DOI: 10.18739/a2251fm5r
title: Atmospheric Surface Flux Station #50 measurements (Level 2 Complete), Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC), central Arctic, October 2019 - September 2020.

description: Processed (Level 2) measurements and derive parameters from the Atmospheric Surface Flux Station #50 (ASFS50) deployed at various locations during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition drifting with the central Arctic sea ice from October 2019 through September 2020. The ASFS measured all variables of the surface energy budget, air-ice momentum flux, near-surface meteorology, and local position. Measurements high-resolution 3-dimensional winds were observed at a nominal height of 4-m. Measurements of upwelling broadband radiation and meteorology observed from a nominal height of 2-m. The measurements are included in three netCDF files per day. The “1min” mosmet files are comprised of 1-min averages of measured and derived variables, including near-surface meteorology, surface skin temperature, snow depth, radiative fluxes, and position. The “10min” mosseb files are 10-min averages of the same variables as in the 1-min files and also include calculations of turbulent sensible and latent heat fluxes, momentum flux, and associated diagnostics, surface stress, and Monin-Obukhov parameters using both eddy covariance and bulk methodologies, all valid for the 10-min intervals. Both of these file types also contain a “_qc” variable paired with each measurement variable, or family of variables, that is a temporally-matched quality control code: 0 = good data, 1 = caution (data may be suspect), 2 = bad data, 3 = engineering (data was collected for testing purposes and is unsuitable for scientific research), and -1 = missing (no data was collected). The “10hz” files include 3-dimensional winds and gas densities of water vapor and carbon dioxide that are quality-controlled, aggregated to a regular 10-Hz temporal grid, and (for winds) rotated into the earth coordinate frame. A detailed documentation of the measurement conditions, the processing steps taken to construct this data set, and other caveats and uncertainties are provided in an accompanying published data manuscript (Cox et al. 2023). For the scientific purposes of most users, we recommend use of the Level 3 data files, as these include only the best estimates of essential climate variables. Level 2 data is useful for those that want enhanced turbulence diagnostics parameters and/or to consider the use of some data that has been flagged as unsuitable for research. These data were obtained via a collaboration among the University of Colorado, NOAA Physical Sciences Laboratory, and the NOAA Global Ocean Monitoring and Observing (GOMO) program. Cox, C.J., M. Gallagher, M.D. Shupe, P.O.G. Persson, A. Solomon, C. W. Fairall, T. Ayers, B. Blomquist, I. Brooks, D. Costa, A. Grachev, D. Gottas, J. Hutchings, M. Kutchenreiter, J. Leach, S.M. Morris, V. Morris, J. Osborn, S. Pezoa, A. Preusser, L. Riihimaki, and T. Uttal (2023): Continuous observations of the surface energy budget and meteorology over Arctic sea ice during MOSAiC. To be submitted, Nature Scientific Data.