All scientific data collected by the Australian Antarctic program (AAp) are eventually described in the Catalogue of Australian Antarctic and Subantarctic Metadata (CAASM). CAASM can be used to search through AAp data descriptions, and it also provides links to access publicly available datasets, which can either be immediately downloaded or obtained from the Australian Antarctic Data Centre (AADC).
Seawater samples were taken from the trace metal rosette system from ten different depths. Seawater samples from just underneath the ice were collected at the trace metal site using a grab sample. Water samples were spiked with 1% v/v ultra pure HCl within 24 hours of collection and stored in double Ziploc bags at ambient temperature. Brine samples were collected from sac holes at the trace metal and main bio sites. Sea ice cores were collected from either the Main Bio sample site or the Trace Metal site using sampling protocol followed by each group. Ice cores were cut using a stainless steel saw, in 6 cm sections, and then placed in double Ziploc bags and stored at -20 degrees C in large, clean plastic bins. Snow samples were collected from undisturbed sites, upwind from the ship, close to the trace metal site. Samples were collected into acid-washed glass jars (SN0 samples), or into acid-washed buckets lined with sterile Ziploc bags (FSN or UFSN samples). Snow samples were allowed to melt overnight at 4 degrees C, then acidified with 1% v/v HCl. Snow, brine, seawater samples used for mercury analysis were kept in sterile PETG bottles (250 or 500 mL), or acid-washed Teflon, or acid-washed glass bottles or jars, and preserved with 1% v/v HCl. Snow, brine, and seawater samples kept for culturing work were preserved in falcon tubes in 20% v/v glycerol and stored at -80 degrees C. For a detailed record of samples taken and analysed, please refer to the sample inventory spreadsheet.
For mercury analysis, ice core sections were cut in half with a stainless steel trace metal hand saw and melted overnight at ambient temperature in acid-washed 500 mL glass jars. Half of the ice core sections were kept preserved at -20 degrees C for future analytical work. The melt (125-250 mL) was then transferred to acid-washed Teflon bottles and acidified with 1% v/v HCl and kept at ambient temperature.
Total and methylmercury analysis:
Seawater, sea ice, snow, and brine samples were analysed for total and methyl- mercury at the Mercury Lab at the USGS Wisconsin Water Research Center in Middleton, Wisconsin in March 2013. Total mercury (HgT) analysis was performed using the Manual HgT procedure outlined on the USGS Mercury Lab's website (http://wi.water.usgs.gov/mercury-lab/analysis-methods.html), which is based on EPA Method 1631. Methylmercury (MeHG) analysis was performed per the Brooks-Rand "MERX" by ICPMS isotope dilution method (USGS Open-File Report 01-445, http://wi.water.usgs.gov/mercury-lab/analysis-methods.html).
Raw data for total mercury are saved as excel spreadsheets (YYYYMMDD_Analyst_HgT.xls), and the original logs of the chromatograms from the PeakNet software (MMDDYY.LOG). Raw data for methylmercury analysis are saved as excel files (YYYYMMDDAnalyst_MeHg Waters.xlsx), and the Chromera reports from the ICPMS.
When transferring melted core section IS7TM1D to a Teflon bottle, the sample was mixed with some of IS7TM1E (1:1 mixture, ~150 mL each), this sample is referred to as IS7TM1DE. Only had 75 mL of just IS7TM1E, and 150 mL of just IS7TM1D. IS7TM1D was run for both methyl and total mercury, but only had enough IS7TM1E to run for MeHg analysis.
These data are publicly available for download from the provided URL.
This data set conforms to the CCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=SIPEX_II_Mercury when using these data.