uid=MCM,o=EDI,dc=edirepository,dc=org all public read commonwealth_ion_flux W. Berry Lyons

275 Mendenhall Lab Columbus OH 43210 US

(614) 688-3241 lyons.142@osu.edu http://research.bpcrc.osu.edu/EnvironmentalGeochemistry/ https://orcid.org/0000-0002-3143-7251 Rebecca Whiterow

US

McMurdo Dry Valleys LTER http://mcmlter.org/ Chris Gardner gardner.177@osu.edu https://orcid.org/0000-0003-0400-3754 data manager Inigo San Gil

Department of Biology, MSC03 2020 University of New Mexico Albuquerque NM 87131 US

(505) 277-2625 (505) 277-2541 isangil@lternet.edu data manager 2014-11-05 English

As part of a geochemical study of the Commonwealth Glacier in Taylor Valley, Antarctica, two 3-meter snow pits were dug in the accumulation zone and analyzed for major ions by ion chromatography. This dataset shows the mean annual atmospheric flux of chloride, sulfate, nitrate, and calcium to the Commonwealth Glacier. Determination of the atmospheric flux of these ions to the glacier surface aids in assessing the chemical composition of precipitation to the McMurdo Dry Valleys and the role of glaciers in the geochemical cycles of the region.

anions cations chemistry ions precipitation snow LTER Controlled Vocabulary anions Antarctica cations chemistry glacier ions precipitation snow Station Keywords inorganic nutrients LTER Core Areas

This data package is released under the Creative Commons Attribution 4.0 International License (CC BY 4.0; http://creativecommons.org/licenses/by/4.0/), which allows consumers (hereinafter referred to as “Data Users”) to freely reuse, redistribute, transform, or build on this work (even commercially) so long as appropriate credit is provided. Accordingly, Data Users are required to properly cite this data package in any publications or in the metadata of any derived products that result from its use (in whole or in part). A recommended citation is provided on the summary metadata page associated with this data package in the McMurdo Dry Valleys LTER Data Catalog (https://mcmlter.org/data), and a generic citation may be found on the summary metadata page in the repository where this data package was obtained. When these data contribute significantly to the contents of a publication, Data Users must also acknowledge that data were provided by the NSF-supported McMurdo Dry Valleys Long Term Ecological Research program (OPP-2224760). This data package has been released in the spirit of open scientific collaboration. Hence, Data Users are strongly encouraged to consider consultation, collaboration, and/or co-authorship (as appropriate) with the data package creator(s). Data Users should be aware these data may be actively used by others for ongoing research; thus, coordination may be necessary to prevent duplicate publication. Data Users should also recognize that misinterpretation of data may occur if they are used outside the context of the original study. Hence, Data Users are urged to contact the data package creator(s) if they have any questions regarding methodology or results. While substantial efforts are made to ensure the accuracy of this data package (with all its components), complete accuracy cannot be guaranteed. Periodic updates to this data package may occur, and it is the responsibility of Data Users to check for new versions. This data package is made available “as is” and comes with no warranty of accuracy or fitness for use. The creator(s) of this data package and the repository where these data were obtained shall not be liable for any damages resulting from misinterpretation, use, or misuse of these data. Finally, as a professional courtesy, we kindly request Data Users notify the primary contact referenced in the metadata when these data are used in the production of any derivative work or publication. Notification should include an explanation of how the data were used, along with a digital copy of the derived product(s). Thank you.

https://mcm.lternet.edu/content/geochemical-flux-commonwealth-glacier The Commonwealth glacier flows in a southeasterly direction and enters the northern side of Taylor Valley immediately west of Mount Coleman. Named by the British Antarctic Expedition for the Commonwealth of Australia in the early 1900s.   163.197784423828 163.373565673828 -77.545059204102 -77.589111328125 286 286 meter 2003-11-01 adds metadata in 2016; san gil McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER

