Surface brightness temperature images measured by an infrared camera installed on RV POLARSTERN during expedition PS131 (ATWAICE) (June - August 2022, Fram Strait/East Greenland)

• Main Authors: Rückert, Janna Elisabeth, Spreen, Gunnar, Huntemann, Marcus, Niehaus, Hannah, Walbröl, Andreas
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: AC3; Arctic; Arctic Amplification; ATWAICE; Binary Object; Binary Object (File Size); Binary Object (MD5 Hash); Binary Object (Media Type); brightness temperature; CT; Infrared head camera; InfraTec; VarioCAM HDx; infrared imagery; marginal ice zone; ocean temperature; Polarstern; PS131; PS131-track; Sea ice; Underway cruise track measurements; Greenland; Annals of Glaciology; Berichte zur Polar- und Meeresforschung; East Greenland; Fram Strait; Polar Research; Reports on Polar and Marine Research
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.967576; https://doi.org/10.1594/PANGAEA.967576

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).