PANGAEA_995751 Total Sky Imager observations in the visual and infrared on Polarstern cruise PS144 (ArcWatch-2) Bühler, Linnu; Rückert, Janna Elisabeth; Risse, Nils; Krobot, Pavel; Mech, Mario Total Sky Imager observations in the visual and infrared on Polarstern cruise PS144 (ArcWatch-2) 2026-07-27 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.995751 Investigator Linnu Bühler l.buehler@uni-koeln.de Earth Science DATE/TIME Image, sky Image, sky (File Size) geoscientificInformation Arctic Atmosphere clouds Polarstern PS144 PS144_0_Underway-20 Total sky imager, visual and infrared Total sky imager, visual and infrared Polarstern 2024-08-13 2024-10-08 Complete 69.74732 71.131707 13.280451 19.14244 AC3 Arctic Amplification unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 57 data points text/tab-separated-values Bühler, Linnu; Rückert, Janna Elisabeth; Walbröl, Andreas; Mech, Mario; Risse, Nils; 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-1): remote sensing and in-situ measurements suite during POLARSTERN cruise PS144 (ArcWatch-2) [dataset bibliography]. PANGAEA, https://doi.org/10.1594/PANGAEA.990496 Rabe, Benjamin; Geibert, Walter (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, PANGAEA, https://doi.org/10.1594/PANGAEA.974028 (For lat/long information) Rabe, Benjamin; Geibert, Walter (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, PANGAEA, https://doi.org/10.1594/PANGAEA.974029 (For lat/long information)

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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.995751"!

http://en.wikipedia.org/wiki/ISO_8601 DATE/TIME https://doi.org/10.17815/jlsrf-3-163 Polarstern https://doi.pangaea.de/10.1594/PANGAEA.974028 Master track of POLARSTERN cruise PS144 in 1 sec resolution (zipped, 243 MB) https://doi.pangaea.de/10.1594/PANGAEA.974029 Master tracks in different resolutions of POLARSTERN cruise PS144, Tromsø - Bremerhaven, 2024-08-09 - 2024-10-13 https://doi.pangaea.de/10.1594/PANGAEA.990496 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) https://gepris.dfg.de/project/268020496 AC3 DIF 9.4 2026-07-27 2026-09-08