Chemical measurements from two snow pits on the Commonwealth Glacier were obtained in this work. After the initial excavation of the snow pit using standard avalanche shovels, the sampling wall face was scraped off using polypropylene shovels that had been cleaned by successive soakings in 18 Mohm MilliQ water. The snow was prepared for sampling by using a Teflon spatula to loosen the section. A Teflon sampling device was then slid into the snow layer and gently manipulated to loosen the compacted snow. The snow sample was placed into a 500 mL HDPE container that had been previously soaked overnight and rinsed three times with 18 Mohm MilliQ water at Crary Laboratory and transported to the field site empty. Samples remained frozen until immediately prior to analysis at McMurdo Station using a Dionex DX-120 ion chromatograph (IC). The technique, a modification of Welch et al. (1996), implements a sample loop of approximately 400 uL for all standards and samples. A Dionex IonPac AS14 analytical column (4x250 mm) and AG14 guard column (4x50 mm) were used with an ASRS Ultra Anion Self-Regenerating Suppressor to analyze major anions. The eluent was a 3.5 mM Na2CO3 and 1.0 mM NaHCO3 solution with a pump flow-rate of 1.2 mL min-1. Cations were analyzed using the Dionex IonPac CS12A analytical column (4x250 mm), a CG12A guard column (4x50 mm), and a CSRS Ultra Cation Self-Regenerating Suppressor. The 1.3% methanesulfonic acid eluent had a flow-rate of 1.2 mL min-1. A stock standard solution was created from several single-element standards. The multi-element stock standard was diluted to produce six calibration standards with a range of concentrations that covered the estimated concentrations of the samples. Analytical and filtration blanks were run before, during, and after samples. An independent multi-element standard was analyzed after creating a calibration curve to satisfy quality assurance and quality control. Several sample duplicates were analyzed for recovery comparisons and were used for precision analysis. Maximum analytical variability between samples was +/-3.3% for Cl-, +/-10.9% for Ca2+, and +/-14.4% for NO3-. The snow pits were dated with a +/- 1 year accuracy using Na+ peaks, which commonly define the austral autumn when low sea-ice extent and high maritime winds deposit large amounts of sea salt on glacial surfaces (Legrand and Mayewski, 1997). The assigned dates were compared to physical mass balance measurements made since 1993 by the MCM LTER. Annual accumulation in water equivalents was calculated using measured density and snow layer thickness. Flux data were calculated, Fj = Cj*Bj where Fj is the flux for any given year, Cj is the average concentration for a given year, and Bj is the accumulation rate in water equivalents for that year. This procedure was applied for all annual layers in both snow pits. The calculated values for corresponding years were then averaged between the two snow pits.

GLACIER_COMMON_ION_FLUX GLACIER_COMMON_ION_FLUX.csv 2821 27 1 \n column , " https://mcm.lternet.edu/sites/default/files/GLACIER_COMMON_ION_FLUX.csv DATASET_CODE DATASET_CODE Code representing the entity that holds the data string Code representing the entity that holds the data GLACIER GLACIER Name of the glacier string Name of the glacier LAYER_YEAR Year Year of deposition date YYYY Mean Cl (umol/m2/yr) Mean Cl (umol/m2/yr) The annual flux of chloride to the glacier averaged between the two snow pits (umol/m2/yr) umol/m2/yr real NULL None given Cl Error Cl Error The difference between the annual flux for an analyte and the maximum and minimum values for that year. umol/m2/yr real NULL None given Mean NO3 (umol/m2/yr) Mean NO3 (umol/m2/yr) The annual flux of nitrate to the glacier averaged between the two snow pits (umol/m2/yr) umol/m2/yr real NULL None given NO3 Error NO3 Error The difference between the annual flux for an analyte and the maximum and minimum values for that year. umol/m2/yr real NULL None given Mean Ca (umol/m2/yr) Mean Ca (umol/m2/yr) The annual flux of calcium to the glacier averaged between the two snow pits (umol/m2/yr) umol/m2/yr real NULL None given Ca Error Ca Error The difference between the annual flux for an analyte and the maximum and minimum values for that year. umol/m2/yr real NULL None given Mean SO4 (umol/m2/yr) Mean SO4 (umol/m2/yr) The annual flux of sulfate to the glacier averaged between the two snow pits (umol/m2/yr) umol/m2/yr real NULL None given SO4 Error SO4 Error The difference between the annual flux for an analyte and the maximum and minimum values for that year. umol/m2/yr real NULL None given