Description: Sea ice buoy lightharp was deployed at the MOSAiC LM-site from mid January to August 2022. It measured autonomously and non-destructively the up- and downwelling light field in the ice. This dataset contains the raw data of buoy lightharp as it was received onshore via satellite link. Further information on the data format and the measurement record are collected in the attached protocol documents.

Description: During the MOSAIC expedition, we deployed in-ice light measuring buoys, lightharp, and lightchains into the ice to investigate light partitioning and irradiance at different layers and depths in sea ice. The dataset presented here contains processed data from both instrument systems, containing derived optical properties, PAR data, and auxiliary data for each deployment site. Auxiliary data gives information on the position, snow, and ice thickness statistics, and surface melt that changes the relative vertical position of the measurements. Auxiliary data was retrieved from SIMBA buoys deployed in the vicinity of the optical instruments. All data are provided in NetCDF format. The dataset includes processed data from the lightharp and three light chains (one redeployed on Leg5) from MOSAiC. The instruments were deployed at four different sites during MOSAiC: LM site (SYI dark coring site), L3 site, Pond site on Leg5 and within the Central Observatory (CO). The first part of the filenames reflects the deployment site. The second part gives the buoy name to which the optical sensors were connected and the last part the measurement period in YYMMDD. The NetCDF files were compiled using the profile_trajectory standard from CF conventions. Multiple directly measured and derived data layers are included with data coordinates depth and nominal_date. Nominal_date is the time of the uppermost valid measurement of a profile. Furthermore, files contain a set of already published auxiliary data describing the snow- and ice thickness statistics at the measurement sites (mean, max, min, and std) and a proxy for surface melt, that changes the vertical position of the frozen-in sensors. The lightharp data furthermore contains snow thickness from SIMBA buoy T62 and an individual surface melt approximation derived with temperature measurements at the optical sensors and surface melt rates. Data PIs and further helpful information is included in the attributes.

Description: Sea ice buoy saltharp was deployed at the MOSAiC LM-site from mid January to August 2022. It measured autonomously and non-destructively the temperature and conductivity between horizontal wire pairs, from which we retrieve solid fraction and sea ice bulk salinity profiles. This dataset contains the raw data of saltharp as it was received onshore via satellite link. The saltharp had severe technical problems, making most of the data unusable. A processed data set will exclude these values. Definitely wrong ones have already been replaced here with -999. as NaN indicator. Further information on the data format and the measurement record are collected in the attached protocol documents.