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 Risse Nils nils.risse@ecmwf.int 0000-0002-7267-9353 European Centre for Medium-Range Weather Forecasts ECMWF http://www.ecmwf.int https://ror.org/014w0fd65 Krobot Pavel pkrobot@uni-koeln.de University of Cologne https://ror.org/00rcxh774 Mech Mario mario.mech@uni-koeln.de 0000-0001-6229-9616 University of Cologne https://ror.org/00rcxh774 2026 Total Sky Imager observations in the visual and infrared on Polarstern cruise PS144 (ArcWatch-2) dataset https://doi.org/10.1594/PANGAEA.995751 2026-07-27T06:16:01 A Total Sky Imager (TSI) camera recorded cloud cover in the visual and infrared during Polarstern cruise PS144 from August to October 2024 in the central Arctic Ocean. The TSI was mounted on the port side reling of the A-Deck, where it recorded an image every minute. The setup consists of the Mobotix visual fish-eye sensor Mx-O-SMA-S-6D016-X with 180° angles in both directions, 3072 x 2048 pixels, focal length of 1.6 mm and an aperture of f/2.0, as well as the infrared sensor Mx-O-SMA-TS-R079. The infrared sensor operates in the IR range of 7.5 to 13.5 μm, with angles of 45° and 35° and 336 x 252 pixels. For temperatures below -40 °C, i.e., in clear sky conditions, the TSI did not take pictures. Only colored plots set on a fixed color scale from 310 to 400 with no physical meaning or unit could be saved. Before September 10, the TSI reverted back to manufacturer's settings without the fixed color scale after clear sky conditions and was later manually changed to the fixed color scale. The ship's crow's nest covers a large section of the fish-eye camera's field of view. The pictures can be downloaded as daily zip files. Data are available from August 13, 10:42 until October 8, 08:28. More than 1 hour of data are missing (due to clear sky conditions or instrument malfunction) from 2024-08-14 08:04 to 2024-08-14 18:50, 2024-09-14 12:39 to 2024-09-15 08:58 and 2024-09-20 23:30 to 2024-09-21 07:02. Only infrared images were recorded from 2024-08-19 03:21 to 2024-08-20 07:43, 2024-08-26 03:08 to 2024-08-26 06:52, 2024-09-02 03:45 to 2024-09-02 17:08, 2024-09-07 18:16 to 2024-09-08 06:44, and from 2024-09-08 08:34 to 2024-09-09 06:57. 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 Risse Nils nils.risse@ecmwf.int 0000-0002-7267-9353 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-1): remote sensing and in-situ measurements suite during POLARSTERN cruise PS144 (ArcWatch-2) dataset bibliography https://doi.org/10.1594/PANGAEA.990496 Rabe Benjamin Benjamin.Rabe@awi.de https://www.awi.de/en/about-us/organisation/staff/single-view/benjamin-rabe.html 0000-0001-5794-9856 Geibert Walter walter.geibert@awi.de http://www.awi.de/ueber-uns/organisation/mitarbeiter/walter-geibert.html 0000-0001-8646-2334 2024 Master track of POLARSTERN cruise PS144 in 1 sec resolution (zipped, 243 MB) dataset Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven https://doi.org/10.1594/PANGAEA.974028 Rabe Benjamin Benjamin.Rabe@awi.de https://www.awi.de/en/about-us/organisation/staff/single-view/benjamin-rabe.html 0000-0001-5794-9856 Geibert Walter walter.geibert@awi.de http://www.awi.de/ueber-uns/organisation/mitarbeiter/walter-geibert.html 0000-0001-8646-2334 2024 Master tracks in different resolutions of POLARSTERN cruise PS144, Tromsø - Bremerhaven, 2024-08-09 - 2024-10-13 dataset Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven https://doi.org/10.1594/PANGAEA.974029 13.280451 19.14244 69.74732 71.131707 16.2114455 70.4395135 2024-08-13T00:00:00 2024-10-08T23:59:00 -2217.4 -11.9 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_PS144_00 DWD, Northern Helicopter 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 PS144_0_Underway-20 69.74732 19.14244 -11.9 2024-08-09T08:00:00 71.131707 13.280451 -2217.4 2024-10-08T09:00:00 PS144 ArcWatch 2; TransArc3 Tromsø, Norway 2024-08-09T00:00:00 Bremerhaven, Germany 2024-10-13T00:00:00 Polarstern https://doi.org/10.17815/jlsrf-3-163 DBLK 8013132 Rabe, Benjamin Geibert, Walter doi:10.57738/BZPM_0794_2025 20240025 hdl:10013/epic.71ce670f-2775-418f-ab94-285ba86f9d2e https://www.awi.de/fileadmin/user_upload/MET/PolarsternExpeditionMaps/PS144.png doi:10.1594/PANGAEA.974029 Polarstern https://doi.org/10.17815/jlsrf-3-163 DBLK 8013132 Total sky imager, visual and infrared TSI https://registry.o2a-data.de/items/11611 57 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 start Date/Time (start) 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 end Date/Time (end) Image, sky IMAGE sky Total sky imager, visual and infrared TSI Bühler Linnu l.buehler@uni-koeln.de jpg files in a zipped folder IMAGE sky (jpg files in a zipped folder) Image, sky (File Size) IMAGE sky (Size) Bytes Total sky imager, visual and infrared TSI Bühler Linnu l.buehler@uni-koeln.de jpg files in a zipped folder IMAGE sky (Size) [Bytes] (jpg files in a zipped folder) CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable Arctic Atmosphere clouds Polarstern PS144 author100716 author10649 author113712 author35597 author52094 author64870 author66402 author82002 author82003 author87451 author98800 award17 award3474 basis1 campaign3375398 campaign49619 curlevel30 event3200466 funder20472 funder32 geocode1599 geocode1600 geocode1601 geocode8128 inst20267 inst20386 inst20654 inst21208 license21 method17357 param514708 pi113712 project4230 refds974028 refds974029 refds990496 sourceinst32 term22636 term37889 term40892 term43975 term47408 term47738 term47871 term76330