| Summary: | Data are available for download at http://arcticdata.io/data/10.18739/A2NC5SD71 These files are merged, 10 Hertz (Hz) measurements of 3 dimensional relative wind components (u,v,w) and mole fractions in dry air of carbon dioxide (ppm), methane (ppb), ozone (ppb) and dimethylsulfide (ppt). These are intended as raw files for computation of turbulent flux. The time lag between wind and gas measurements due to the long gas inlet has been corrected in this dataset (i.e. the gas concentration time series is time-shifted to synchronize the trace gas and vertical wind speed measurements). Files are provided in netCDF format with the standard CDF epoch timestamp (milliseconds since 01-Jan-1970 00:00Z) and year/month/day/hour/minute/seccond time vectors, to simplify date/time calculations. The wind coordinate system is ship-relative, where urel is the velocity toward the bow and vrel is the velocity to-port. The user may compute relative wind direction from urel and vrel to evaluate when the relative direction is appropriate for undisturbed turbulence measurements (usually +/- 120° or less from the ship heading).
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