Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X Institute of Environmental Physics, University of Bremen IUP https://ror.org/04ers2y35 Spreen Gunnar gunnar.spreen@uni-bremen.de https://seaice.uni-bremen.de/gunnar-spreen/ 0000-0003-0165-8448 Institute of Environmental Physics, University of Bremen IUP https://ror.org/04ers2y35 Huntemann Marcus marcus.huntemann@uni-bremen.de Institute of Environmental Physics, University of Bremen IUP https://ror.org/04ers2y35 2026 Hyperspectral camera raw data (SPECIM_IQ_01) during the RV Polarstern PS149 CONTRASTS cruise (July-August 2025) dataset https://doi.org/10.1594/PANGAEA.995759 2026-07-10T09:50:25 The data consists of 146 hyperspectral images 512x512 pixels in 204 bands in the wavengths range between 400 – 1000 nm with 2.5 nm step, obtained with the SPECIM IQ hyperspectral camera. The images contain bare ice, snow and melt pond surfaces and are taken with an incidence angle of about 40-50°. See the referenced cruise report for details of the used measurement set-up. The images have been either taken along straight transects along measurement tapes in regular distances of 20 meters or at specific locations at which other co-located measurements have been conducted. For the latter ones the images have been taken with an incidence angles of 0° and labeled with _coord in their location names. The data are raw data in the original SPECIM IQ format. Each data record is a folder (compressed as one file) readable by the Specim IQ software, which is downloadable free of charge from the manufacturer (Specim) after registration. Within the field of view of each scene, there is a white reference plate, which can be used for image calibration to obtain the hemispheric-directional surface reflectances. Out-of-focus white reference still can be used for calibration as the spectral properties are not affected. We provide some additional parameters to each image if available. Further hyperspectral images taken during the PS149 CONTRASTS expedition, which only cover melt pond surfaces using a 0° incidence angle, are available in a seperate dataset. 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 2026 The Expedition PS149 of the Research Vessel POLARSTERN to the Arctic Ocean in 2025 report Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research 808 https://doi.org/10.57738/BZPM_0808_2026 382 pp Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X Spreen Gunnar gunnar.spreen@uni-bremen.de https://seaice.uni-bremen.de/gunnar-spreen/ 0000-0003-0165-8448 Huntemann Marcus marcus.huntemann@uni-bremen.de 2026 Hyperspectral camera raw data (SPECIM_IQ_01) of nadir melt pond images taken during the RV Polarstern PS149 CONTRASTS cruise (July-August 2025) dataset https://doi.pangaea.de/10.1594/PANGAEA.995758 -17.88583951 83.75642467 82.43030105 84.81243652 10.555165618904116 83.66993671890411 2025-07-12T09:11:17 2025-08-27T09:23:31 -4073.9 -3011.6 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_01 Sea Ice Physics (CONTRASTS) 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_13-1 Ice Station 1a 83.804469 20.753587 -4073.9 2025-07-09T06:32:22 83.856951 24.252349 -4071.5 2025-07-12T18:25:00 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 1a; Sea ice 1.4m thick on Gangway PS149_16-1 Ice Station 2a 85.022741 13.512829 -3065.2 2025-07-14T12:36:36 84.686618 13.944513 -3612.9 2025-07-17T17:58:01 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice station 2a PS149_18-1 Ice Station 3a 84.482009 -17.876229 -3392.7 2025-07-19T17:45:41 84.349051 -17.886025 -3407.1 2025-07-22T18:00:00 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 3a PS149_21-1 Ice Station 1b 82.700972 27.118502 -3972.5 2025-07-25T16:30:00 82.489715 28.417981 -3832.2 2025-07-28T16:40:09 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 1b PS149_25-1 Ice Station 2b 83.757456 15.809045 -3939.7 2025-07-30T07:00:05 83.73587 18.99135 -4072.5 2025-08-01T17:31:26 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 2b PS149_30-1 Ice Station 3b 83.585557 -12.566417 -3922.9 2025-08-04T07:28:09 83.718564 -11.01244 -3947.7 2025-08-06T19:30:46 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 3b; Sea ice thickness: 1.70m and 2.00m PS149_32-1 Ice Station 1c 83.303888 33.637523 -3885.5 2025-08-09T08:00:12 83.326878 34.147091 -3872.4 2025-08-10T22:07:56 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 1c PS149_36-1 Ice Station 2c 84.473666 22.171544 -4061.7 2025-08-12T06:52:05 84.612758 21.574675 -4059.8 2025-08-14T17:22:33 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 2c; Min. ice thickness: 1.50m to 1.60m; end date/time missing PS149_41-1 Ice Station 3c 83.079482 -12.947867 -3407.7 2025-08-16T19:55:00 82.720678 -12.852788 -3011.6 2025-08-18T22:30:07 