Citation:

PANGAEA.933584

Name: GEM-2 combined snow and ice thickness during a floe-scale walk on station PS81/506_GPS1
Published: 2021-07-12
License: https://creativecommons.org/licenses/by/4.0/
Keywords: ice thickness; Sea ice; snow depth; spatial variability

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Abstract:

Combined snow and ice thickness from a multifrequency electromagnetic induction instrument (GEM-2), see Hunkeler et al. (2015) for details.

Keyword(s):

ice thickness; Sea ice; snow depth; spatial variability

Related to:

Wever, Nander; Leonard, Katherine C; Maksym, Ted; White, Seth; Proksch, Martin; Lenaerts, Jan T M (2021): Spatially distributed simulations of the effect of snow on mass balance and flooding of Antarctic sea ice. Journal of Glaciology, 67(266), 1055-1073, https://doi.org/10.1017/jog.2021.54

Further details:

Hunkeler, Priska A; Hendricks, Stefan; Hoppmann, Mario; Farquharson, Colin G; Kalscheuer, Thomas; Grab, Melchior; Kaufmann, Manuela S; Rabenstein, Lasse; Gerdes, Rüdiger (2016): Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking. Geophysics, 81(1), WA45-WA58, https://doi.org/10.1190/geo2015-0130.1

Funding:

National Science Foundation (NSF), grant/award no. OPP-1142075 : Role of Snow Distribution Processes in Antarctic Sea Ice Mass Balance

National Science Foundation (NSF), grant/award no. OPP-1341513 : Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica

Swiss National Science Foundation (SNF), grant/award no. 142684 : Antarctic precipitation, snow accumulation processes, and ice-ocean interactions

Swiss National Science Foundation (SNF), grant/award no. 172299 : Spatial variability of snow on sea ice: where does it originate from and how does it impact the sea ice mass balance?

Coverage:

Latitude: -67.196890 * Longitude: -23.156920

Date/Time Start: 2013-07-12T20:00:00 * Date/Time End: 2013-07-12T20:00:00

Event(s):

PS81/506_GPS1 * Latitude: -67.196890 * Longitude: -23.156920 * Date/Time: 2013-07-12T20:00:00 * Campaign: (PS81 AWECS) * Basis: * Method/Device: Global positioning system (GPS) * Comment: Starting point of measurement; UTM Zone 27S, northing=2545052, easting=406729

Comment:

Coordinates:

============

X and Y coordinates are relative to a GPS base station installed on each floe. Coordinates were determined using post-processing kinematic GPS (PPK-GPS), and corrected for floe ration and drift. Coordinates of measurements inside the laser scanning area were particularly carefully processed to collocate measurements as accurately as possible (within a few cm). The vertical height above sea level in the TLS data was determined by using reflectors on poles. Upon installation of these reflector poles, the ice was drilled through and the height of the reflector above sea level was determined. For details, see Wever et al. (2021).

On the floe scale walk, magnaprobe coordinates have been equally processed as in the laser scanning area. However, for the GEM-2 instrument, the position of the magnaprobe was taken for the corresponding time stamp in the GEM-2 data. Since the GEM-2 instrument was following the Magnaprobe surveyor with a few m distance, this leads to less precise positioning. However, the GEM-2 instrument also has a footprint of similar order of magnitude (see Hunkeler et al., 2015).

Coordinate reference points:

============================

All coordinates are relative to GPS base station 1, in a local coordinate system where X and Y coordinates align with easting and northing, respectively, from the respective UTM Zone at a specific point in time. The respective coordinates of GPS base station 1 for this dataset are:

For PS81/506: Location of GPS base station 1, July 12 2013, 2000 UTC:

WGS84 : latitude=-67.19689 longitude=-23.15692

UTM Zone 27S : northing=2545052 easting=406729

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Cartesian coordinate, x	x	m	Wever, Nander		relative to GPS1 starting position
2	Cartesian coordinate, y	y	m	Wever, Nander		relative to GPS1 starting position
3	Sea ice and snow thickness	Sea ice+snow thick	m	Wever, Nander	Ground-based Electromagnetic Induction Sounding Device, GEM-2

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 1 (ProcLevel1)

Size:

22080 data points

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