glcrchem_DP_2001 English utf8 dataset McMurdo Dry Valleys LTER http://mcmlter.org/ 2014-10-29 ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions ISO 19115-2:2009(E) Geochemistry of cryoconite holes collected from Canada Glacier in Jan 2001 2014-10-29 publication Andrew Fountain Portland State University http://www.pdx.edu (503) 725-3386 P.O. Box 751 Portland OR 97207 US andrew@pdx.edu http://glaciers.pdx.edu/fountain/ pointOfContact documentDigital The chemistry of cryoconite holes on Canada glacier was measured in January, 2001 at seven locations. Water analysis was conducted for pH, electrical conductivity and a nematodes census. Name: Thomas Nylen Role: field crew Name: Dorota Porazinska Role: field crew Name: Kathleen A. Welch Role: associated researcher Name: Inigo San Gil Role: data manager completed McMurdo Dry Valleys LTER http://mcmlter.org/ unknown adds metadata in 2016 inorganic nutrients theme LTER Core Areas English The Canada Glacier a small glacier flowing south-east into the northern side of Taylor Valley.  The glacier receives less than 10 cm of snowfall annually. Its seasonal melting feeds Lake Hoare to the west and Lake Fryxell to the east. 163.057708740234 162.894287109375 -77.632133483887 -77.598403930664 ground condition 2001-01-01 2001-01-31 Data contained in these files has been subjected to quality control standards imposed by the investigator. The user of this data should be aware that, while efforts have been taken to ensure that these data are of the highest quality, there is no guarantee of perfection for the data contained herein and the possibility of errors exists. If you encounter questionable data, please contact the MCM LTER data manager so that the data can be corrected or qualified. Thus, these data may be modified and future data will be appended. https://mcm.lternet.edu/sites/default/files/data/glcrchem_DP_2001.csv glcrchem_DP_2001 eng; US McMurdo Dry Valleys LTER glcrchem_DP_2001 Data Source Definition : Units and columns descriptions for the spreadsheet containing the canada glacier chem analysis of the cryo holes. Record Delimiter : \r\n Number of Header Lines : 1 Number of Footer Lines : 0 Orientation : Column Quote Character : "Field Delimiter : , false GLACIER NAME OF GLACIER WHERE MEASUREMENT IS MADE LOCATION NAME Locations name for sampling place. Latitude Sample Latitude LONGITUDE Sample Longitude COMMENTS Comments about the overall data DATE_TIME Date sample was collected Date Time Format: MM/DD/YYYY SAMPLE_NAME Original name for sample when gathered in field, submitted to INSTAAR Br mg/L Bromine concentration Br uM Bromine concentration, in micro Moles Ca (mg/L) Calcium concentration Ca (uM) Concentration of Calcium in micro moles Cl mg/L The Chloro concentration Cl (uM) The concentration of Chloro F mg/L The iron concentration F uM The concentration of Iron in micromoles K mg/L Potassiium concentration K uM The concentration of Potassium measured in micromoles Mg mg/L Concentration of magnesium in milligrams per liter Mg uM Concentration of magnesium in micro moles Na mg/L Concentration of sodium in milligrams per liter Na uM Concentration of sodium in micro moles NO3 mg/L Concentration of nitrites in milligrams per liter NO3 uM Concentration of nitrites in micro molar SO4 mg/L Concentration of sulfates in milligrams per liter SO4 uM Concentration of sulfates in micro molar units pH The concentration of hydrogen ions, as pH microS/cm The electrical conductivity as microsiemens per cm DOC Dissolved Organic Carbon, unknown units File Name The file name where the data was stored originally DBF https://mcm.lternet.edu/sites/default/files/data/glcrchem_DP_2001.csv dataset The Canada glacier was sampled for cryoconite holes over a period of three days by Thomas Nylen, Robin Johnston and Dorota Porazinska. Samples 1-12 were collected in the evening of 16 January 2001, samples 13-38 throughout the entire day of 17 January 2001, and the remaining sampl es throughout the entire day of 18 January 2001.Samples were taken from seven different locations on the Canada Glacier. GPS coordinates of these sites and the number of samp les taken at each site is the following: Met Station: S 77deg 36.7' and E 162deg 57.7', Number of samples = 12 Upper West: S 77deg 36.5' and E 162deg 56.4', Number of samples = 3 Upper East: ?, Number of samples = 7 Middle East: S 77deg 36.8' and E 163deg 10.1', Number of samples = 7 Lower East: S 77deg 37.4' and ?, Number of samples = 7 Lower Central: Stake #65 (need to get from Thomas), Number of samples = 6 Lower West: S 77deg 37' 17" and E 162deg 55' 56", Number of samples = 7 Middle West: S 77deg 37' 11.4" and E 162deg 56' 08.6", Number of samples = 6 At each location, cryoholes adjacent to each other were sampled. All cryoholes (except one) were frozen solid. To reach the sediment layer, a Sipre ice corer was used. As soon as a cryohole was located, the diameter in N-S and E-W directions was recorded, and followed by drilling into the ice until the sediments would show up in the drilling dust accumulating on the ice surface. All drilling was done by Thomas Nylen. When the ice core was excavated, the depth of the cryohole (from the ice surface to bottom of the sediment layer), and the width of the sediment layer were measured. Only 25 cm (from the bottom of the sediment up) of the ice core were packed into sterile Whirl-Pak large plastic bags, stored in a back pack and brought down to the Lake Hoare camp lab. The Sipre ice corer and other heavy supplies were pulled on sleds. All ice cores were left in the lab at room temperature conditions to melt. Since plastic bags can be perforated by the sharpness of ice cores, bags containing ice cores were placed in plastic beakers to prevent leakage. Ice cores melted within 16 hours. When melted, samples were shaken to mix the sediment and water and left for at least 5 hours for the sediment to settle. 300 ml of supernatant were transferred into 500 ml Nalgene bottles (washed in soap water and rinsed three times with DI water). 100 ml of this volume were filtered on a column tower using 47mm 0.4micro PC membrane filters and collected into 100ml Nalgene bottles (washed as above) and used for cation and anion concentrations. Additional 100ml was filtered through baked 47mm Whatman GF/F filters and collected into 100ml amber glass bottles (washed as above, and baked at 470degC capped with aluminum foil, then closed with original caps that were rinsed in 10% HCL and DI water) for DOC. To kill all possible organisms in the water samples and thus prevent usage of DOC, samples were fixed with 1 ml of 37% HCL ( added to the bottles right after filtration). Filtration was done by Dorota Porazinska. The remaining water with sediment was transferred from the Whirl-Pak bags into 500ml Nalgene bottles. All samples were packed into coolers and transported back to McMurdo lab on 20 January 2001 where they were processed for pH, EC, and nematodes using standard protocols. [DP 20 Jan 01]. Metadata Access Constraints: none Metadata Use Constraints: none annually McMurdo Dry Valleys LTER http://mcmlter.org/ pointOfContact