Ringel, Maximilian Harald; Spreen, Gunnar; Huntemann, Marcus (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]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995758 (DOI registration in progress)
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Published: 2026-07-28
Abstract:
The data consists of 158 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. All images contain melt pond surfaces and are taken in nadir view (0° incidence angle). See the referenced cruise report for details of the used measurement set-up. 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. For some of the images there are co-located under-pond sea ice thickness measurements which are published in another dataset on PANGAEA (doi not available yet). The images here and the referenced sea ice thickness measurements can be linked using the site names given in the location_unified parameter. These site names are used throughout all publications related to CONTRASTS cruise melt pond observations. For each image there is another site name under location_original which refers to the site names which were chosen in the field and used in the O2A registry. Further hyperspectral images taken during the PS149 CONTRASTS expedition, which have been taken along short transects with an incidence angle of about 40-50°, are available in a separate dataset.
Keyword(s):
Supplement to:
Ringel, Maximilian Harald; et al. (in prep.): The observed dependence of melt pond reflectance and colour on under-pond sea ice thickness.
Related to:
Bühler, Linnu; Rückert, Janna Elisabeth; Walbröl, Andreas; Mech, Mario; Krobot, Pavel; Ebell, Kerstin; Schnitt, Sabrina; Spreen, Gunnar (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]. PANGAEA, https://doi.org/10.1594/PANGAEA.990497
Nicolaus, Marcel (2026): The Expedition PS149 of the Research Vessel POLARSTERN to the Arctic Ocean in 2025. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 808, 382 pp, https://doi.org/10.57738/BZPM_0808_2026
Ringel, Maximilian Harald; Spreen, Gunnar; Huntemann, Marcus (2026): Hyperspectral camera raw data (SPECIM_IQ_01) during the RV Polarstern PS149 CONTRASTS cruise (July-August 2025) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.995759 (same kind of hyperspectral images taken during the same expedition but using a different method and covering different surface kinds)
Project(s):
Arctic Amplification (AC3)
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS149_01: Sea Ice Physics (CONTRASTS)
German Research Foundation (DFG), grant/award no. 268020496: TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Coverage:
Median Latitude: 83.586808 * Median Longitude: 9.960332 * South-bound Latitude: 82.458685 * West-bound Longitude: -17.895232 * North-bound Latitude: 84.717712 * East-bound Longitude: 34.082174
Date/Time Start: 2025-07-09T13:23:00 * Date/Time End: 2025-08-26T15:47:44
Minimum Elevation: -4073.9 m * Maximum Elevation: -3011.6 m
Event(s):
PS149_13-1 (Ice Station 1a) * Latitude Start: 83.804469 * Longitude Start: 20.753587 * Latitude End: 83.856951 * Longitude End: 24.252349 * Date/Time Start: 2025-07-09T06:32:22 * Date/Time End: 2025-07-12T18:25:00 * Elevation Start: -4073.9 m * Elevation End: -4071.5 m * O2A Registry URI: https://registry.o2a-data.de/items/8891 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: # Ice Station 1a; Sea ice 1.4m thick on Gangway
PS149_16-1 (Ice Station 2a) * Latitude Start: 85.022741 * Longitude Start: 13.512829 * Latitude End: 84.686618 * Longitude End: 13.944513 * Date/Time Start: 2025-07-14T12:36:36 * Date/Time End: 2025-07-17T17:58:01 * Elevation Start: -3065.2 m * Elevation End: -3612.9 m * O2A Registry URI: https://registry.o2a-data.de/items/8891 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: # Ice station 2a
PS149_18-1 (Ice Station 3a) * Latitude Start: 84.482009 * Longitude Start: -17.876229 * Latitude End: 84.349051 * Longitude End: -17.886025 * Date/Time Start: 2025-07-19T17:45:41 * Date/Time End: 2025-07-22T18:00:00 * Elevation Start: -3392.7 m * Elevation End: -3407.1 m * O2A Registry URI: https://registry.o2a-data.de/items/8891 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: # Ice Station 3a
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Ringel, Maximilian Harald | |||
| 2 | DATE/TIME | Date/Time | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | Geocode | |
| 3 | LATITUDE | Latitude | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | Geocode | |
| 4 | LONGITUDE | Longitude | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | Geocode | |
| 5 | Identification | ID | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | filename of the corresponding hyperspectral image taken by the SpecimIQ camera. | |
| 6 | Image | IMAGE | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | raw image files provided as tar.gz; missing rows: images unusable (overexposed), not included in published dataset | |
| 7 | Image (File Size) | IMAGE (Size) | Bytes | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | raw image files provided as tar.gz; missing rows: images unusable (overexposed), not included in published dataset |
| 8 | Ice floe description | Floe descr | Ringel, Maximilian Harald | 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. | ||
| 9 | Location | Location | Ringel, Maximilian Harald | 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. | ||
| 10 | Location | Location | Ringel, Maximilian Harald | unified name of the measurement location on the floe. These site names are used throughout all publications related to CONTRASTS melt pond observations. | ||
| 11 | Transect length | Transect l | m | Ringel, Maximilian Harald | Tape measure | distance along the transect. |
| 12 | Azimuth | Azim | deg | Ringel, Maximilian Harald | Anglemeter | angle of the camera's viewing direction relative to the sun azimuthal angle. |
| 13 | Camera height | Cam height | m | Ringel, Maximilian Harald | Ruler stick (RULER) | height of the hyperspectral camera above melt pond water surface. |
| 14 | Light description | Light descr | Ringel, Maximilian Harald | light conditions during the image. | ||
| 15 | Comment | Comment | Ringel, Maximilian Harald |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1405 data points