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27 results for “PolarFront”
PolarFront cruise 2023-08 ship logs from Helmer Hanssen
<p><strong>PolarFront 2023-08 ship logs</strong> </p><p>Original (ISO 8859-1 encoded) text files from the ship logger on Helmer Hanssen.</p>
Vertical hydrography profiles from CTD rosette downcasts during PolarFront cruise 2023-08
<p>PolarFront 2023-08 CTD profiles</p><p>Pressure, temperature, salinity, and other physical properties of seawater from 31 vertical profiles sampled during the PolarFront 2023-08 cruise. Only downcast values are used to avoid errors caused by turbulence on the upcast. Basic data processing were done using Sea-Bird Scientific software SBE Data Processing (v7.26): converting to physical units, filtering for outliers, and bin-averaging over 1 m bins. The final data accuracy is ±0.5 dbar for pressure, ±0.002˚C for sea water temperature and ±0.003 for sea water salinity.</p><p>Example final data `head -n3 stnr1085.xls`:</p><blockquote><p>scan: Scan Count depSM: Depth [salt water, m] prDM: Pressure, Digiquartz [db] t090C: Temperature [ITS-90, deg C] c0S/m: Conductivity [S/m] sal00: Salinity, Practical [PSU] sigma-t00: Density [sigma-t, kg/m^3 ] svCM: Sound Velocity [Chen-Millero, m/s] flSP: Fluorescence, Seapoint sbeox0PS: Oxygen, SBE 43 [% saturation] seaTurbMtr: Turbidity, Seapoint [FTU] par/sat/log: PAR/Logarithmic, Satlantic [umol photons/m^2/sec] sbeox0ML/L: Oxygen, SBE 43 [ml/l] depSM: Depth [salt water, m], lat = 74.9995 potemp090C: Potential Temperature [ITS-90, deg C] sal00: Salinity, Practical [PSU] sigma-é00: Density [sigma-theta, kg/m^3] svCM: Sound Velocity [Chen-Millero, m/s] oxsolML/L: Oxygen Saturation, Garcia & Gordon [ml/l] flag: flag 243 3.955 4.000 8.9775 3.708699 34.9575 27.0886 1486.13 7.9014e-01 105.842 1.003 2.0359e+01 6.8367 3.958 8.9771 34.9576 27.0886 1486.13 6.45936 0.0000e+00 327 4.945 5.000 8.9787 3.708880 34.9577 27.0885 1486.15 7.4764e-01 99.487 0.991 1.4706e+01 6.4261 4.948 8.9782 34.9578 27.0886 1486.15 6.45918 0.0000e+00</p></blockquote><p> File types</p><p>Each station number has multiple data files from various steps of processing: `ls stnr1085*`: </p><p>`stnr1085_bin.cnv stnr1085_bin.wmf stnr1085.bl stnr1085.btl stnr1085.btx stnr1085.cnv stnr1085.hdr stnr1085.hex stnr1085_RAW.cnv stnr1085.xls`</p><p>Notice that the *.xls are plain ascii text files with tab-separated values. These may be converted to utf-8 using `iconv -f iso8859-1 -t utf8`</p><ul><li>*.bl = Bottle log information. Output bottle file, containing bottle firing sequence number and position, data, time, and beginning and ending scan numbers for each bottle closure. Beginning and ending scan numbers correspond to approximately 1.5-second duration for each bottle.</li><li>*.btl = Bottle files. Averaged data for each bottle.</li><li>*.cnv = Data converted to engineering units.</li><li>*hdr = Header information.</li><li>.hex = Hexadecimal data file.</li><li>*.xls = Converted data binned to 1 m as ascii text (tsv).</li><li>*.xlmcon = Instrument configuration.</li><li>*_bin.cnv = Converted data binned to 1 m as ascii data.</li><li>*_bin.wmf = Graphic of converted and 1m-binned data. *_RAW.cnv = Raw data as text file.</li></ul>
Split-beam echosounder data from keel-mounted EK60 during PolarFront 2023-08 cruise
<p><strong>PolarFront 2023-08 EK60</strong></p><p>The keel-mounted Simrad EK60® split-beam echosounder continuously recorded hydroacoustic data at 18, 38, and 120 kHz. The ping rate was set to 1.5 seconds and pulse length to 1,024 µs. </p>
Ship logs from Helmer Hanssen on PolarFront cruise 2022-05
<p><strong>PolarFront 2022-05 ship logs</strong></p> <p>Original (ISO 8859-1 encoded) text files from the ship logger on Helmer Hanssen.</p> <p>See Daase ed., 2022 for further details on study area and for a list of named stations.</p> <p><strong>References</strong><br> Daase M (ed.) (2022). <a href="https://doi.org/10.5281/zenodo.7128746">PolarFront May 2022 Cruise Report</a>. Zenodo. https://doi.org/10.5281/zenodo.7128746</p>
Moving vessel profiler (MVP) transects from PolarFront 2022-05 cruise
