Bühler Linnu l.buehler@uni-koeln.de University of Cologne https://ror.org/00rcxh774 Rückert Janna Elisabeth janna.rueckert@uni-bremen.de 0000-0001-9885-6576 Institute of Environmental Physics, University of Bremen IUP https://ror.org/04ers2y35 Walbröl Andreas a.walbroel@uni-koeln.de 0000-0003-2603-2724 University of Cologne https://ror.org/00rcxh774 Krobot Pavel pkrobot@uni-koeln.de University of Cologne https://ror.org/00rcxh774 2026 Visual images of the surface taken by a camera installed on RV POLARSTERN during expedition PS149 (July - September 2025, CONTRASTS) dataset https://doi.org/10.1594/PANGAEA.995225 2026-06-17T11:28:26 During the Polarstern cruise PS149 from July 2025 to September 2025 in the Arctic Ocean, photos of the surface (open ocean and sea ice) were recorded from onboard the vessel with a down-looking camera (GoPro Hero 11 Black) that was installed on port side on the A-deck (at around 20 m above sea level). The viewing angle (off-nadir) was around 53°. Each image has a size of 1114 x 974 pixels. The camera was operated with a sampling rate of 0.5 Hz, taking a picture every 2 s. The visual camera was operated in conjunction with an infrared camera, pointing at the same target, in addition microwave radiometers measured the surface brightness temperatures of a small area within the camera image (these datasets are also part of the VAMPIRE-2 dataset bibliography https://doi.org/10.1594/PANGAEA.990497). The images are downscaled to reduce storage needs and stored as zipped JPG files where one zip file includes one image per minute from one hour. In addition, the images are projected to the ground (top view projection). For that, the ship railing visible in the lower right of each image is masked out, except for a 40 by 40 pixel area showing the white ship hull. This area may be taken as white reference (calibration target) by users who want to use, for example, calibrated brightness information. The projection to the ground uses the roll and tilt angles obtained from the hydrins measurements (available via dship at 1 Hz resolution) and the python package cameratransform with the following parameters: sensor size 6.47mm x 5.05mm and focallength_mm 3.8 mm. Finally the images are cropped to contain a smaller area in the center of the original image. These post-processed images are available in the original temporal resolution. Data is available starting 3 July, 11:06, until 28 August, 13:44. More than 1 hour of data is missing from 2025-07-03 15:17:26 to 2025-07-04 17:42:43, and from 2025-07-14 09:02:58 to 2025-07-15 08:43:10. Bühler Linnu l.buehler@uni-koeln.de Rückert Janna Elisabeth janna.rueckert@uni-bremen.de 0000-0001-9885-6576 Walbröl Andreas a.walbroel@uni-koeln.de 0000-0003-2603-2724 Mech Mario mario.mech@uni-koeln.de 0000-0001-6229-9616 Krobot Pavel pkrobot@uni-koeln.de Ebell Kerstin kebell@meteo.uni-koeln.de 0000-0002-0042-4968 Schnitt Sabrina s.schnitt@uni-koeln.de 0000-0002-3949-770X Spreen Gunnar gunnar.spreen@uni-bremen.de https://seaice.uni-bremen.de/gunnar-spreen/ 0000-0003-0165-8448 2026 Water vapor, mixed-phase clouds, precipitation and sea ice emissivity over the Central Arctic Ocean (VAMPIRE-2): remote sensing and in-situ measurements suite during POLARSTERN cruise PS149 (CONTRASTS) dataset bibliography https://doi.org/10.1594/PANGAEA.990497 Nicolaus Marcel marcel.nicolaus@awi.de https://www.awi.de/en/about-us/organisation/staff/single-view/marcel-nicolaus.html 0000-0003-0903-1746 2025 Master track of POLARSTERN cruise PS149 in 1 sec resolution (zipped, 221 MB) dataset Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven https://doi.org/10.1594/PANGAEA.987132 -10.085402 14.923443 78.25511 81.889001 2.4190205000000002 80.0720555 2025-07-03T11:00:00 2025-08-28T13:00:00 AC3 Arctic Amplification https://gepris.dfg.de/project/268020496 Leipzig Institute for Meteorology, University of Leipzig LIM http://www.uni-leipzig.de/~meteo/en/index.php https://ror.org/03s7gtk40 Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven AWI https://www.awi.de/ https://doi.org/10.13039/501100003207 AWI_PS149_07 VAMPIRE-2 German Research Foundation DFG http://www.dfg.de/en/ https://doi.org/10.13039/501100001659 268020496 TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms https://gepris.dfg.de/project/268020496 PS149_0_Underway-16-gopro_uoc-01 78.25511 14.923443 2025-07-04T17:44:00 81.889001 -10.085402 2025-08-28T13:42:00 PS149 PS149 CONTRASTS; ArcWatch 3 CONTRASTS; ArcWatch 3 Tromsø, Norway 2025-07-02T00:00:00 2025-07-02 Longyearbyen, Svalbard and Jan Mayen 2025-09-01T00:00:00 2025-09-01 Polarstern https://doi.org/10.17815/jlsrf-3-163 DBLK 8013132 Nicolaus, Marcel Nicolaus, Marcel doi:10.57738/bzpm_0808_2026 20250027 https://epic.awi.de/id/eprint/60162/ https://download.pangaea.de/reference/135889/attachments/PS149_nav.png doi:10.1594/PANGAEA.987133 Polarstern https://doi.org/10.17815/jlsrf-3-163 DBLK 8013132 Digital Camera, GoPro GOPRO cameras http://vocab.nerc.ac.uk/collection/L05/current/311/ https://registry.o2a-data.de/items/11620 Not logged in DShip. Time Lapse, 0.5 Hz 2503 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ DATE/TIME Date/Time http://en.wikipedia.org/wiki/ISO_8601 Time T http://dbpedia.org/resource/Time Bühler Linnu l.buehler@uni-koeln.de Date/Time Image IMAGE Digital Camera, GoPro GOPRO cameras http://vocab.nerc.ac.uk/collection/L05/current/311/ Bühler Linnu l.buehler@uni-koeln.de top view projection, zipped tiff files IMAGE (top view projection, zipped t...) Image (File Size) IMAGE (Size) Bytes Digital Camera, GoPro GOPRO cameras http://vocab.nerc.ac.uk/collection/L05/current/311/ Bühler Linnu l.buehler@uni-koeln.de top view projection, zipped tiff files IMAGE (Size) [Bytes] (top view projection, zipped t...) Image IMAGE Digital Camera, GoPro GOPRO cameras http://vocab.nerc.ac.uk/collection/L05/current/311/ Bühler Linnu l.buehler@uni-koeln.de one image per minute from one hour, zipped JPG files IMAGE (one image per minute from one...) Image (File Size) IMAGE (Size) Bytes Digital Camera, GoPro GOPRO cameras http://vocab.nerc.ac.uk/collection/L05/current/311/ Bühler Linnu l.buehler@uni-koeln.de one image per minute from one hour, zipped JPG files IMAGE (Size) [Bytes] (one image per minute from one...) CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable Arctic Arctic Ocean Camera observations RGB Sea ice author100716 author113712 author30475 author52094 author64870 author66402 author82002 author87451 author98800 award17 award4224 basis1 campaign3395020 campaign51147 curlevel30 event3329212 funder20472 funder32 geocode1599 geocode1600 geocode1601 inst20386 inst20654 inst21208 license21 method13314 param150836 pi113712 project4230 refds987132 refds990497 sourceinst32 term2299446 term37889 term40892 term43975 term47389 term48346 term54383 term72749 term77535