Tippenhauer, Sandra

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CTD Data RV Heincke HE598Data Processing ReportContents1 Introduction 12 Workflow 13 Expedition details 34 Sensor Layout 35 Processing 36 Results 5Contact:Dr. Sandra TippenhauerAlfred-Wegener-InstituteKlußmannstr. 3d, D-27570 Bremerhaven, GERMANYMail: info@awi.deProcessing Agency:FIELAX GmbHSchleusenstr. 14, D-27568 Bremerhaven, GERMANYMail: info@fielax.deRef.: CTD-HE598-report.pdf Vers.: 1 Date: 2022/07/11 Status: final1 IntroductionThis report describes the processing of CTD raw data acquired by Seabird SBE 911plus CTD onboard RV Heincke during expedition HE598.2 WorkflowThe different steps of processing and validation are visualized in Figure 1. The CTD raw data aredelivered from Dr. Sandra Tippenhauer (AWI). The station book of the RV Heincke cruise is extractedfrom the DAVIS SHIP data base (https://dship.awi.de). The first CTD station and cast is processedmanually in SBE Data Processing to configure the *.psa Seabird routines Data Conversion, WildEdit, Bottle Summary, Split, Translate, Cell Thermal Mass, Loop Edit and Bin Average. The Seabirdroutines are then run in a batch job CTDjob in ManageCTD to process the complete CTD dataset. The downcast of each CTD station/cast is used for further processing. In CTDjob the startrecord and the lowest altimeter point of the downcast is selected. With the Utilities → Dship Ebookfunction of ManageCTD the DAVIS SHIP station book extraction is used for getting the headerinformation of all CTD stations/casts of the cruise. ManageCTD Utilities → Find Profile functioncompares station times of the header with the entries in the station book to find out the correctnaming of the stations and casts. In CTDheader in ManageCTD the header information of each CTDstation/cast is displayed, controlled and corrected if necessary. CTDdespike in ManageCTD is usedfor a visual check of the data and to erase/interpolate spikes in the data if necessary. Additionally, asensor pair (Temp1/Sal1 or Temp2/Sal2) is chosen for each station/cast of the RV Heincke cruise inCTDdespike.ManageCTD Utilities → CheckDoubleSensors controls the quality of temperature and conductivitysensors. For this purpose outliers of too high sensor pair differences could be removed. The data isthen converted to spreadsheet format with dsp2odv for visualization of the data in Ocean Data View(ODV). The second visual inspection of the CTD data allows a comparison with data from other CTDcasts from close-by stations to verify the oxygen sensor data. Therefore, potential reference cruisedata is downloaded from PANGAEA (http://www.PANGAEA.de). The reference data is convertedto *.mat format. In the ManageCTD Final Processing the CTD data is displayed together with thereference data. Bad data points, sensors or casts are interpolated or erased from the data set andfilters are applied if necessary. The processed CTD data are written to text files and imported toPANGAEA (http://www.PANGAEA.de) for publication.Page 1 of 8Figure 1: CTD data Processing WorkflowPage 2 of 83 Expedition detailsVessel name RV HeinckeExpedition number HE598Expedition leader Wurl, OliverExpedition start 30.04.2022 BremerhavenExpedition end 22.05.2022 BremerhavenDuration 22 daysNo. of CTD casts 106BSH ID 20220158Expedition report https://doi.pangaea.de/10.48433/cr_he598Expedition map https://download.pangaea.de/reference/113265/attachments/HE598_nav.jpgEvent list https://www.pangaea.de/expeditions/events/HE5984 Sensor LayoutThis chapter describes the CTD sensors mounted during this cruise:SBE 911plus CTD (SN: 1015), SBE Instrument Configuration Version 7.23.0.1.ID Sensor Name Serial No. Calibration Date55 TemperatureSensor 4918 05-Mar-213 ConductivitySensor 3810 09-Feb-2145 PressureSensor 1015 26-Jan-1755 TemperatureSensor 5110 05-Mar-213 ConductivitySensor 3827 02-Feb-120 AltimeterSensor Valeport None71 WET_LabsCStar 435 None20 FluoroWetlabECO_AFL_FL_Sensor 1365 7.1.20225 ProcessingDetails of processing procedures and processing parameters are described in CTD Processing Log-book of RV Heincke (hdl:10013/epic.47427).Density Inversions and Manual ValidationObvious outliers were removed manually. For the visual check density inversions > 0.005 kg/m3 and> 0.01 kg/m3 were flagged differently for display but not removed automatically. Decisions whetherthe flagged values were manually removed or not are based on the description in CTD ProcessingLogbook of RV Heincke (hdl:10013/epic.47427).Page 3 of 8Sensor DifferencesFigure 2: Data accuracy of sensor pairs HE598Page 4 of 86 ResultsA complete processing overview for each sensor at each station is summarized in the table in theAppendix (Figure 3).Double Sensor CheckIn Figure 2, the absolute residuals between the two sensorpairs are shown for the measured param-eters Temperature and Conductivity and the derived parameter Salinity. Measurements in shallowwater depths < 15 m (blue crosses) and gradients between two datapoints exceeding a definedthreshold (red crosses) were omitted for accuracy calculation.Accuracy Measurements re-movedRemaining measure-mentsParameter given by manufacturer Surface 0-15m + gradi-ent filterwithin accuracy specifi-cationsTemperature ±0.001◦C 51.39% 75.81%Conductivity ±0.003mS/cm 42.88% 59.49%Salinity ±0.0015PSU 41.55% 31.46%Comments• 106 CTD raw data sets delivered• 1 CTD cast had no station book entry(HE598_11_11) but was processed using the informationfrom the CTD header file.• 1 station book entry had no corresponding CTD cast (HE598_2-15)• 106 CTD casts processed and uploaded• of these 10 processed CTD casts:– 0 oxygen profiles deleted (spiky and not matching to reference casts)– 437 data points interpolated– 59 data points erasedPage 5 of 8Result filesText File (HE598_phys_oce.tab):The format is a plain text (tab-delimited values) file.Column separator Tabulator "\t"Column 1 Event labelColumn 2 Date/Time of eventColumn 3 Latitude of eventColumn 4 Longitude of eventColumn 5 Elevation of eventColumn 6 DEPTH, waterColumn 7 Pressure, waterColumn 8 Temperature, waterColumn 9 ConductivityColumn 10 SalinityColumn 11 Temperature, water, potentialColumn 12 Density, sigma-theta (0)Column 13 OxygenColumn 14 Oxygen, saturationColumn 15 Attenuation, optical beam transmissionColumn 16 FluorometerColumn 17 Number of observationsProcessing Report (CTD-HE598-report.pdf):This PDF document.Page 6 of 8Figure 3: CTD data Processing Summary HE598Page 7 of 8Figure 4: ODV Screenshot of HE598 CTD dataPage 8 of 8

CTD Processing Report of RV Heincke HE598

https://epic.awi.de/id/eprint/56593/1/CTD-HE598-report.pdf

CTD Processing Report of RV Heincke HE598

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