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