at varying parts of the cruise, with two water depths sampled. A hand-deployed light meter was deployed daily at local apparent noon, weather conditions permitting. This provided spectral estimates of the diffuse attenuation. Experiments on ocean acidification were performed in deck incubators in ambient seawater tanks.<\/p>\n
In total 168 CTD profiles were completed on cruise KNOX22RR. The maximum depth of the profiles varied from less than 10 m for the collection of water for separate carboy experiments performed by other cruise participants to a maximum of 5204 m. Most casts, however, extended to ~1000 m offshore and were limited by topography along the shelf break and inshore.<\/p>\n
Profile casts down to 1000 m were interspersed with water collection casts to increase the along-track resolution of the hydrographic data and to resolve the deeper structure beyond the euphotic zone.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"CTD Profile Data","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":"
Final calibrated data (salinity and oxygen) for the downcast part of each profile of the CTD dataset collected during KNOX22RR (COPAS'08) cruise to the Patagonian Shelf<\/p>\n
The calibration procedure for both conductivity and for oxygen is explained in the processing description.<\/p>\n
Station Notes<\/em><\/strong> SeaBird CTD Processing<\/em> Additional data processing was continued within Mstar, a Matlab based data processing system developed at the National Oceanography Centre, Southampton. A brief summary of the processing steps and relevant scripts is provided below. Intermediate processing files have not been submitted to the BCO-DMO database. Only the final calibrated downcast data has been submitted (so called 2db files)<\/p>\n Basic CTD data processing<\/em> ctd1:<\/em> This carries out a de-spike on the .24Hz data and averages it into a 1Hz file, (ctd22RRnnnnn_1Hz). ctd2:<\/em> Requires the user to find the first in-water, deepest and last in-water data-cycle from the .1Hz file. This script then extracts data to correspond to the full up and down casts (ctd22RRnnnnn.ctu file) and purely the downcast (ctd22RRnnnnn.2db), averaged into 2db bins.<\/p>\n \nAdvanced data processing for calibration purposes<\/em> See dataset SAM Data Files<\/em><\/strong> samfir:<\/em> This creates a master file (samnnnnn) for the cast from a blank template file and pastes in selected variables from the fir22RRnnnnn file. Variable selection depends upon the variables listed in the template file.<\/p>\n sal0:<\/em> Converts and reformats the salinity bottle data from salinometry measurements from Excel text files into NetCDF format. Output file: salnnnnn.bot<\/p>\n passal:<\/em> Pastes salinity bottle file values from salnnnnn.bot into sam22RRnnnnn file. botcond:<\/em> Bottle salinities are twice converted to conductivity values using temperature from the primary and then secondary CTD sensors. This allows independent calibration of the two sensors. \nCTD calibration<\/em> SeaBird claims that the correct in-situ calibration for their conductivity sensors is a linear function of conductivity with no offset. Plots of conductivity difference against conductivity added support to this and therefore the calibration coefficients A and B were calculated as<\/p>\n conductivity = A* ( primary conductivity)<\/em> where<\/p>\n <\/p>\n and<\/p>\n <\/p>\n and cond2bot<\/sub><\/em> is the sample bottle conductivity determined with the secondary temperature variable. Residual conductivity differences calculated as bottle conductivity minus corrected Seabird conductivity (btc-uc) were typically \u00b10.003 mS\/cm for both channels but considerable scatter was present within the data.<\/p>\n The mean (\u00b1stdev) conductivity residuals were -0.000051\u00b10.0027 mS\/cm and 0.00000051\u00b10.0019 mS\/cm for conductivity channels 1 and 2 respectively.<\/p>\n \nOxygen calibration<\/em> The typical range of residual values (i.e. corrected Seabird oxygen concentration - bottle titration estimate) was \u00b10.06 ml\/l.<\/p>\n The mean (\u00b1stdev) residual estimate however was 0.0036\u00b10.0395 ml\/l.<\/p>\n \nBCO-DMO Edits<\/strong> Station Notes<\/em><\/strong>
\n- Station ctd22RRb2401: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RRb2501: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RRb2601: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RRb4701: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RRb6001: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RR08901: During the upcast communications with the CTD package failed
\nand the data files were considered corrupt and subsequently not processed. There is no data for this station
\n- Station ctd22RR14601: This station was scheduled but in the end not sampled due to time constraints. There is no data for this station
\n- Station ctd22RR14701: This station was scheduled but in the end not sampled due to time constraints. There is no data for this station<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"CTD - Profiles","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":"
\nData was acquired using SeaBird SeaSave for SBE 911 software (v7). Following each cast, data acquisition was stopped and saved to the deck unit PC. The logging software output four files per cast with the following forms: nnnnn.hex (raw data file), nnnnn.con (data configuration file), nnnnn.bl (contained record of bottle firing locations and nnnnn.hdr (header file), where 'nnnnn' was the 3-digit station number followed by the 2-digit cast number. Raw data files were processed using SeaBird SBE Data Processing software version 7.18b according to Scripps Oceanographic Institute protocols. Output files from the SeaBird processing were of the form nnnnn.cnv (binary up and down casts), nnnnn.btl and nnnnn.ros (bottle firing information). Instrument manufacturer calibrations are used in these processing stages.<\/p>\n
ctd0:<\/em> This converts the SBE processed 24Hz SeaBird .cnv file into netCDF format, setting the required header information.
