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Rückert, Janna Elisabeth; Spreen, Gunnar; Huntemann, Marcus; Niehaus, Hannah; Walbröl, Andreas (2024): Surface brightness temperature images measured by an infrared camera installed on RV POLARSTERN during expedition PS131 (ATWAICE) (June - August 2022, Fram Strait/East Greenland) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.967576

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Abstract:
During the Polarstern cruise PS131 infrared (IR) brightness temperatures of the surface (open ocean and sea ice) were recorded from onboard the vessel with a down-looking infrared camera (Infrared VarioCAM HDx head camera from InfraTec) that was installed on starboard on the upper deck (at around 21.5 m from sea level ('Peildeck')). The viewing angle (off-nadir) was around 70° and the camera has a field of view of 57.1° × 44.4°. Each image has a size of 640 × 480 IR pixels. The images are stored as netCDF files where one file includes data from one day. For each image, latitude and longitude information are included. They are obtained from the mastertrack of the ship (doi:10.1594/PANGAEA.950999). In addition the dataset contains the viewing angle for each image obtained from an auxiliary inertial measurement unit (IMU) installed on the IR camera that was resampled to 2 seconds. Missing data of the IMU was filled by the average of the existing angle measurements of the respective day or, if that was not available, by a fill-value of 70°.
The IR camera was operated in conjunction with a visual camera, pointing at the same target.
The IR camera data was recording one image every 10 minutes from 3 July - 10 July. From 10 July, 16:00 UTC, the cameras was operated with a sampling rate of 0.2 Hz, taking a picture every 5 s. Data is missing on 24 July from 7:09-19:22 and on 7 August from 17:16-21:20 when the recording was stopped.
The images contain open ocean as well as sea ice in the eastern Fram Strait, the marginal ice zone in Fram Strait, during the transit to the Aurora vent field (high ice concentration) and near East Greenland (fast ice).
Keyword(s):
Arctic; brightness temperature; infrared imagery; marginal ice zone; ocean temperature; PS131; Sea ice
Supplement to:
Rückert, Janna Elisabeth; Walbröl, Andreas; Risse, Nicolai; Krobot, Pavel; Haseneder-Lind, R; Mech, Mario; Ebell, Kerstin; Spreen, Gunnar (accepted): Measuring microwave sea ice and ocean brightness temperature and emissivity between 22 and 243 GHz by ship-based radiometers with rotatable mirrors. Annals of Glaciology
References:
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (2017): Polar Research and Supply Vessel POLARSTERN operated by the Alfred-Wegener-Institute. Journal of large-scale research facilities JLSRF, 3, A119, https://doi.org/10.17815/jlsrf-3-163
Kanzow, Torsten (2023): The Expedition PS131 of the Research Vessel Polarstern to the Fram Strait in 2022. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 770, 320 pp, https://doi.org/10.57738/BzPM_0770_2023
Project(s):
Arctic Amplification (AC3)
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS131_11: WALSEMA
German Research Foundation (DFG), grant/award no. 268020496: TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Coverage:
Latitude: 53.567500 * Longitude: 8.554800
Date/Time Start: 2022-06-28T00:00:00 * Date/Time End: 2022-08-17T00:00:00
Event(s):
PS131-track * Latitude Start: 53.567500 * Longitude Start: 8.554800 * Latitude End: 53.567500 * Longitude End: 8.554800 * Date/Time Start: 2022-06-28T00:00:00 * Date/Time End: 2022-08-17T00:00:00 * Campaign: PS131 (ATWAICE) * Basis: Polarstern * Method/Device: Underway cruise track measurements (CT) * Comment: Bremerhaven - Bremerhaven
Comment:
The data files are netCDF files (one per day) with a time coordinate. The brightness temperature (IR) images (variable called temps) have the spatial dimensions of 480x640. In addition, the variables latitude, longitude and viewing_angle are included.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Binary ObjectBinaryRückert, Janna ElisabethInfrared head camera, InfraTec, VarioCAM HDx
2 Binary Object (File Size)Binary (Size)BytesRückert, Janna ElisabethInfrared head camera, InfraTec, VarioCAM HDx
3 Binary Object (Media Type)Binary (Type)Rückert, Janna ElisabethInfrared head camera, InfraTec, VarioCAM HDx
4 Binary Object (MD5 Hash)Binary (Hash)Rückert, Janna ElisabethInfrared head camera, InfraTec, VarioCAM HDx
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
35 data points

Data

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Binary		2 
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