Snow height on sea ice, meteorological conditions and drift of sea ice from autonomous measurements from buoy 2020S98, deployed during MOSAiC 2019/20

• Main Authors: Nicolaus, Marcel, Hoppmann, Mario, Regnery, Julia
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2021
• Subjects: autonomous platform; buoy; drift; snow depth; DATE/TIME; LATITUDE; LONGITUDE; Snow height; Pressure, atmospheric; Temperature, air; Temperature, technical; Global positioning system, time since last fix; Quality flag, snow height; Quality flag, atmospheric pressure; Quality flag, air temperature; Quality flag, technical temperature; Quality flag, position; Snow buoy; PS122/5; Polarstern; Current sea ice maps for Arctic and Antarctic meereisportal.de; Multidisciplinary drifting Observatory for the Study of Arctic Climate MOSAiC; Multidisciplinary Ice-based Distributed Observatory MIDO; Sea Ice Physics @ AWI AWI_SeaIce; Arctic; Antarctic; Arctic Ocean; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.937173; https://doi.pangaea.de/10.1594/PANGAEA.937173

Snow height was measured by the Snow Buoy 2020S98, an autonomous platform, installed on drifting sea ice in the Arctic Ocean during MOSAiC (Leg 5) 2019/20. The resulting time series describes the evolution of snow height as a function of place and time between 17 September 2020 and 01 July 2021 in sample intervals of 1 hour. The Snow Buoy consists of four independent acoustic range finder measurements representing the area (approx. 10 m**2) around the buoy. In addition to snow height, geographic position (GPS), barometric pressure, air temperature, and surface temperature were measured. Negative values of snow height occur if surface ablation continues into the sea ice. Thus, these measurements describe the position of the sea ice surface relative to the original snow-ice interface. Differences between single sensors indicate small-scale variability of the snow pack around the buoy. : The data set has been processed and contains quality flags for different kinds for erroneous data. Flag values are the sum of individual error codes. The value of 0 refers to no error. Quality flag, position: The geographic position is flagged +1 if the drift velocity, as derived from the GPS longitude and latitude, exceeds a threshold of 10 deg latitude or 50 deg longitude per time step; +2 if the position exceeds extreme values, such as longitude > 360 deg; +4 if the position is exactly 0.0. Quality flag, snow: The snow height is flagged for each sensor +1 for manual corrections during processing (e.g. sensor issues); +2 if the snow accumulation exceeds 0.1 m per hour; +4 if the difference in snow height is larger than 0.03 m compared to values within the last and next 2 hours; +32 if the value exceeds the height of sensor on the platform at 1.5 m. Quality flag, temperature: The air temperature is flagged +1 for manual corrections during processing (e.g. sensor issues); + 32 if the value is below – 50 °C.Quality flag, pressure: The barometric pressure is flagged +1 for manual corrections during processing (e.g. sensor issues).