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Nicolaus, Marcel; Hoppmann, Mario; Regnery, Julia (2021): Snow height on sea ice, meteorological conditions and drift of sea ice from autonomous measurements from buoy 2020S98, deployed during MOSAiC 2019/20. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.937173

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Abstract:
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.
Keyword(s):
autonomous platform; buoy; drift; snow depth
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AFMOSAiC-1_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS122_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate / MOSAiC
Coverage:
Median Latitude: 85.065274 * Median Longitude: 0.942388 * South-bound Latitude: 75.755400 * West-bound Longitude: -28.978200 * North-bound Latitude: 89.597200 * East-bound Longitude: 112.006600
Date/Time Start: 2020-09-17T06:00:00 * Date/Time End: 2021-07-01T03:03:00
Minimum Elevation: -4275.4 m * Maximum Elevation: -4275.4 m
Event(s):
PS122/5_58-104 (2020S98) * Latitude Start: 89.026496 * Longitude Start: 108.173869 * Latitude End: 76.294600 * Longitude End: -10.745200 * Date/Time Start: 2020-09-17T05:45:00 * Date/Time End: 2021-07-01T03:03:00 * Elevation: -4275.4 m * Sensor URI: Link * Location: Arctic Ocean * Campaign: PS122/5 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Snow buoy (BUOY_SNOW) * Comment: Deployed in meltpond within a ridge; surrounded by ice blocks up to 3m high; ice thickness ~8m;
Comment:
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).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimeNicolaus, MarcelGeocode
2LATITUDELatitudeNicolaus, MarcelGeocode
3LONGITUDELongitudeNicolaus, MarcelGeocode
4Snow heightSnow hmNicolaus, MarcelSensor 1
5Snow heightSnow hmNicolaus, MarcelSensor 2
6Snow heightSnow hmNicolaus, MarcelSensor 3
7Snow heightSnow hmNicolaus, MarcelSensor 4
8Pressure, atmosphericPPPPhPaNicolaus, Marcel
9Temperature, airTTT°CNicolaus, Marcel
10Temperature, technicalT tech°CNicolaus, MarcelEquipment body
11Global positioning system, time since last fixGPS TSLFminNicolaus, Marcel
12Quality flag, snow heightQF snow hNicolaus, MarcelSensor 1
13Quality flag, snow heightQF snow hNicolaus, MarcelSensor 2
14Quality flag, snow heightQF snow hNicolaus, MarcelSensor 3
15Quality flag, snow heightQF snow hNicolaus, MarcelSensor 4
16Quality flag, atmospheric pressureQF atmos pressNicolaus, Marcel
17Quality flag, air temperatureQF air tempNicolaus, Marcel
18Quality flag, technical temperatureQF T techNicolaus, MarcelEquipment body
19Quality flag, positionQF posNicolaus, Marcel
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 2 (ProcLevel2)
Size:
110176 data points

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