18ff2b3c-ba0c-4b5b-83b4-79b0d978aa66 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 2017-03-09 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 Seasonal changes in snow water equivalent and chemical properties on Gourlay Snowfield and Tuva Glacier, Signy Island, Antarctica, 2012-2013 2017-03-09 creation 2017-03-09 revision 2017-03-09 publication 2017-03-09 released 1 https://doi.org/10.5285/18ff2b3c-ba0c-4b5b-83b4-79b0d978aa66 doi GB/NERC/BAS/PDC/00928 https://data.bas.ac.uk/ NE/H014446/1 award NE/H014802/1 award Please cite this item as: None Between December 2012 and March 2013, snow measurements were conducted at both Gourlay Snowfield and Tuva Glacier, Signy Island. Sites are denoted 'TX' and 'GY', where 'X' and 'Y' are numbers representing one of nine snowpits in a grid at Tuva and Gourlay respectively. Measurements include snow water equivalent and chemical properties. Snow thickness was measured during the surveys (and opportunistically following fresh snowfall events) at all 18 snow pits using an avalanche probe (average of 3 readings per sampling site). Snow density was also assessed at each site using a 1L pvc. snow tube. The thickness of the superimposed ice was measured at the beginning and at the end of the season after excavation using an ice axe. In order to calculate the proportion of the total winter accumulation that was transformed into superimposed ice by refreezing, its density was assumed to be 0.9 kg L-1. Three surveys at each of the 18 sites were conducted for biogeochemical conditions: 'top' refers to the upper 20cm; 'mid' refers to the rest of the snow; and 'ice' is the basal ice (refrozen snowmelt on top of last summer's surface). Key chemical properties determined include pH, dissolved organic carbon, total dissolved inorganic carbon, ammonium, chlorophyll and major ions. Funding was provided by the NERC grants NE/H014446/1 and NE/H014802/1. No credit. completed Hodson, Andy University of Sheffield Researcher author Pearce, David British Antarctic Survey Researcher author Sabacka, Marie University of Bristol Researcher author Convey, Pete British Antarctic Survey 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 > Glaciers/Ice Sheets > Ice Sheets EARTH SCIENCE > Cryosphere > Snow/Ice > Snow/Ice Chemistry 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 Biogeochemistry Glacier Signy Island Snow theme Gourlay Snowfield and Tuva Glacier, Signy Island Antarctica 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 This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/ otherRestrictions This data is governed by the NERC data policy and supplied under Open Government Licence v.3 otherRestrictions Requests for data can be made via the UK Polar Data Centre (UK PDC) at BAS. url url crossReference url url crossReference url url largerWorkCitation url url crossReference textTable eng utf8 climatologyMeteorologyAtmosphere environment -45.644 -45.607 -60.726 -60.709 2012-12-11 2013-03-12 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 bytes 1 https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=18ff2b3c-ba0c-4b5b-83b4-79b0d978aa66 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The pH was determined using standard, portable meter and electrodes (Hanna Instruments, UK) calibrated using fresh pH 4 and 7 buffers. The other parameters required analysis of a filtered sample, which was undertaken immediately after melting. For both DOC and TDIC, a 50mL aliquot was filtered through a Whatman GFF filter paper (notional pore space: 0.7 µm) and stored in pre-rinsed 40 mL glass vials for DOC analyses using the membrane conductometric method. This employed a Sievers 5310 Analyser with UV and persulphate digestion (detection limit 0.01 mg L-1 and < 5% precision errors according to repeat analysis of mid-range (0.4 mg L-1) standards. For NH4+ we employed the fluorescence technique described by Taylor et al (2007), using a Turner Instruments Aquafluor fluorometer, with a 375 nm excitation LED and a 420 nm long pass filter for emission detection. The samples were incubated for typically three to five hours in order to optimise the intensity of the fluorescence and enable a detection limit of 0.1 µg L-1. The same device was also used to provide an optical measure of the abundance of fluorescent DOC in the filtered samples. Untreated samples were allowed to equilibrate to room temperature and the average of three fluorescence readings taken at the same wavelengths used for the NH4+ detection. These excitation/emission wavelengths are used as an industry standard for the detection of chromophoric dissolved organic matter or 'CDOM' and readings are used here to assess whether there were any changes in the source of the DOC. Melted snow or ice (300-900 mL) was filtered under low pressure onto 25 mm GF/F filters (combusted at 450°C for 5 hours). All sample and filter handling was conducted under low light and low temperature conditions and in an acid-free environment. Filters were stored in glassine envelopes in -80°C until further analysis (1-8 weeks). Filters were then added to clean glass scintillation vials with 10 ml of 80% methanol for extraction. Chlorophyll-a standards (Anacystis nidulans, Sigma) were made just prior to analysis (0, 1, 2, 5, 10, 50, 100, 200, 500 and 1000 µg L-1). Triplicate measurements were conducted using the Turner Designs Aquafluor fluorometer with excitation at 395 + 65 nm. The accuracy was tested by repeated use of blanks, chlorophyll standards and a solid standard. Samples from the first survey at each site were also subject to analysis after 0.45 µm filtration (WCN paper) to ion chromatography, with a detection limit of 1 ppb and precision errors of 5% or better on mid-range calibration solutions. Data collection: Instruments used include: Turner Instruments Aquafluorometer Sievers 5310 Analyser Dionex DX90 Apogee SQ100 pyranometer asNeeded completed