10.1594/PANGAEA.995175Jäkel, EvelynEvelynJäkelLeipzig Institute for Meteorology, University of LeipzigKlingebiel, MarcusMarcusKlingebiel0000-0002-1544-6668Leipzig Institute for Meteorology, University of LeipzigMüller, JoshuaJoshuaMüller0000-0001-6584-2581Leipzig Institute for Meteorology, University of LeipzigPANGAEA2026ArcticArctic surfacecloudsPolar 5radiancesEvent labelOptional event labelDate/Time of eventnetCDF filenetCDF file (File Size)AircraftAlbedometer, Spectral Modular Airborne Radiation measurement sysTem, SMART [0.3 to 2.2 μm]P5-256_COMPEX-EC_2025POLAR 5Arctic Amplification (AC3)2025-04-04T10:39:47/2025-04-15T15:46:27Dataset10.1594/PANGAEA.9831877 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalDuring the COMPEX-EC campaign performed in April 2025 spectral upward radiances were measured in the Norwegian Sea area using the Spectral Modular Airborne Radiation measurement sysTem (SMART-Albedometer). The data set provides solar spectra (400 - 900 nm) along the flight tracks of seven flights performed by the Polar 5 aircraft in 2 Hz resolution. The nadir-looking radiance inlet has an approximate field of view of 2°.20.32712920.32796967.82164567.822004German Research Foundationhttps://doi.org/10.13039/501100001659268020496TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms