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Bory, Aloys J-M; Wolff, Eric W; Mulvaney, Robert; Jagoutz, Emil; Wegner, Anna; Ruth, Urs; Elderfield, Henry (2010): (Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica. doi:10.1594/PANGAEA.786617,
Supplement to: Bory, AJ-M et al. (2010): Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet. Earth and Planetary Science Letters, 291(1-4), 138-148, doi:10.1016/j.epsl.2010.01.006

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The Sr and Nd isotopic composition of dust extracted from recent snow layers at the top of Berkner Island ice sheet (located within the Filchner-Ronne Ice Shelf at the southern end of the Weddell Sea) enables us, for the first time, to document dust provenance in Antarctica outside the East Antarctic Plateau (EAP) where all previous studies based on isotopic fingerprinting were carried out. Berkner dust displays an overall crust-like isotopic signature, characterized by more radiogenic 87Sr/86Sr and much less radiogenic 143Nd/144Nd compared to dust deposited on the EAP during glacial periods. Differences with EAP interglacial dust are not as marked but still significant, indicating that present-day Berkner dust provenance is distinct, at least to some extent, from that of the dust reaching the EAP. The fourteen snow-pit sub-seasonal samples that were obtained span a two-year period (2002-2003) and their dust Sr and Nd isotopic composition reveals that multiple sources are at play over a yearly time period. Southern South America, Patagonia in particular, likely accounts for part of the observed spring/summer dust deposition maxima, when isotopic composition is shifted towards 'younger' isotopic signatures. In the spring, possible additional inputs from Australian sources would also be supported by the data. Most of the year, however, the measured isotopic signatures would be best explained by a sustained background supply from putative local sources in East Antarctica, which carry old-crust-like isotopic fingerprints. Whether the restricted East Antarctic ice-free areas produce sufficient eolian material has yet to be substantiated however. The fact that large (> 5 µm) particles represent a significant fraction of the samples throughout the entire time-series supports scenarios that involve contributions from proximal sources, either in Patagonia and/or Antarctica (possibly including snow-free areas in the Antarctic Peninsula and other areas as well). This also indicates that additional dust transport, which does not reach the EAP, must occur at low-tropospheric levels to this coastal sector of Antarctica.
Latitude: -79.566700 * Longitude: -45.650000
Date/Time Start: 2003-12-01T00:00:00 * Date/Time End: 2003-12-01T00:00:00
Minimum DEPTH, ice/snow: 0.0000 m * Maximum DEPTH, ice/snow: 0.9500 m
BER01S03 (Thyssenhoehe) * Latitude: -79.566700 * Longitude: -45.650000 * Date/Time: 2003-12-01T00:00:00 * Elevation: 899.0 m * Location: Berkner Island (Thyssenhöhe) * Device: Snow pit (SNOWPIT)
87Sr/86Sr error bars span the entire possible 87Sr/86Sr range taking into account a potential carbonate contribution varying from 0 to 100% (and associated errors), in addition to the analytical measurement 2 sigma error and errors on sea-salt derived Sr estimates. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample IDSample IDBory, Aloys J-M
2Sample typeSamp typeBory, Aloys J-M
3Depth, top/minDepth topmBory, Aloys J-M
4Depth, bottom/maxDepth botmBory, Aloys J-M
5DEPTH, ice/snowDepth ice/snowmGeocode
6Sample massSamp mgBory, Aloys J-M
7Time coverageCoverageBory, Aloys J-Mestimated corresponding time slice
8delta 18O, waterd18O H2Oper mil SMOWBory, Aloys J-MThermal Ionization Mass Spectrometry (TIMS)soluble fraction
9SodiumNa+mg/lBory, Aloys J-MIon chromatographysoluble fraction
10CalciumCa2+mg/lBory, Aloys J-MIon chromatographysoluble fraction
11NeodymiumNdrelative unitsBory, Aloys J-Mtotal yield from particulate fraction in ng
12Dust concentrationDust concµg/kgBory, Aloys J-Mestimated from Nd, assuming 25 ppm Nd in the dust
13Neodymium 143/Neodymium 144143Nd/144NdBory, Aloys J-MThermal Ionization Mass Spectrometry (TIMS)particulate fraction
14Neodymium 143/Neodymium 144, error143Nd/144Nd e±Bory, Aloys J-M
15epsilon-Neodymium (0)e-Nd(0)Bory, Aloys J-Mparticulate fraction
16epsilon-Neodymium, standard deviatione-Nd std dev±Bory, Aloys J-M
17Strontium 87/Strontium 86 ratio87Sr/86SrBory, Aloys J-MThermal Ionization Mass Spectrometry (TIMS)particulate fraction
18Strontium 87/Strontium 86, error87Sr/86Sr e±Bory, Aloys J-M+ 2 sigma
19Strontium 87/Strontium 86, error87Sr/86Sr e±Bory, Aloys J-M- 2 sigma
250 data points

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