<p><strong>MVP transects 2022-05</strong></p> <p><span>The Moving Vessel Profiler (MVP) was deployed to collect data with high-spatial resolution along transects aiming to cross the front. Instruments contained in the profiling unit ("fish") of the winch were a CTD (AML µCTD), a fluorescence sensor (WETLABS) and a laser optical plankton counter (LOPC). </span></p> <p><span>Together the instruments yield data on the physical environment, phytoplankton, zooplankton and other particle distributions.</span></p> <p><span>Weather conditions during the cruise allowed sampling along two transects (S1 and parts of S2). However, S1 did not cross the polar front due to too thick ice cover in the North. The south (waves to high) and north (ice) of transect S2 were sampled by a different platform, data elsewhere, together resulting in a complete transect crossing the front.</span></p> <p><span>Coverage</span></p> <p><span>Transect S1 start: 75 N, 29 30' E, 20 May at 06:57 UTC<br></span><span>Transect S1 end: 75 55' N, 29 54' E, 20 May at 16:16 UTC</span></p> <p><span>Transect S2 start: 75 24' N, 29 E, 23 May at 16:03 UTC<br></span><span>Transect S2 end: 76 43' N, 29 30' E, 24 May at 03:43 UTC</span></p> <p>S1: 2022-05-20T06:57Z/2022-05-20T06:57Z<br>S2: 2022-05-23T16:16Z/2022-05-24T03:43Z </p>
Split-beam echosounder data from keel-mounted EK60 during PolarFront 2022-05 cruise
<p>Cruise report:</p> <blockquote>Hull-mounted EK60 The keel-mounted Simrad EK60® split-beam echosounder continuously recorded hydroacoustic data at 18, 38, and 120 kHz. The ping rate was set to 1.5 seconds and pulse length to 1,024 µs. The echosounder was calibrated annually using the standard sphere method (Demer et al., 2015). A Seabird 911 Plus CTD® recorded temperature and conductivity regularly throughout the transects from which we could derive profiles of temperature and salinity, sound speed (Mackenzie, 1981), and the coefficient of absorption at each frequency (François and Garrison, 1982).</blockquote>
Wideband acoustic transceiver data from probe attached to rosette on PolarFront 2022-05 cruise
<p><strong>PolarFront 2022-05 WBAT/Rosette</strong></p> <p>Proprietary echosounder files and mission plan from Kongsberg Maritime WBT tranceiver EKA, serial number 253119.</p> <p>Time coverage: 2022-05-20T04:32:12Z/2022-05-25-T12:30:06Z</p> <p>Size: 2.8GiB</p> <blockquote> <p><strong>Acoustic probe (WBAT)</strong><br> At some stations we deployed an acoustic probe composed of a Wideband Acoustic<br> Transceiver (WBAT; Kongsberg Maritime AS) mounted on the LOPC rosette frame and connected to<br> a sideward-looking 38 kHz split beam transducer (Model ES38-18DK; 36-45 kHz) and a sideward-<br> looking 333 kHz single beam transducer (Model ES333-7CDK-single; 280-380 kHz), both operated in<br> broadband mode split-beam wideband (Figure 1c). The ping rate was set to 1 second, the range to 50<br> m, the pulse length to 2,048 µs, and power to 225 W at 38kHz and 38 W at 333 kHz. The WBAT was<br> calibrated in January 2022. The time of the WBAT was synchronized with the LOPC-CTD to extract<br> the exact depth at each ping.</p> </blockquote> <p>For a list of probe stations, see M Daase (ed., 2022, table 4.1, p. 32).</p> <p><strong>References</strong></p> <p>Malin Daase (ed.) (2022). <a href="https://doi.org/10.5281/zenodo.7128746">PolarFront May 2022 Cruise Report</a>. Zenodo. https://doi.org/10.5281/zenodo.7128746</p>
Sailbuoy Iskant PolarFront EK80 echosounder data [4/12] 2021-06-01 to 2021-06-05
<p>This dataset is part 4/12 of a collection and contains ~43.2 GB of data in 480 files, captured between 2021-06-01 and 2021-06-05.</p> <p>See <a href="10.5281/zenodo.7463346">Wideband acoustic EK80 transceiver datasets and GPS track of autonomous sailbuoy in the Barents Sea for the PolarFront project May to July 2021</a> for more information.</p>
Sailbuoy Iskant PolarFront EK80 echosounder data [6/12] 2021-06-11/2021-06-15
<p>This dataset is part 6/12 of a collection and contains ~43.2 GB of data in 480 files, captured between 2021-06-11 and 2021-06-15.</p> <p>See <a href="10.5281/zenodo.7463346">Wideband acoustic EK80 transceiver datasets and GPS track of autonomous sailbuoy in the Barents Sea for the PolarFront project May to July 2021</a> for more information.</p>
