Abstract:
The datasets are temperature time series from strings of thermistors, each located at a discrete depth within one of six boreholes into Khumbu Glacier, Nepal. Boreholes were drilled in May 2017 and 2018 to investigate the internal properties of Khumbu Glacier, specifically ice thickness, temperature, deformation and structure, as part of the NERC-funded 'EverDrill' research project. Supporting borehole information is provided as a related dataset. The data are presented in whole or in part in Miles et al. (2018).
Funding was provided by the NERC grant NE/P00265X/1 and NE/P002021/1.
Keywords:
Ice boreholes, Ice temperature, Khumbu Glacier, Nepal
Hubbard, B., Miles, K., Doyle, S., Quincey, D., & Miles, E. (2021). Ice temperature time-series from sensors installed in boreholes drilled into Khumbu Glacier, Nepal, in 2017 and 2018 as part of EverDrill research project - VERSION 2.0 (Version 2.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/32ecd5f4-1f00-4eeb-bd1e-5eaffb60f556
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2021-07-14 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Bryn Hubbard |
| Role(s) | Investigator, Technical Contact |
| Organisation | Aberystwyth University |
| Name | Katie Miles |
| Role(s) | Investigator |
| Organisation | Aberystwyth University |
| Name | Samuel Doyle |
| Role(s) | Investigator |
| Organisation | Aberystwyth University |
| Name | Duncan Quincey |
| Role(s) | Investigator |
| Organisation | University of Leeds |
| Name | Evan Miles |
| Role(s) | Investigator |
| Organisation | University of Leeds |
| Parent Dataset: | N/A |
| Reference: | Miles, K.E., Hubbard, B., Quincey, D.J., Miles, E.S., Sherpa, T.C., Rowan, A.V. and Doyle, S.H. (2018), Polythermal structure of a Himalayan debris-covered glacier revealed by borehole thermometry, Scientific Reports, 8, 16825. https://doi.org/10.1038/s41598-018-34327-5 Doyle, S.H., Hubbard, B., Christoffersen, P., Young, T.J., Hofsteded, C., Bougamont, M., Box, J.E., and Hubbard, A. (2018), Physical conditions of fast glacier flow: 1. Measurements from boreholes drilled to the bed of Store Glacier, West Greenland, Journal of Geophysical Research: Earth Surface, 123, https://doi.org/10.1002/2017JF004529 Miles, K.E., Miles, E.S., Hubbard, B., Quincey, D.J., Rowan, A.V. and Pallett, M. (2019), Instruments and methods: hot-water borehole drilling at a high-elevation debris-covered glacier, Journal of Glaciology, 65, 253, pp.882-832 https://doi.org/10.1017/jog.2019.49 Miles, K.E., Hubbard, B., Quincey, D.J., Miles, E.S. and Rowan, A.V. (in review), Seasonal cold-wave propagation into the near-surface ice of debris-covered Khumbu Glacier, Nepal, Frontiers in Earth Science |
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| Quality: | Detailed methodology, including accuracy estimation, is presented by Miles et al. (2018). Boreholes were drilled, and sensors installed, in April-May 2017 and 2018. Each thermistor typically logged temperature every 10 minutes for the time periods evident from each data record. For the three 2017 instrumented boreholes, this logging interval was changed to hourly measurements in May 2018. |
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| Lineage: | The datasets are temperature time series recorded by thermistors mounted on strings installed into six boreholes drilled into Khumbu Glacier, Nepal. The data are presented in whole or in part in Miles et al. (2018). For borehole information, see the related datasets. | |
| Temporal Coverage: | |
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| Start Date | 2017-05-10 |
| End Date | 2019-10-20 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | 27.94 |
| Northernmost | 27.99 |
| Longitude | |
| Westernmost | 86.16 |
| Easternmost | 86.85 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Nepal |
| Detailed Location | Khumbu Glacier, Himalaya |
| Sensor(s): |
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| Data Collection: | Temperatures were acquired by using Honeywell UNI-curve 192-502-LET-AOI negative temperature coefficient thermistors, controlled by Campbell Scientific CR1000 data loggers from the glacier surface. Details are provided in Miles et al. (2018). Resolution: The thermistors have an interchangeability of 0.4 degrees Celsius. After an ice bath calibration, previous studies have suggested that an accuracy of +/- 0.05 degrees can be achieved around 0 degrees. This is therefore the expected accuracy at 0 degrees, but represents an indication of uncertainty rather than a maximum limit (particularly as temperatures diverge away from 0 degrees). See Doyle et al. (2018) and Miles et al. (2018) for more information. |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 23.1 MB |
| Distribution Format | ASCII |
| Fees | N/A |
| Data Storage: | The data are structured in six comma-separated ASCII files (*.csv format), one for each borehole thermistor string. Each file holds the data for a single borehole, with each column presenting a different thermistor (labelled by depth from the glacier surface, in metres; see Instrumented Borehole Info), and each row the date and time at which the temperature was recorded. Temperatures are in degrees Celsius, with extreme negative readings (< ~ -15 degC) indicating missing or erroneous data (from cable breaking). Inadequate settling times in the programmes for thermistors at Site 4 produced inaccurate readings for likely all thermistors on the "Site 4 long" string, and the lowermost five thermistors on the "Site 4 short" string. |