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 3c; Min. ice thickness 1.5m PS149_46-1 Ice Station 2d 84.201298 18.14983 -4059.8 2025-08-23T06:51:59 84.213073 17.324578 -3910.0 2025-08-24T18:32:02 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 2d PS149_47-1 Ice Station 3d 82.424062 -6.163415 -3268.2 2025-08-26T07:10:51 82.33896 -4.657221 -3502.6 2025-08-27T20:15:46 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 Ice station ICE https://registry.o2a-data.de/items/8891 # Ice Station 3d; Min. ice thickness: 1.60m - 1.80m 1241 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Event label Event Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X Event DATE/TIME Date/Time http://en.wikipedia.org/wiki/ISO_8601 Time T http://dbpedia.org/resource/Time Hyperspectral camera Specim IQ Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X Date/Time (Hyperspectral camera Specim IQ) LATITUDE Latitude http://en.wikipedia.org/wiki/ISO_6709 Hyperspectral camera Specim IQ Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X Latitude (Hyperspectral camera Specim IQ) LONGITUDE Longitude http://en.wikipedia.org/wiki/ISO_6709 Hyperspectral camera Specim IQ Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X Longitude (Hyperspectral camera Specim IQ) Identification ID Hyperspectral camera Specim IQ Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X filename of the corresponding hyperspectral image taken by the SpecimIQ camera. ID (filename of the corresponding...) Image IMAGE Hyperspectral camera Specim IQ Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X IMAGE (Hyperspectral camera Specim IQ) Image (File Size) IMAGE (Size) Bytes Hyperspectral camera Specim IQ Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X IMAGE (Size) [Bytes] (Hyperspectral camera Specim IQ) Ice floe description Floe descr Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X digit is giving the number of the floe, the letter the visit. For example, "2b" means it is the second visit of floe 2. See cruise report for more details. Floe descr (digit is giving the number of...) Location Location location Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X original name of the measurement location on the floe. These site names were chosen in the field and used in the O2A registry before the locations_unified have been defined. Location (original name of the measurem...) Location Location location Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X unified name of the measurement location on the floe. These site names are used throughout all publications related to CONTRASTS melt pond observations. Location (unified name of the measureme...) Transect length Transect l m Length L http://dbpedia.org/resource/Length Tape measure Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X distance along the transect. Transect l [m] (distance along the transect.,...) Azimuth Azim deg https://en.wikipedia.org/wiki/Azimuth Angle http://dbpedia.org/resource/Angle Plane Angle http://dbpedia.org/resource/Plane_angle Anglemeter Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X angle of the camera's viewing direction relative to the sun azimuthal angle. Azim [deg] (angle of the camera's viewing...) Camera height Cam height m Ruler stick RULER Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X height of the hyperspectral camera abvoe melt pond water surface. Cam height [m] (height of the hyperspectral c...) Light description Light descr light Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X light conditions during the image. Light descr (light conditions during the i...) Comment Comment Ringel Maximilian Harald mringel@uni-bremen.de 0000-0002-0600-135X Comment CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable Arctic Arctic Ocean CONTRASTS CONTRASTS expedition Hyperspectral data hyperspectral imaging hyperspectral reflectance melt ponds Polarstern Sea ice author100716 author113712 author118204 author30475 author52094 author55080 author64870 author66402 author82002 author87451 author98800 award17 award4219 basis1 campaign3395020 campaign51147 curlevel30 event3306306 event3306324 event3306339 event3306355 event3306383 event3306413 event3306431 event3306459 event3306497 event3306545 event3306554 funder20472 funder32 geocode1599 geocode1600 geocode1601 geocode8128 inst20386 inst21208 journal16572 license21 method11166 method12101 method14058 method19354 method4760 param100745 param150836 param1570 param1720 param4916 param501990 param522819 param565708 param7056 pi118204 project4230 ref139667 refds990497 refds995758 term2663525 term2663532 term37889 term40892 term43765 term43863 term43915 term43975 term47389 term47738 term47741 term48346 term49830 term50200 term69356 term77467 term77535 term77946