Moving vessel profiler (MVP) transect from PolarFront 2023-08 cruise
<p><span>The Moving Vessel Profiler (MVP) was deployed to collect data with high-spatial resolution along our </span><span>transect crossing the front. Instruments contained in the profiling unit ("fish") of the winch were a CTD </span><span>(AML µCTD), a fluorescence sensor (WETLABS) and a laser optical plankton counter (LOPC). </span></p> <p><span>Together the instruments yield data on the physical environment, phytoplankton, zooplankton and other </span><span>particle distributions</span></p> <p><span>During the entire deployment of the MVP, weather conditions were optimal with very low wind speeds </span><span>and calm sea. Apart from one stop at the surface due to a fishing vessel in our transect (20 min stop), </span><span>no sampling issues whatsoever were experienced. A few breaks along the transect were taken to collect </span><span>water samples and to set out the Sailbuoy and Seaglider.</span></p> <p><span>Transect start: 75N, 29 30' E, 17 August at 02:13 UTC</span></p> <p><span>Transect end: 78N, 29 30' E, 18 August at 11:09 UTC</span></p> <p><span>In total the transect was 333 km long and 382 profiles to 25 m above bottom were collected, resulting </span><span>in a spatial resolution of, on average, 1 profile every 870 m.</span></p>
Ship logs from Helmer Hanssen on PolarFront cruise 2024-01
<div> <p>See the Cruise Report (Daase 2024) for details.</p> <p>Daase, M. (2024). PolarFront January 2024 Cruise Report. Zenodo. <a href="https://doi.org/10.5281/zenodo.10623810" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10623810</a></p> </div>
Seawater velocities from ship acoustic Doppler current profiler during PolarFront 2022-05 cruise
<p>Seawater velocities captured by Ocean Surveyor ADCP, RD Instruments, were recorded (blanking distance 8 m, bottom track on) during our entire study from 18-26 May.</p>
LOPC (laser optical plankton counter) data captured during PolarFront 2024-01 cruise
<p>See the Cruise Report (Daase 2024) for details.</p> <p>Daase, M. (2024). PolarFront January 2024 Cruise Report. Zenodo. <a href="https://doi.org/10.5281/zenodo.10623810" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10623810</a></p>
Hydrography profiles from ship CTD captured during PolarFront cruise 2024-01
<p>See the Cruise Report (Daase 2024) for details.</p> <p>Daase, M. (2024). PolarFront January 2024 Cruise Report. Zenodo. <a href="https://doi.org/10.5281/zenodo.10623810" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10623810</a></p>
Hydrography from LOPC-attached CTD during PolarFront cruise 2024-01
<p>See the Cruise Report (Daase 2024) for details.</p> <p>Daase, M. (2024). PolarFront January 2024 Cruise Report. Zenodo. <a href="https://doi.org/10.5281/zenodo.10623810" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10623810</a></p>
Wideband acoustic transceiver data from probe attached to Frankenstein rosette during PolarFront 2024-01 cruise
<p>See the Cruise Report (Daase 2024) for details.</p> <p>Daase, M. (2024). PolarFront January 2024 Cruise Report. Zenodo. <a href="https://doi.org/10.5281/zenodo.10623810" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10623810</a></p>
Physical oceanography captured by PolarFront Seaglider SG644 in 2023-08
<p>Seaglider SG644 was deployed from 18 to 25 August, 2023 (for details, see the <a href="https://doi.org/10.5281/zenodo.10014336">Cruise Report</a> https://doi.org/10.5281/zenodo.10014336</p> <p>Sibling datasets from the same deployment:</p> <ul> <li><a href="https://doi.org/10.5281/zenodo.13946034">EK80</a>: https://doi.org/10.5281/zenodo.13946034</li> <li><a href="https://doi.org/10.5281/zenodo.10041063">UVP6</a>: https://doi.org/10.5281/zenodo.10041063</li> </ul>
Vertical hydrography profiles from CTD rosette downcasts during PolarFront cruise 2022-05