\nOutput: ctd22RRnnnnn_24Hz<\/p>\n
\nSalinity, potential temperature and density are derived from the primary and secondary temperature and conductivity sensors using the international equation of state. Finally a 10 second averaged file is created, (ctd22RRnnnnn_10s).<\/p>\n
fir0:<\/em> This converts the SBE processed .ros file into netCDF format. It then takes relevant data-cycles from the .10s averaged file and pastes them into a new file fir22RRnnnnn containing the mean values of all the variables at the bottle firing locations.<\/p>\n
\nOutput file: sam22RRnnnnn.<\/p>\n
\nResult added to sam22RRnnnnn files.<\/p>\n
Conductivity calibration<\/em>
\nCalibration of the CTD conductivity (salinity) and oxygen sensors was performed on the data. The calibration of the two Seabird conductivity channels to the salinometry results revealed a generally good agreement in both cases but also highlighted the presence of a drift on the
\nprimary conductivity channel, as shown by plots of conductivity difference against station number (i.e. time). This suggests that conductivity 2 and temperature 2 (from the secondary CTD sensor) provide more reliable estimates of salinity although the overall impact of the drift on the primary channel remained small.<\/p>\n
conductivity = B* (secondary conductivity)<\/em><\/p>\n
\nCoefficient A was determined to be 1.000186 and coefficient B was determined to be 1.000098.
\nCorrected Seabird conductivities were calculated through the application of coefficient A to primary conductivity and coefficient B to the secondary conductivity channel.<\/p>\n
\nThe linear regression between Seabird 43 oxygen concentrations (in ml\/l) and manual Winkler titrations produced a regression equation of
\ny = 1.048204 * SBEoxy + 0.058575
\nwhere y = corrected oxygen concentration.<\/p>\n
\n- Original data contributed as NetCDF files
\n- ARM Tools<\/a> NetCDF Windows routine cdf2ascii.exe used to convert the data to ASCII format
\n- ARM Tools<\/a> NetCDF Windows routine ncdump.exe used to extract header information (parameters and sensors)
\n- CTD Station id, date, time, lat, lon imported from file: COPAS08_ctd_positions_updated.xls<\/p>\n
\n- Station ctd22RRb2401: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RRb2501: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RRb2601: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RRb4701: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RRb6001: Odd name due to unusual sampling positions (between stations)
\n- Station ctd22RR08901: During the upcast communications with the CTD package failed and the data files were considered corrupt and subsequently not processed. There is no data for this station
\n- Station ctd22RR14601: This station was scheduled but in the end not sampled due to time constraints. There is no data for this station
\n- Station ctd22RR14701: This station was scheduled but in the end not sampled due to time constraints. There is no data for this station<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"3348","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"CTD - Profiles"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2010-07-28T12:13:52-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2010-07-28T12:13:52-04:00","@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:3348","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/3348"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier3348"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"CTD Profile Data from R\/V Roger Revelle KNOX22RR in the Patagonian Shelf (SW South Atlantic) from December 2008 (COPAS08 project)","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"","@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\/spatialCoverage":[{"@value":"_:spatialCoverage3348"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Painter, S., Allen, J. 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