GLACIER_SUPRA_TRACER English utf8 dataset McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact 2020-02-11 ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions ISO 19115-2:2009(E) Nutrient tracer injection experiments in supraglacial streams on Canada Glacier, Antarctica, January 2019 2020-02-11 publication Anna Bergstrom Boise State University https://www.boisestate.edu/ annabergstrom@boisestate.edu pointOfContact Michael Gooseff University of Colorado Boulder http://www.colorado.edu/ michael.gooseff@colorado.edu http://goosefflab.weebly.com pointOfContact documentDigital This dataset contains a series of grab samples collected from nutrient tracer injection experiments conducted in supraglacial streams on Canada Glacier in Taylor Valley, Antarctica. The purpose of these experiments was to measure potential nutrient uptake in supraglacial stream networks. We chose three reaches and co-injected nutrient tracer(s) and a conservative tracer (NaCl). Tracers were injected at the top of each reach, allowed to mix with the stream water, and move downstream. Grab samples in this dataset were collected at the base of the reach over the course of these tracer experiments, which ran from 14-19 January 2019. Name: Joel G. Singley Role: field technician Name: Matthew J. Cohen Role: associated researcher Name: Kathleen A. Welch Role: lab technician Name: Renée F. Brown Role: data manager completed McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact 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 2019-01-14 2019-01-19 https://mcm.lternet.edu/sites/default/files/data/GLACIER_SUPRA_TRACER.csv GLACIER_SUPRA_TRACER eng; US McMurdo Dry Valleys LTER GLACIER_SUPRA_TRACER Data Source Definition : Supraglacial Stream Tracer Experiment Number of Header Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET_CODE Internal dataset code. INDEX_CODE Internal lab code / unique identifier. REACH Reach in which the experiment was conducted. SAMPLE Sample number/name within the experiment, where BG is a background sample, "Bottom" is the end of the reach, "Top" is the start of the reach. Numeric samples are collected during the tracer experiment. INJECTION Nutrient(s) used in the specific experiment, where N is nitrogen, P is phosphorus, C is carbon. E.g., N+P indicates both nitrogen and phosphorous were injected. DATE_TIME Date and time when sample was collected (GMT+13). Date Time Format: DD/MM/YYYY HH:MM:SS CL_MG_L Chloride (Cl) concentration in the sample. N-NO3_MG_L Nitrogen (N-NO3) concentration in the sample. Any value of 0 is below the detection limit of the instrument. P-PO4_MG_L Phosphorus (P-PO4) concentration in the sample. Any value of 0 is below the detection limit of the instrument. SO4_MG_L Sulfate (SO4) concentration in the sample. NA_MG_L Sodium (Na) concentration in the sample. K_MG_L Potassium (K) concentration in the sample. MG_MG_L Magnesium (Mg) concentration in the sample. CA_MG_L Calcium (Ca) concentration in the sample. DBF https://mcm.lternet.edu/sites/default/files/data/GLACIER_SUPRA_TRACER.csv dataset We performed a series of nutrient tracer experiments in each of the three study reaches over the week of 14-19 January 2019, starting farthest downstream at Reach 2. Three stream reaches were located in the lower Canada Glacier ablation zone of Taylor Valley, Antarctica (Reach 1: -77.62767, 163.96059; Reach 2: -77.6281, 163.957583; Reach 3: -77.629258, 163.964103). Prior to each addition, we collected at least two background samples from both the bottom and top of the study reach. For each experiment, we released known masses of nutrients (N as NaNO3, P as KH2PO43-, and C as glucose) and conservative tracer (NaCl) pre-dissolved in 1 L of stream water as an instantaneous slug at the head of the reach. At the base of the reach, we took grab samples at regular intervals of salt concentration change as measured by a handheld electrical conductivity probe. We analyzed grab samples for NO3-, PO43-, and major ions using an IC located at McMurdo Station. We released only one tracer per day in any given reach to assure all concentrations were fully at background levels before the next tracer experiment. We did a series of tracer injections combining different nutrients: N as NaNO3, N+P (NaNO3 and KH2PO43-), N+P+C (NaNO3, KH2PO43-, and glucose). We had deteriorating weather over the course of the six days in which we conducted tracer experiments. A 24 hour period of clouds and low temperatures caused the smaller upper reaches to freeze such that we were not able to conduct the N+P+C tracer on reaches 1 and 3. We instead moved back down to reach 2, which had low, but adequate, discharge to conduct an N+C tracer experiment. Data were analyzed using methods outlined in Covino et al., 2010 to calculate N and P uptake rates.  Metadata Access Constraints: none Metadata Use Constraints: none annually McMurdo Dry Valleys LTER http://mcmlter.org/ pointOfContact