<p>Hydrography data from CTD (SBE911plus, Seabird Inc.) profiles. Rosette equipped with the following sensors:</p> <ul> <li>Conductivity</li> <li>Temperature</li> <li>Pressure</li> <li>Fluorometer</li> <li>Turbidity</li> <li>PAR</li> <li>Oxygen</li> </ul> <p>Update December 2024</p> <p>The salinity and temperature sensors were calibrated against another CTD from a moored instrument by Ragnheid Skogseth at UNIS, the University Centre in Svalbard. A relatively large drift in temperature was observed. To convert temperature (T) and salinity (S) to calibrated values apply the following equations to e.g. data from stnrxxxx_bin.cnv</p> <p>T_new = T_old + 0.12<br>S_new = 1.0115 * S_old – 0.5343</p> <p>The following is quoted verbatim from chapter 1 in the cruise report (Basedow, 2022):</p> <blockquote> <p>Hydrographic data were collected by a variety of sensors mounted on vertical profiling platforms, towed platforms and autonomous gliders. Combined, these platforms provided detailed information at stations, high-resolution measurements across the polar front, and longer-term measurements by the gliders. During the cruise, hydrographic measurements were taken at stations using the main rosette equipped with 12 5-L Niskin bottles, CTD-F, PAR and other sensors (Table 1.1) and using a smaller rosette frame equipped with CTD-F, LOPC, LISST and WBAT (Table 1.2, Fig. 1.1). Both platforms were deployed vertically until 5-10 m above the bottom for the main platform and down to 300 m for the platform with the LOPC, this rosette sampling three profiles at selected stations.</p> <p>In total 14 vertical profiles were sampled by the rosette with the water bottles (Table 1.1) at our 6 main stations (PF1 to PF6). Water samples for biological analyses were taken from selected depths and a bottom water samples was collected at each station for calibration of the conductivity sensor ashore. Water samples for chlorophyll a will be used to calibrate the fluorescence sensor. CTD data from this rosette were processed using the SBEDataProcessing-Win32 software. Only the values from the CTD downcast were used to avoid turbulence caused by the rosette on the upcast. The data were converted<br>to physical units, filtered for outliers and bin-averaged over 1 m bins. </p> </blockquote> <p><strong>References</strong></p> <p>Sünnje Basedow, Nicolas Gosset, Torkel Granaas, Eva Leu (2022). Hydrography. In: Malin Daase (ed.) (2022). PolarFront May 2022 Cruise Report. Zenodo. https://doi.org/10.5281/zenodo.7128746</p>
Sailbuoy Echo PolarFront EK80 echosounder datasets 2023-08 to 2023-09
<p><strong>Sailbuoy Echo PolarFront EK80 echosounder data 2023-08 to 2023-09</strong></p><p>The Echo was deployed on 18 August 2023 at 29.45E, 77.76N. For further details on deployment, sampling, and piloting, see Buschmann (2023).</p><p>Time coverage: 2023-08-18-T09:11:46Z/2023-09-22T03:17:15Z</p><p><strong>Datasets</strong></p><ol><li>2023-08-18/2023-08-23: <a href="https://doi.org/10.5281/zenodo.10036821">https://doi.org/10.5281/zenodo.10036821</a></li><li>2023-08-24/2023-08-26: <a href="https://doi.org/10.5281/zenodo.10036823">https://doi.org/10.5281/zenodo.10036823</a></li><li>2023-08-27/2023-09-03: <a href="https://doi.org/10.5281/zenodo.10036825">https://doi.org/10.5281/zenodo.10036825</a></li><li>2023-09-04/2023-09-14: <a href="https://doi.org/10.5281/zenodo.10036827">https://doi.org/10.5281/zenodo.10036827</a></li><li>2023-09-15/2023-09-22: <a href="https://doi.org/10.5281/zenodo.10036829">https://doi.org/10.5281/zenodo.10036829</a></li></ol><p><strong>References</strong><br>Akvaplan-niva (2023-10-01). <strong>Sailbuoy Echo PolarFront sensor data.</strong><br>Buschmann H (2023). Glider data sampling for Polar Front mission summer 2023. In: Daase, M. (2023). PolarFront August 2023 Cruise Report (1.0.0). Zenodo. <a href="https://zenodo.org/doi/10.5281/zenodo.10013660">10.5281/zenodo.10013660</a>.<br> </p>
EK80 from PolarFront seaglider SG644 2023-08-18/2023-08-25
<p>Seaglider SG644 was deployed from 18 to 25 August, 2023 (for details, see the <a href="https://doi.org/10.5281/zenodo.10014336">Cruise Report</a>: https://doi.org/10.5281/zenodo.10014336</p> <p>Sibling datasets from the same deployment:</p> <ul> <li><a href="https://doi.org/10.5281/zenodo.13947021">Physical oceanography</a>: https://doi.org/10.5281/zenodo.13947021</li> <li><a href="https://doi.org/10.5281/zenodo.10041063">UVP6</a>: https://doi.org/10.5281/zenodo.10041063</li> </ul>
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