Concentrations of dissolved iron and dissolved iron(II) in water-column samples from major stations occupied during first and second legs of the U.S. GEOTRACES North Atlantic zonal transect cruises.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"GT10-11 - dFe and dFe-II","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":"
Data processing:<\/strong>
\nFollowing subtraction of appropriate blank values, sample concentrations were calculated using least-square linear regressions fit to daily calibration curves that were obtained by additions of iron and iron(II) standard solutions to low-iron seawater.<\/p>\nNote on concentration units: <\/strong>All analyses were performed on a volumetric basis, so all concentrations are reported in units of nanomole liter-1 (nM). To convert to units of nmol kg-1, divide the nM concentrations by 1.024 kg l-1 (the approximate density of seawater at a laboratory temperature of 20 degrees C).<\/p>\nBCO-DMO Processing Notes:<\/strong>
\nConverted original lon values in decimal degrees west to negative values (decimal degrees east); added column for official cruise_id and for cruise_part; converted original date from dd\/mm\/yyyy format to date in yyyymmdd format; added 'nd' to indicate 'no data' for depths not sampled; changed parameter names; added basic GEOTRACES metadata (see below).<\/p>\nAdditional GEOTRACES Processing:<\/strong>
\nAfter the data were submitted to the International Data Management Office, BODC, the office noticed that important identifying information was missing in many datasets. With the agreement of BODC and the US GEOTRACES lead PIs, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters: station_GEOTRC, cast_GEOTRC (bottle and pump data only), event_GEOTRC, sample_GEOTRC, sample_bottle_GEOTRC (bottle data only), bottle_GEOTRC (bottle data only), depth_GEOTRC_CTD (bottle data only), depth_GEOTRC_CTD_rounded (bottle data only), BTL_ISO_DateTime_UTC (bottle data only), and GeoFish_id (GeoFish data only). This added information will facilitate subsequent analysis and inter comparison of the datasets.<\/p>\nBottle parameters in the master file were taken from the GT-C_Bottle_GT10, GT-C_Bottle_GT11, ODF_Bottle_GT10, and ODF_Bottle_GT11 datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the Event_Log_GT10 and Event_Log_GT11 datasets. McLane pump cast numbers missing in event logs were taken from the Particulate Th-234 dataset submitted by Ken Buesseler.<\/p>\n
A standardized BCO-DMO method (called \"join\") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.<\/p>\n
If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.<\/p>\n
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