Vallelonga, Paul T; Van de Velde, K; Candelone, Jean-Pierre; Morgan, V I; Boutron, Claude F; Rosman, K J R (2011): Table 2. Lead and Ba concentrations and Pb isotopic compositions measured in Law Dome ice cores [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.763685, Supplement to: Vallelonga, PT et al. (2002): The lead pollution history of Law Dome, Antarctica, from isotopic measurements on ice cores: 1500 AD to 1989 AD. Earth and Planetary Science Letters, 204, 291-306, https://doi.org/10.1016/S0012-821X(02)00983-4
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Abstract:
Lead isotopic compositions and Pb and Ba concentrations have been measured in ice cores from Law Dome, East Antarctica, covering the past 6500 years. 'Natural' background concentrations of Pb (ab. 0.4 pg/g) and Ba (ab. 1.3 pg/g) are observed until 1884 AD, after which increased Pb concentrations and lowered 206Pb/207Pb ratios indicate the influence of anthropogenic Pb. The isotopic composition of 'natural' Pb varies within the range 206Pb/207Pb=1.20-1.25 and 208Pb/207Pb=2.46-2.50, with an average rock and soil dust Pb contribution of 8-12%. A major pollution event is observed at Law Dome between 1884 and 1908 AD, elevating the Pb concentration four-fold and changing 206Pb/207Pb ratios in the ice to ab. 1.12. Based on Pb isotopic systematics and Pb emission statistics, this is attributed to Pb mined at Broken Hill and smelted at Broken Hill and Port Pirie, Australia. Anthropogenic Pb inputs are at their greatest from 1900 to 1910 and from ab. 1960 to ab. 1980. During the 20th century, Ba concentrations are consistently higher than 'natural' levels and are attributed to increased dust production, suggesting the influence of climate change and/or changes in land coverage with vegetation.
Coverage:
Median Latitude: -66.770600 * Median Longitude: 112.716960 * South-bound Latitude: -66.774200 * West-bound Longitude: 112.357200 * North-bound Latitude: -66.769700 * East-bound Longitude: 112.806900
Date/Time Start: 1977-01-01T00:00:00 * Date/Time End: 2093-03-01T00:00:00
Minimum Elevation: 1200.0 m * Maximum Elevation: 1370.0 m
Event(s):
BHD * Latitude: -66.769700 * Longitude: 112.806900 * Date/Time Start: 1977-01-01T00:00:00 * Date/Time End: 1977-03-31T00:00:00 * Elevation: 1370.0 m * Recovery: 475 m * Location: Law Dome, Wilkes Land, Antarctica * Method/Device: Thermal drill, dry hole (THERM-D) * Comment: Surface accumulation: 650 [kg/m**2/yr]
DSS (DomeSummitSouth) * Latitude: -66.769700 * Longitude: 112.806900 * Date/Time Start: 1988-01-01T00:00:00 * Date/Time End: 2093-03-01T00:00:00 * Elevation: 1370.0 m * Recovery: 1200 m * Location: Law Dome, Wilkes Land, Antarctica * Method/Device: Electromechanical drill, fluid-filled hole (EMD-F) * Comment: Surface accumulation: 640 [kg/m**2/yr]
DSS-W2k (DomeSummitSouth) * Latitude: -66.769700 * Longitude: 112.806900 * Date/Time Start: 2000-01-01T00:00:00 * Date/Time End: 2000-01-31T00:00:00 * Elevation: 1370.0 m * Recovery: 20 m * Location: Law Dome, Wilkes Land, Antarctica * Method/Device: Hand ice drill (HID) * Comment: Surface accumulation: 600 [kg/m**2/yr]
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | AGE | Age | ka BP | Geocode | ||
| 2 | Sample code/label | Sample label | Vallelonga, Paul T | |||
| 3 | Age | Age | a AD/CE | Vallelonga, Paul T | Uncertainties in the dating of samples from DSS, DSS99, DSS-W2k and BHD are <±1 yr, while dating of DSS-W20k cores is generally <±5 yr | |
| 4 | Lead-206/Lead-207 ratio | 206Pb/207Pb | Vallelonga, Paul T | |||
| 5 | Lead-206/Lead-207, error | 206Pb/207Pb e | ± | Vallelonga, Paul T | Uncertainties in the isotope ratios are 95% confidence intervals. This includes allowance for bias based upon measurements of NIST SRM 981. | |
| 6 | Lead-208/Lead-207 ratio | 208Pb/207Pb | Vallelonga, Paul T | |||
| 7 | Lead-208/Lead-207, error | 208Pb/207Pb e | ± | Vallelonga, Paul T | Uncertainties in the isotope ratios are 95% confidence intervals. This includes allowance for bias based upon measurements of NIST SRM 981. | |
| 8 | Lead-206/Lead-204 ratio | 206Pb/204Pb | Vallelonga, Paul T | |||
| 9 | Lead-206/Lead-204 ratio, error | 206Pb/204Pb e | ± | Vallelonga, Paul T | Uncertainties in the isotope ratios are 95% confidence intervals. This includes allowance for bias based upon measurements of NIST SRM 981. | |
| 10 | Lead | Pb | ng/kg | Vallelonga, Paul T | 95% confidence intervals on concentrations are ±15%. | |
| 11 | Barium | Ba | ng/kg | Vallelonga, Paul T | 95% confidence intervals on concentrations are ±15%. | |
| 12 | Lead/Barium ratio | Pb/Ba | Vallelonga, Paul T |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
363 data points