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Bühler, Linnu; Walbröl, Andreas; Krobot, Pavel; Mech, Mario (2026): Total Sky Imager observations in the visual and infrared on Polarstern cruise PS149 and PS150 (CONTRASTS and EGC-Sources) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.996472

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Published: 2026-08-11 • DOI registered: 2026-09-09

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Abstract:
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.
Keyword(s):
Arctic; Atmosphere; clouds; Polarstern; PS149; PS150
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
Further details:
Kanzow, Torsten (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, PANGAEA, https://doi.org/10.1594/PANGAEA.987833 (For lat/long information)
Kanzow, Torsten (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, PANGAEA, https://doi.org/10.1594/PANGAEA.987832 (For lat/long information)
Nicolaus, Marcel (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, PANGAEA, https://doi.org/10.1594/PANGAEA.987132 (For lat/long information)
Nicolaus, Marcel (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, PANGAEA, https://doi.org/10.1594/PANGAEA.987133 (For lat/long information)
Project(s):
Arctic Amplification (AC3)
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS149_07: VAMPIRE-2
German Research Foundation (DFG), grant/award no. 268020496: TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Coverage:
Median Latitude: 80.488796 * Median Longitude: 12.661945 * South-bound Latitude: 77.401275 * West-bound Longitude: 4.568338 * North-bound Latitude: 83.987198 * East-bound Longitude: 24.085292
Date/Time Start: 2025-07-04T00:00:00 * Date/Time End: 2025-10-17T23:59:00
Minimum Elevation: -2049.4 m * Maximum Elevation: -277.3 m
Event(s):
PS149_0_Underway-25-total_sky_imager-01 * Latitude: 77.401275 * Longitude: 11.545769 * Date/Time: 2025-07-04T08:10:00 * O2A Registry URI: https://registry.o2a-data.de/items/11611 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Total sky imager, visual and infrared (TSI) * Comment: Not logged in DShip. 1/60 Hz observations
PS149_0_Underway-25-total_sky_imager-03 * Latitude: 83.850909 * Longitude: 24.085292 * Date/Time: 2025-07-12T16:52:00 * O2A Registry URI: https://registry.o2a-data.de/items/11611 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Total sky imager, visual and infrared (TSI) * Comment: Not logged in DShip. connection repaired and operation continued
PS149_0_Underway-25-total_sky_imager-04 * Latitude: 83.987198 * Longitude: 10.003602 * Date/Time: 2025-08-20T10:21:00 * O2A Registry URI: https://registry.o2a-data.de/items/11611 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Total sky imager, visual and infrared (TSI) * Comment: Not logged in DShip. dried connector and resumed measurements
Comment:
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.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 DATE/TIMEDate/TimeBühler, LinnuGeocode – start
2 DATE/TIMEDate/TimeBühler, LinnuGeocode – end
3 Image, skyIMAGE skyBühler, LinnuTotal sky imager, visual and infrared (TSI)
4 Image, sky (File Size)IMAGE sky (Size)BytesBühler, LinnuTotal sky imager, visual and infrared (TSI)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
104 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

All files referred to in data matrix can be downloaded in one go as ZIP or TAR. Be careful: This download can be very large! To protect our systems from misuse, we require to sign up for an user account before downloading.

1 
Date/Time
(start)		2 
Date/Time
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IMAGE sky		4 
IMAGE sky (Size) [Bytes]
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