Full Record - Campaign GNSS results on rocky outcrops west of former Larsen B ice shelf, 2014-2015

Campaign GNSS results on rocky outcrops west of former Larsen B ice shelf, 2014-2015

GB/NERC/BAS/PDC/01379

Abstract:
During the 2014/2015 season six temporary GNSS stations were deployed on rocky outcrops west of the former Larsen B ice shelf by the University of Leeds and BAS, in the region of the Flask and Leppard Glaciers. This was carried out as part of the NERC funded UKANET project. This is an area we have targeted with a space-based technique called radar interferometry (InSAR), which can provide dense measurements of uplift rates, and the temporary GNSS network were deployed to better understand the contribution of atmospheric noise to the InSAR results. Four were taken out in the same season, while the other two were pulled in the 2015/2016 season.

Funding was provided by NERC grant NE/L006065/1.

Citation:
Hooper, A., & Palamartchouk, K. (2020). Campaign GNSS results on rocky outcrops west of former Larsen B ice shelf, 2014-2015 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/afd20113-bfa6-46ee-9116-2bb1ec9408ed

Access Data

GET DATA

https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=afd20113-bfa6-46ee-9116-2bb1ec9408ed

PROJECT HOME PAGE

https://ukanet.wixsite.com/ukanet

License

Use:	This data is supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

Authors

Name	UK PDC
Role(s)	Metadata Author
Organisation	British Antarctic Survey

Name	Andrew Hooper
Role(s)	Investigator, Technical Contact
Organisation	University of Leeds

Name	Kirill Palamartchouk
Role(s)	Investigator
Organisation	Newcastle University

Basic Information

Creation Date:	2020-09-23
Dataset Progress:	Complete
Dataset Language:	English
ISO Topic Categories:	Climatology/Meteorology/Atmosphere Geoscientific Information Imagery/Base Maps/Earth Cover
Parameters:	Cryosphere > Glaciers/Ice Sheets Cryosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation Cryosphere > Glaciers/Ice Sheets > Glacier Mass Balance/Ice Sheet Mass Balance Hydrosphere > Glaciers/Ice Sheets Hydrosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation Hydrosphere > Glaciers/Ice Sheets > Glacier Mass Balance/Ice Sheet Mass Balance

Additional Information

Quality:	High quality for the most part, but missing data towards end of the time series for UKA3 and UKA4, when batteries reached a low charge. Uncertainties are included in the data files.
Lineage/Methodology:	GPS and GLONASS Data were gathered using Leica GS10 receivers and Leica AS10 antennas connected to a car battery with a solar panel attached. The antennas were fixed on 30cm masts screwed onto a cemented pin. The sample rate was set to 15s. The instruments ran until power ran out due to lack of insolation during winter. The GPS data only were processed using the NASA JPL GPS- Inferred Positioning System (GIPSY) software.

Extent

Temporal Coverage:
Start Date	2014-11-19
End Date	2015-06-06

Spatial Coverage:
Latitude
Southernmost	-66.03053
Northernmost	-65.51639
Longitude
Westernmost	-63.0359
Easternmost	-62.49864
Altitude
Min Altitude	395 m
Max Altitude	859 m
Depth
Min Depth	N/A
Max Depth	N/A

Location:
Location	Antarctica
Detailed Location	Oscar II Coast region in the region of the Flask and Leppard Glaciers

Data Collection:	Leica GS10 receivers and Leica AS10 antennas

Storage

Distribution:
Distribution Media	Online Internet (HTTP)
Distribution Size	320.4 MB
Distribution Format	ASCII
Fees	N/A

Data Storage:	timeseries/${SITE}.{lon,lat,rad} files contain the daily coordinate time series of each of the sites in local coordinates. Meaning of the columns: (1) decimal year (2) value in cm. Other files are session-specific and are named starting with ${SITE}.${YEAR}.${DOY} (DOY -- day of year). Each session was meant to start in 21:00 on the previous day and end in 03:00 on the following day (in GPS time), but this depends on data coverage. The "stacov" files store the geocentric (XYZ in meters) coordinates in ITRF2008 per daily session. XYZ are in the lines with "STA X", "STA Y", "STA Z" lines. The uncertainties follow the "+-" sign and are formal sigmas, too optimistic to be realistic. The tdp (Time-Dependent parameters) files contain the tropospheric aprioris and estimates. We first take the apriori values of the zenith tropospheric delay separately due to the dry atmosphere and water vapour from ECMWF weather model, linearly interpolated in time, and then estimate the wet component from the data. Therefore the total delay is the sum of the apriori dry and estimated wet values from TDP files. Aprioris and estimates are in the separate directories. The format is the same for all TDP files: (1) time in seconds passed since 12:00 GPS time on 1 January 2000 (2) disregard (3) the value of the delay in meters (4) formal uncertainty (5) parameter ID. The parameter ID is of the form "WETZTROPSITE" for wet and "DRYZTROPSITE" for dry delay. In order to get the total delay, the wet estimates should be added to the dry aprioris. The wet delays around midnight appear in the overlapping sessions from the consecutive days and the disagreements between them can be used to quantify the quality of the solutions.

Discovery Metadata System