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      <r:Content xml:lang="sv">Filer CTD_NBP2202_***.txt
Postprocesserat data från SeaBird-sensorerna.
Data fält: 
Tid (Matlabformat) - Tid (UTC) i Matlabs konvention (01-Jan-1900 00:00:00 är 693962.0)
Tryck (dBar)
Latitud (decimalgrader)
Longitud (decimalgrader)
Absolute Salinitet (g/kg) beräknad enligt http://www.teos-10.org
Konservative temperatur (grader) beräknad enligt http://www.teos-10.org
Syrgashalt (ml/l)
Andel smältvatten (dimensionslös), beräknad enligt Wåhlin et al, 2024

Instrument: 
Dubbla paket bestående av en SBE19plus, en SBE43, och en pump (SBE5T) som opererades parallellt under alla dyk. Paketen har separarerade slangpaket med intag nära varandra.

Följande är serienummer på sensorerna: 
Barbord: SBE19plus, serienummer: 19-7869, ingen SBE43
Styrbord: SBE19plus, serienummer: 19-7880 och SBE43, serienummer: 0081 
SBE43 hade följande kalibreringskoefficienter: Soc = 0.5418; Voffset = -0.4828; Tau = 1.14; A = -4.1263e-003; B = 1.3268e-004; C = -2.1621e-006; Enom = 0.036; 

Postprocessering:
Följande steg i postprocesseringen har gjorts: 
1) Generell kontroll av kvalitet. Barbords pump hade en dålig kabel och eftersom det inte var något offset mellan barbord och styrbord så tog vi bort alla data från barbords sensorpaket. 
2) Identifiera och ta bort spikar och anomalier. Spikar identifierades med följande filter:  
[b,a] = butter(5,0.1,'low');  
Gränsen för spik gavs av följande parametrar: Temperatur: 0.1; Salinitet 0.01 och syrgashalt: 0.1.
3) Binnat data till 1 Hz från 4 Hz som det är i rådata
4) Justera offset baserat på fartygets post-processerade CTD (som kalibrerades efter expeditionen; se https://www.usap-dc.org/view/project/p0010249). Offset var +0.026 mS/cm för konduktivitet, +0.0002 oC för temperatur, och +0.22 ml/l för syrgashalt.

 
Filer NBP2202_**_10m.txt
Isdraft (dvs djupet på gränsytan mellan hav och is) så som den definieras av multistrålekolod EM2040CX med serienummer 2105. Instrumentet monterades uppåtseende och med med 300 kHz frekvens. Data med kvalitetsflagga 13 eller högre lästes in i Eiva Navimodel Producer och griddades till 10 m. Datafälten är:

latitud (decimalgrader), 
longitud (decimalgrader)
Isdraft (m)

Filer NBP2202_**_2m.txt
Isdraft (dvs djupet på gränsytan mellan hav och is) så som den definieras av multistrålekolod EM2040CX med serienummer 2105. Instrumentet monterades uppåtseende och med med 300 kHz frekvens. Data med kvalitetsflagga 13 eller högre lästes in i Eiva Navimodel Producer och griddades till 2 m. Datafälten är:

latitud (decimalgrader), 
longitud (decimalgrader)
Isdraft (m)

Filer NBP2202_**_1m.txt
Isdraft (dvs djupet på gränsytan mellan hav och is) så som den definieras av multistrålekolod EM2040CX med serienummer 2105. Instrumentet monterades uppåtseende och med med 300 kHz frekvens. Data med kvalitetsflagga 13 eller högre lästes in i Eiva Navimodel Producer och griddades till 1 m. Datafälten är:

latitud (decimalgrader), 
longitud (decimalgrader)
Isdraft (m)

Fil CTD_PostProcessed.txt
Temperatur, salinitet och djup från en SBE49 CTD profil tagen genom ett borrhål genom isen på position  74° 22' 12.5328" S, 112° 32' 26.2782" W (74.370062 S, 112.540718 W). En Seabird SBE49 (SN 0219) FastCAT CTD profilerare monterades i en specialkonstruerad ram och fästes vid en winch-kabel med mekanisk terminering samt en elektronisk terminering för live-streamning av data. Ett nedkast och ett uppkast av salinitet och temperatur utfördes kl 14:46 UTC den 7 Feb 2022, med samplingrate 16 Hz. Kasten tog ungefär en timme varje väg. CTDn tillbringade ett par minuter vid havsbotten (1226 dB, enligt en RBRsolo), vilket gav upphov till artifakter i saliniteten på väg upp från botten. 
Post-processering: Data har filtrerats, justerats för pumpens hastighet samt binnats till 5 cm genom att använda SeaBirds post-processeringsalgoritmer (version 7.26.7.129). Ingen korrektion för termisk massa har gjorts. En offset-kalibrering gentemot (kalibrerade) CTD data från RV/IB Nathaniel B. Palmer och från AUVn gjordes, och konduktivitet skiftades därmed +0.015 mS/cm. Instrumentets noggranhet är ±0.002 °C och ±0.0003 S m−1 för temperatur och konduktivitet, respektive. 
Data fält:
tryck (dB)
Konservativ temperatur (grader)
Absolut salinitet (g/kg)


