Abstract:
Ground-penetrating radar (GPR) was used to test glacier ice thickness/glacier bed detectability on debris-covered Himalayan glaciers at a range of frequencies in glacier long- and cross- profiles and at static points. The survey sites were of the Lirung and Langtang Glaciers in the Langtang National Park, Nepal, where debris cover thickness varied from centimetres to several metres. The radar used was the BAS DELORES dipole pulse radar system, operating at 5MHz, 10MHz, 20MHZ and 40MHz. Data were acquired as a stop-go survey at 2-4m intervals on partially snow-covered and entirely debris-covered glacier surfaces in temperatures close to freezing, with a diurnal freeze-thaw cycle.
Funding was provided by the NERC grant NE/L013258/1.
Keywords:
Glacier, Himalayas, Ice thickness, Nepal, Radar
Pritchard, H. (2017). Ground-penetrating radar data from Lirung and Langtang Glaciers, Nepal, 2015 (Version "1.0") [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/b14057b1-1951-45a0-a055-7d0d17102263
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2016-11-02 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Hamish D Pritchard |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | McCARTHY, M., PRITCHARD, H., WILLIS, I., & KING, E. (2017). Ground-penetrating radar measurements of debris thickness on Lirung Glacier, Nepal. Journal of Glaciology, 63(239), 543-555. doi:10.1017/jog.2017.18 | |
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| Lineage: | See field report for details. | |
| Temporal Coverage: | |
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| Start Date | 2015-03-21 |
| End Date | 2015-04-14 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | 28.23 |
| Northernmost | 28.25 |
| Longitude | |
| Westernmost | 85.55 |
| Easternmost | 85.71 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Nepal |
| Detailed Location | Lirung and Langtang Glaciers |
| Sensor(s): |
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| Source(s): |
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| Data Storage: | The dataset is approximately 300 MB in .rtf and .tdms formats. Filenames: lang denotes Langtang Glacier, lir denotes Lirung Glacier. The next 4 or 5 characters denote the date (e.g. 1apr is 1st April 2015). _static_ denotes a static test where only frequency was changed. _10m_ etc. denotes length of half-dipole (i.e. 10m indicates a total dipole length of 20 m). _lnX_ (where X is a number) denotes a glacier cross-line profile. _longlnX_ denotes a glacier long-line profile. stackY (where Y is a number) denotes the number of shots averaged in each stack (e.g. 500). amp or unamp denotes whether an amplifier was used. File formats: .rtf files are rich-text format screenshots for certain acquisitions showing system settings and plots of single-shot radar amplitude with time. The .tdms files are the main data files in National Instruments TDMS format (see http://www.ni.com/white-paper/3727/en/) (for processing in e.g. ReflexW, these can be converted into ASCII matrix format). |
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