Bühler Linnu l.buehler@uni-koeln.de University of Cologne https://ror.org/00rcxh774 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 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 PS149 and PS150 (CONTRASTS and EGC-Sources) dataset https://doi.org/10.1594/PANGAEA.996472 2026-08-11T09:34:26 A Total Sky Imager (TSI) camera recorded cloud cover in the visual and infrared during Polarstern cruises PS149 and PS150 from July to October 2025 in the Arctic Ocean. The TSI was mounted on the bow-facing reling of the Observation 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 continuously after 250912. The ship's crow's nest covers a large section of the fish-eye camera's field of view, and one of the ship's antenna is partially in the infrared camera's field of view over the whole time period. For the infrared images, only colored plots set on a fixed color scale from 310 to 400 with no physical meaning or unit could be saved. The pictures can be downloaded as daily zip files. Data are available from 25-07-04 08:07 to 25-10-17 08:13, with gaps at 2507090404 - 2507121651, 2508191151 - 2508201022, and 2508301547 - 2508301702. 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 Kanzow Torsten torsten.kanzow@awi.de https://www.awi.de/en/about-us/organisation/staff/single-view/torsten-kanzow.html 0000-0002-5786-3435 2025 Master track of POLARSTERN cruise PS150 in 1 sec resolution (zipped, 183 MB) dataset Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven https://doi.org/10.1594/PANGAEA.987833 Kanzow Torsten torsten.kanzow@awi.de https://www.awi.de/en/about-us/organisation/staff/single-view/torsten-kanzow.html 0000-0002-5786-3435 2025 Master tracks in different resolutions of POLARSTERN cruise PS150, Tromsø - Bremerhaven, 2025-09-04 - 2025-10-24 dataset Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven https://doi.org/10.1594/PANGAEA.987832 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 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 tracks in different resolutions of POLARSTERN cruise PS149, Tromsø - Longyearbyen, 2025-07-02 - 2025-09-01 dataset Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven https://doi.org/10.1594/PANGAEA.987133 4.568338 24.085292 77.401275 83.987198 12.661945200000002 80.4887964 2025-07-04T00:00:00 2025-10-17T23:59:00 -2049.4 -277.3 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-25-total_sky_imager-01 77.401275 11.545769 2025-07-04T08:10:00 PS149 CONTRASTS; ArcWatch 3 Tromsø, Norway 2025-07-02T00:00:00 Longyearbyen, Svalbard and Jan Mayen 2025-09-01T00:00:00 Polarstern https://doi.org/10.17815/jlsrf-3-163 DBLK 8013132 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 Total sky imager, visual and infrared TSI https://registry.o2a-data.de/items/11611 Not logged in DShip. 1/60 Hz observations PS149_0_Underway-25-total_sky_imager-03 83.850909 24.085292 2025-07-12T16:52:00 PS149 CONTRASTS; ArcWatch 3 Tromsø, Norway 2025-07-02T00:00:00 Longyearbyen, Svalbard and Jan Mayen 2025-09-01T00:00:00 Polarstern https://doi.org/10.17815/jlsrf-3-163 DBLK 8013132 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 Total sky imager, visual and infrared TSI https://registry.o2a-data.de/items/11611 Not logged in DShip. connection repaired and operation continued PS149_0_Underway-25-total_sky_imager-04 83.987198 10.003602 2025-08-20T10:21:00 PS149 CONTRASTS; ArcWatch 3 Tromsø, Norway 2025-07-02T00:00:00 Longyearbyen, Svalbard and Jan Mayen 2025-09-01T00:00:00 Polarstern https://doi.org/10.17815/jlsrf-3-163 DBLK 8013132 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 Total sky imager, visual and infrared TSI https://registry.o2a-data.de/items/11611 Not logged in DShip. dried connector and resumed measurements PS150_0_Underway-28 78.110354 13.106725 -277.3 2025-09-04T17:55:39 79.094246 4.568338 -2049.4 2025-10-17T09:35:37 PS150 EGC-Sources Tromsø, Norway 2025-09-04T00:00:00 Bremerhaven, Germany 2025-10-23T00:00:00 Polarstern https://doi.org/10.17815/jlsrf-3-163 DBLK 8013132 Kanzow, Torsten doi:10.57738/BZPM_0809_2026 20250028 https://epic.awi.de/id/eprint/60301/ https://download.pangaea.de/reference/136611/attachments/PS150_nav.png doi:10.1594/PANGAEA.987832 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 104 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ For usage of the infrared images, a mask needs to be applied for 2508251713 - 2508251816. After 250912, a time offset between the TSI internal and the external computer develops and gradually increases up to 50 minutes from 251016. Only infrared and occasional color-distorted visual images were taken on 2509130930-2509131110, 2509131738-2509131930, 2509170754-2509170907, 2509210353-2509210502, 2509210552-2509210707, 2509211237-2509211342, 2509211443-2509211659, 2509221604-2509221720, 2509231834-2509231935, 2509240347-2509240457, 2509240704-2509240808, 2509240920-2509241055, 2509241845-2509242012, 2509242131-2509242242, 2509250726-2509251141, 509251453-2509251831, 2509280152-2509280305, 2509281313-2509281417, 2509281558-2509281751, 2510101403-2510101542, 2510101655-2510101806, 2510101831-2510102011, 2510102252-2510110036, 2510110605-2510110747, 2510110925-2510111028, 2510111335-2510111513, 2510120056-2510120206, 2510120606-2510120717, 2510120911-2510121014, 2510140615-2510140741, 2510140741-2510141034, 2510141349-2510141659, 2510141817-2510142034, 2510142234-2510150157, 2510150429-2510150546, 2510151534-2510151638, 2510151650-2510152004, 2510160228-2510160345, 2510160724-2510160935, 2510161155-2510161419, 2510161719-2510161839, 2510161841-2510162021, 2510162200-2510162311. 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 IMAGE sky Image, sky (File Size) IMAGE sky (Size) Bytes Total sky imager, visual and infrared TSI Bühler Linnu l.buehler@uni-koeln.de IMAGE sky (Size) [Bytes] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable Arctic Atmosphere clouds Polarstern PS149 PS150 author100716 author113712 author30475 author31079 author52094 author64870 author66402 author82002 author87451 author98800 award17 award4224 basis1 campaign3382975 campaign3395020 campaign50361 campaign51147 curlevel30 event3307002 event3329237 event3329238 event3329239 funder20472 funder32 geocode1599 geocode1600 geocode1601 geocode8128 inst20386 inst20654 license21 method17357 param514708 pi113712 project4230 refds987132 refds987133 refds987832 refds987833 refds990497 sourceinst32 term22636 term37889 term40892 term43975 term47408 term47738 term47871 term77427 term77428 term77535