Transmission of spectral solar irradiance through sea ice measured at different water depths during Polarstern expedition PS131


Measurements of transmitted irradiance under sea ice and corresponding incident solar radiation at the surface have been performed during the Polarstern expedition PS131, ATWAICE. During this expedition, three major ice floes were revisited to repeat measurements with a time gap of approximately one week and thereby analyze temporal development. Additionally, measurements on another ice floe were repeated 8 times within one day to observe the daily cycle of incoming and transmitted irradiance. All observations took place in the Fram Strait, north of Svalbard, between July 13 and August 6, 2022. The radiation measurements have been performed with Ramses spectral radiometers (TriOS, Rastede, Germany) in the wavelength range 316 to 952 nm. The incoming irradiance sensor was installed at approximately 1 m above the sea ice surface. The transmittance sensor was lowered through a hole (diameter about 10 cm) into the water down to 40 to 50 m depth. There are three datasets, two of them contain the raw data of the incoming and transmittance sensors. The third file contains temporally interpolated data (to 1s) of integrated intensity of both sensors and an estimation of the transmittance which is the ratio of the incoming and the transmitted irradiance. All times are given in UTC. The "incoming" dataset contains the date and time as index, the integration time of the sensor in ms and the measured intensity per channel in mW/m²/nm. The "transmitted" dataset contains the same information for the sensor in the water complemented with the sensor depth in meters and its inclination in two directions in degree (°). The "interpolated" dataset contains again the date and time, sensor depth and inclination information, and the integration times of the two sensors complemented with the integrated intensity measured by the two sensors in W/m² and their ratio which is the transmittance in percent (%). Additionally included, are plots of the sensor depth-transmittance relation for all 19 observations and the ice thickness and ice draft measured at the measurement site. Two figures show the measurement setup.

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Creator Niehaus, Hannah ORCID logo; Buth, Lena; Haas, Christian ORCID logo; Lion, Victor; Neudert, Mara; Rückert, Janna Elisabeth ORCID logo; Spreen, Gunnar ORCID logo; Walbröl, Andreas ORCID logo; Nicolaus, Marcel ORCID logo
Publisher PANGAEA
Publication Year 2023
Funding Reference Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven Crossref Funder ID AWI_PS131_02 Ice; Federal Ministry of Education and Research Crossref Funder ID 03F0866A MOSAiC 1 - IceSense: Fernerkundung der saisonalen Entwicklung klimarelevanter Meereis-Eigenschaften; Leitantrag; Vorhaben: Saisonale Veränderungen von Eisdicken und Schmelztümpeln; Federal Ministry of Education and Research Crossref Funder ID 03F0866B MOSAiC 1 - IceSense: Fernerkundung der saisonalen Entwicklung klimarelevanter Meereis-Eigenschaften; Vorhaben: Zeitliche Veränderung von Mikrowellenemissivität und Meereiskonzentration, - typ und Schneedicke; German Research Foundation Crossref Funder ID 268020496 TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Resource Type Bundled Publication of Datasets; Collection
Format application/zip
Size 3 datasets
Discipline Earth System Research
Spatial Coverage (-18.439W, 78.435S, 8.101E, 81.609N)
Temporal Coverage Begin 2022-07-13T13:05:15Z
Temporal Coverage End 2022-08-06T09:30:34Z