Updated solar radiation over and under sea ice during the ALERT2018 campaign (MAP Last Ice) in May 2018

• Main Authors: Anhaus, Philipp, Katlein, Christian, Nicolaus, Marcel
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Arctic; Nunavut; Canada; Lincoln Sea; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.930289; https://doi.org/10.1594/PANGAEA.930289

Measurements of solar radiation over and under sea ice have been performed on First-Year-Ice (FYI) during the ALERT2018 campaign (Multidisciplinary Arctic Program (MAP) - Last Ice) off Alert, Nunavut, Canada in the Lincoln Sea on 10, 12, and 22 May 2018. All radiation measurements have been performed with Ramses spectral radiometers (TriOS, Rastede, Germany). All data are given in full spectral resolution interpolated to 1.0 nm, and integrated over the entire wavelength range (broadband, total: 320 to 950 nm). Two sensors were mounted on a Remotely Operated Vehicle (ROV) and one radiometer was installed on the sea ice for surface reference measurements (solar irradiance). On the ROV, one irradiance sensor (cos-collector) for energy budget calculations and one radiance sensor (9° opening angle) to obtain high resolution spatial variability were installed. Along with the radiation measurements, ROV positions were obtained from acoustic LBL (Long Baseline)-positioning and all parameters of vehicle depth, distance to the ice and attitude recorded. All times are given in UTC. --- The update includes 1) post-processing of position 2) referencing of position to ROV hole in the ice 3) removal of radiation data obtained with pitch and role outside ± 10° 4) removal of radiation data obtained in the tent 5) manual removal of single noisy transmitted radiance and irradiance spectra occurred in the wavelength bands 320-330 nm, 500 nm, 660-700 nm, 750/800-950 nm 6) manual removal of single spectra from artificial light sources (e.g., LEDs) occurred on 10 May at wavelengths 440 nm, 442 nm, 443 nm, 446 nm, and 447 nm 7) Position and times at selected markers along a 100 m transect