Fil dotson_cast_downcast.cnv
Rådata för borrhåls-CTDn
Datafält:
Tryck (dB)
Conduktivitet (mS/cm)
Temperatur (in situ, oC)
Scan (räknad)
Flagga</r:Content>
      <r:Content xml:lang="en">Files CTD_NBP2202_***.txt
Post processed data from the SeaBird sensor packages.
Data fields: 
Time (Matlab time) - Time (UTC) as serial date number in Matlab convention (where 01-Jan-1900 00:00:00 is 693962.0)
Pressure (dBar)
Latitude
Longitude
Absolute Salinity (g/kg) calculated according to http://www.teos-10.org
Conservative temperature (degrees) calculated according to http://www.teos-10.org
Dissolved Oxygen (ml/l)
Meltwater Fraction (dimensionless), calculated according to Wåhlin et al, 2024

Instrument: 
Dual packages consisting of one SBE19plus, one SBE43, and one pump (SBE5T) operating simultaneously. The packages had separated tubing systems but with inlets close to each other.

The following are the serial numbers of the sensors:
Port: SBE19plus, serial number: 19-7869, no SBE43 mounted
Starboard: SBE19plus, serial number: 19-7880 and SBE43, serial number: 0081 
The SBE43 had the following calibration coefficients: Soc = 0.5418; Voffset = -0.4828; Tau = 1.14; A = -4.1263e-003; B = 1.3268e-004; C = -2.1621e-006; Enom = 0.036; 

Post processing:
The following post processing was done to the raw data:
1) General check of data, removal of data while the vehicle was still in air. The pump for the port sensor had a bad cable. Since there was no growing offset we discarded all port data and only post processed the starboard data.
2) Spike removal using the following low pass filter: 
[b,a] = butter(5,0.1,'low');  
The following were the spike size limits: Temperature: 0.1; Salinity 0.01 and dissolved oxygen: 0.1.
3) Bin average to 1 Hz from the 4 Hz raw data
4) Offset adjustment based on the post-cruise calibrated ship CTD data (https://www.usap-dc.org/view/project/p0010249). These offsets were +0.026 mS/cm for conductivity, +0.0002 oC for temperature, and 0.22 ml/l for dissolved oxygen.

 
Files NBP2202_**_10m.txt
Ice draft (i.e. depth of the ice-ocean interface) as identified from the EM2040CX multibeam with serial number 2105. The instrument was mounted looking upwards, and operated at 300 kHz frequency. Data of quality higher than 13 was read into Eiva Navimodel Producer and gridded at 10 m grid. The data fields are:
latitude (decimal degrees), 
longitude (decimal degrees)
ice draft (m)

Files NBP2202_**_2m.txt
Ice draft (i.e. depth of the ice-ocean interface) as identified from the EM2040CX multibeam with serial number 2105. The instrument was mounted looking upwards, and operated at 300 kHz frequency. Data of quality higher than 13 was read into Eiva Navimodel Producer and gridded at 2 m grid. The data fields are 
latitude (decimal degrees)
longitude (decimal degrees)
ice draft (m)

Files NBP2202_**_1m.txt
Ice draft (i.e. depth of the ice-ocean interface) as identified from the EM2040CX multibeam with serial number 2105. The instrument was mounted looking upwards, and operated at 300 kHz frequency. Data of quality higher than 13 was read into Eiva Navimodel Producer and gridded at 1 m grid. The data fields are 
latitude (decimal degrees)
longitude (decimal degrees)
ice draft (m)

 
File CTD_PostProcessed.txt
Temperature, salinity and depth from a SBE49 CTD cast through a hot-water borehole at 74° 22' 12.5328" S, 112° 32' 26.2782" W (74.370062 S, 112.540718 W). A Seabird SBE49 (SN 0219) FastCAT CTD profiler was mounted on a purpose-built deployment frame and attached to a winch cable with a mechanical termination and an electrical termination for live data collection. A downward and upward cast of temperature and salinity with pressure was made at 14:46 UTC on 7 Feb 2022, sampling at a rate of 16 Hz. Data collection took about an hour each way. The CTD spent a couple of minutes at the seabed (1226 dB, recorded by an RBRsolo), which introduced artifacts in the salinity observations during the upcast. The data were filtered, aligned in time, and averaged into 0.05 m vertical bins using the Seabird processing routines version 7.26.7.129. No thermal mass corrections were applied. The data were calibrated with CTD data from the RV/IB Nathaniel B. Palmer and CTD data from the AUV, and conductivity was shifted by +0.015 mS/cm. The manufacturer-stated accuracy of the temperature and conductivity sensors are ±0.002 °C and ±0.0003 S m−1, respectively.
Data fields:
pressure (dB)
Conservative temperature (deg)
Absolute salinity (g/kg)


File dotson_cast_downcast.cnv
Raw data of the drill site CTD
Data fields:
Pressure (dB)
Conductivity (mS/cm)
Temperature (in situ, oC)
Scan (count)
Flag</r:Content>
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