eb1c141a-6313-43dd-a93c-86bcacd80203 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2021-07-14 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Basal probe time-series from sensors installed at the base of boreholes drilled into Khumbu Glacier, Nepal, in 2017 and 2018 as part of EverDrill research project - VERSION 2.0 2021-07-14 creation 2021-07-14 revision 2021-07-14 publication 2021-07-14 released 2.0 https://doi.org/10.5285/eb1c141a-6313-43dd-a93c-86bcacd80203 doi GB/NERC/BAS/PDC/01525 https://data.bas.ac.uk/ NE/P00265X/1 award NE/P002021/1 award Please cite this item as: Hubbard, B., Miles, K., Doyle, S., Quincey, D., & Miles, E. (2021). Basal probe time-series from sensors installed at the base of 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/eb1c141a-6313-43dd-a93c-86bcacd80203 The datasets are basal probe sensor time series measuring suspended sediment concentration, water pressure, electrical conductivity and temperature. Each sensor was 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. Funding was provided by the NERC grant NE/P00265X/1 and NE/P002021/1. No credit. completed Hubbard, Bryn Aberystwyth University Researcher author Miles, Katie Aberystwyth University Researcher author Doyle, Samuel Aberystwyth University Researcher author Quincey, Duncan University of Leeds Researcher author Miles, Evan University of Leeds Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glaciers EARTH SCIENCE > Cryosphere > Snow/Ice > Snow/Ice Temperature theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Ice boreholes Ice temperature Khumbu Glacier, Nepal Water pressure theme Khumbu Glacier, Himalaya Nepal place Elevation Meteorological geographical features theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. doi doi crossReference url url crossReference url url largerWorkCitation textTable eng utf8 climatologyMeteorologyAtmosphere environment 86.16 86.85 27.94 27.99 2017-05-10 2019-09-08 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor text/plain text/csv bytes 7025459 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=eb1c141a-6313-43dd-a93c-86bcacd80203 WWW:LINK-1.0-http--link Get Data Download data download bytes 7025459 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=eb1c141a-6313-43dd-a93c-86bcacd80203 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The datasets are time series of various sensors (suspended sediment content, water pressure, electrical conductivity and temperature) mounted onto a basal probe string, installed in three 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. Data collection: Suspended sediment concentration was measured using turbidity sensors based on Orwin & Smart (2004). They use a photo diode to measure the backscatter of infrared light emitted by an infrared light-emitting diode. Water pressure was measured using Omega pressure transducers (model PX209-300GI). They are 4-20 mA current loop transducers that were measured using a 100 Ohm shunt resistor. Electrical conductivity was determined by inverting the resistance measured across two brass-rod electrodes (5 mm diameter, ~11 mm long, 11 mm separation). To cancel polarisation effects, the polarity of the excitation voltage was reversed. Temperatures were acquired by using Honeywell UNI-curve 192-502-LET-AOI negative temperature coefficient thermistors. All sensors were controlled by Campbell Scientific CR1000 data loggers from the glacier surface. Further details are provided in Miles et al. (2018) and Doyle et al. (2018). Resolution: The turbidity (suspended sediment concentration) sensors were calibrated in the laboratory using non-local, fine (grain size < 63 um) glacial sediment, using SSCs ranging from 0 (distilled water) to 6 g l-1. Calibration limitations are detailed in Doyle et al. (2018), but regardless, we expect SSCs between 3 - 20 g l-1 to fall within the full scale range of the sensors. The water pressure transducers are calibrated by the manufacturer, who report the sensors to be accurate to +/- 0.75 psi (+/- 0.53 m head) between 0 - 300 psi. The electrical conductivity sensors were calibrated in sodium chloride solutions against a laboratory EC probe between 0 - 200 uS cm-1. More details are given in Doyle et al. (2018). 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. Data quality: Detailed methodology of suspended sediment concentration, water pressure and electrical conductivity measurements is given in Doyle et al. (2018). Detailed methodology of thermistor measurements, including accuracy estimation, is presented by Miles et al. (2018). asNeeded completed