Risse, Nils; Walbröl, Andreas; Bühler, Linnu; Rückert, Janna Elisabeth; Krobot, Pavel: Thermal-infrared brightness temperatures of the surface from the FLIR A315 camera during Polarstern cruise PS144 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.994065 (dataset in review)
Abstract:
This data set contains daily files of thermal-infrared brightness temperature (TB) statistics for each frame and each video recorded with the FLIR A315 camera during Polarstern cruise PS144 (Rabe & Geibert, 2025). The videos were recorded with 1 frame/second between 10 August and 5 October 2024. The TB statistics files (PS144_flir_tb_statistics_*.nc) include the mean, standard deviation, minimum and maximum TB of each frame (image), the TB in the centre of the image as well as the count of TBs within TB bins for the full image. For enhanced spatial context, daily mp4 videos of minutely FLIR images (PS144_flir_tb_*.mp4) were compiled including the time stamp of the image in UTC and a colour bar indicating the range of the brightness temperature. Note that not all video players are able to play the mp4 files as we have chosen a lossless video codec (libx264rbg, crf 0). We recommend using the VLC media player to play the mp4 files.
We additionally provide a file to correct biases of the FLIR recordings (PS144_flir_tb_offset_correction.nc) using in-situ surface temperature measurements in the footprint of the FLIR camera on the sea ice. We assumed an emissivity of the snow/surface scattering layer of 0.985 (0.996) before (after) fresh snow had fallen onto the sea ice. The emissivity assumptions are based on Thielke et al. (2022), Nalliet al. (2023) and Cox et al. (2023). The contribution of the reflected atmospheric contribution is generally low because of the high emissivity value but not negligible. We assumed reflected atmospheric TBs of 273.15 K in overcast, 205 K in clear-sky and 239.075 K in broken-sky conditions. The clear-sky value is taken from the subarctic summer values given in Smith and Tuomi (2008). The file also contains an uncertainty estimate of the bias correction as well as the in-situ temperatures and FLIR TBs used to determine the bias.
Related to:
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
References:
Cox, Christopher J; Gallagher, Michael R; Shupe, Matthew D; Persson, P Ola G; Solomon, Amy; Fairall, Christopher W; Ayers, Thomas; Blomquist, Byron; Brooks, Ian M; Costa, Dave; Grachev, Andrey A; Gottas, Daniel; Hutchings, Jennifer K; Kutchenreiter, Mark; Leach, Jesse; Morris, Sara M; Morris, Victor; Osborn, Jackson; Pezoa, Sergio; Preußer, Andreas; Riihimaki, Laura; Uttal, Taneil (2023): Continuous observations of the surface energy budget and meteorology over the Arctic sea ice during MOSAiC. Scientific Data, 10(1), 519, https://doi.org/10.1038/s41597-023-02415-5
Nalli, Nicholas R; Dang, Cheng; Jung, James A; Knuteson, Robert O; Borbas, E Eva; Johnson, Benjamin T; Pryor, Ken; Zhou, Lihang (2023): Physically Based Thermal Infrared Snow/Ice Surface Emissivity for Fast Radiative Transfer Models. Remote Sensing, 15(23), 5509, https://doi.org/10.3390/rs15235509
Rabe, Benjamin; Geibert, Walter (2025): The Expedition PS144 of the Research Vessel POLARSTERN to the Arctic Ocean in 2023 /2024. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 794, 312 pp, https://doi.org/10.57738/BZPM_0794_2025
Smith, Stephen; Toumi, Ralf (2008): Measuring Cloud Cover and Brightness Temperature with a Ground-Based Thermal Infrared Camera. Journal of Applied Meteorology and Climatology, 47(2), 683-693, https://doi.org/10.1175/2007JAMC1615.1
Thielke, Linda; Huntemann, Marcus; Hendricks, Stefan; Jutila, Arttu; Ricker, Robert; Spreen, Gunnar (2022): Sea ice surface temperatures from helicopter-borne thermal infrared imaging during the MOSAiC expedition. Scientific Data, 9(1), 364, https://doi.org/10.1038/s41597-022-01461-9
Further details:
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
Project(s):
Arctic Amplification (AC3)
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS144_06: SeaIcePhys. (ArcWatch1/TransArc3)
German Research Foundation (DFG), grant/award no. 268020496: TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Coverage:
Median Latitude: 75.326124 * Median Longitude: 24.756526 * South-bound Latitude: 69.747320 * West-bound Longitude: 19.142440 * North-bound Latitude: 80.904929 * East-bound Longitude: 30.370613
Date/Time Start: 2024-08-10T00:00:00 * Date/Time End: 2024-10-05T00:00:00
Minimum Elevation: -118.1 m * Maximum Elevation: -11.9 m
Event(s):
PS144_0_Underway-15 * Latitude Start: 69.747320 * Longitude Start: 19.142440 * Latitude End: 80.904929 * Longitude End: 30.370613 * Date/Time Start: 2024-08-09T08:00:00 * Date/Time End: 2024-10-05T08:45:00 * Elevation Start: -11.9 m * Elevation End: -118.1 m * O2A Registry URI: https://registry.o2a-data.de/items/12049 * Campaign: PS144 (ArcWatch 2; TransArc3) * Basis: Polarstern * Method/Device: Infrared camera (IR_CAM)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Risse, Nils | Geocode | ||
| 2 | Video | VIDEO | Risse, Nils | Infrared camera, FLIR, A315 | ||
| 3 | Video (File Size) | VIDEO (Size) | Bytes | Risse, Nils | Infrared camera, FLIR, A315 | |
| 4 | netCDF file | netCDF | Risse, Nils | Infrared camera, FLIR, A315 | ||
| 5 | netCDF file (File Size) | netCDF (Size) | Bytes | Risse, Nils | Infrared camera, FLIR, A315 |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
115 data points