Atmospheric Surface Flux Station #40 measurements (Level 1 Raw), Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC), central Arctic, October 2019 - September 2020

Raw (Level 1) measurements from the Atmospheric Surface Flux Station #40 (ASFS40) deployed at a remote, uncrewed sampling site 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 parameters of the surface energy budget, surface momentum flux, near-surface meteorology, and local position. These measurements are included in two netCDF files per day. The "slow" files are for 1-minute averages of measured variables, including near-surface meteorology, surface height change, upwelling and downwelling shortwave and longwave radiative fluxes, net surface heat flux, and position. The "fast" files are for data at 20-Hertz (Hz) resolution including 3-dimensional wind, temperature, and gas concentrations of water vapor and carbon dioxide. These data are raw measurements with technical corrections applied but no quality assurance. Moreover, the data files contain all measurements, including data collected during system testing that are not intended for scientific use. A detailed documentation of the measurement conditions will be provided in a forthcoming data publication. For scientific purposes, we recommend using Level 3 data files when they are available, as these will include full quality control as well as higher-order derived products.