Trudgill, Molly; Shuttleworth, Rachael; Bostock, Helen C; Burke, Andrea; Cooper, Matthew J; Greenop, Rosanna; Foster, Gavin L (2020): Sr-Nd-Pb composition, 230Th-normalised detrital fluxes and grain size analysis of 4 sediment cores in the SW Pacific over the last ~30ka [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.924765
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Abstract:
Atmospheric dust is a primary source of iron (Fe) to the open ocean, and its flux is particularly important in the high nutrient, low chlorophyll (HNLC) Southern Ocean where Fe currently limits productivity. Alleviation of this Fe limitation in the Subantarctic Zone of the Atlantic by increased dust-borne Fe supply during glacial periods has been shown to increase primary productivity. However, previous work has found no such increase in productivity in the Pacific sector. In order to constrain the relative importance of Southern Ocean Fe fertilization on glacial-interglacial carbon cycles, records of dust fluxes outside of the Atlantic sector of the Southern Ocean at the Last Glacial Maximum (LGM) are required. Here we use grain size and U-series analyses to reconstruct lithogenic and CaCO3 fluxes, and Nd, Sr and Pb isotopes to ascertain the provenance of terrigenous material delivered to four deep-water cores in the SW Pacific Ocean over the last ~30kyr. We find evidence for an increase in the relative proportion of fine-grained (0.5-12 µm) terrigenous sediment and higher detrital fluxes during the LGM compared to the Holocene. The provenance of the LGM dust varied spatially, with an older, more "continental" signature (low εNd, high 87Sr/86Sr) sourced from Australia in the northern cores, and a younger, more volcanogenic source in the southern cores (high εNd, low 87Sr/86Sr), likely sourced locally from New Zealand. Given this increase in lithogenic flux to the HNLC subantarctic Pacific Southern Ocean during the LGM, factors besides Fe-supply must have regulated the biological productivity here.
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Trudgill, Molly; Shuttleworth, Rachael; Bostock, Helen C; Burke, Andrea; Cooper, Matthew J; Greenop, Rosanna; Foster, Gavin L (2020): The Flux and Provenance of Dust Delivered to the SW Pacific During the Last Glacial Maximum. Paleoceanography and Paleoclimatology, 35(12), https://doi.org/10.1029/2020PA003869
Coverage:
Median Latitude: -40.137436 * Median Longitude: -171.628014 * South-bound Latitude: -78.157240 * West-bound Longitude: 67.483425 * North-bound Latitude: 15.170000 * East-bound Longitude: -62.100000
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Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
6 datasets
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Datasets listed in this bundled publication
- Trudgill, M; Shuttleworth, R; Bostock, HC et al. (2020): Proportion of material in each end member, coefficient of determination and angular deviation values for sediment cores MD97-2121, TAN1106-43 and TAN1106-28. https://doi.org/10.1594/PANGAEA.924763
- Trudgill, M; Shuttleworth, R; Bostock, HC et al. (2020): Flux calculatiuons for sediment cores MD97-2121, TAN1106-43 and TAN1106-28. https://doi.org/10.1594/PANGAEA.924728
- Trudgill, M; Shuttleworth, R; Bostock, HC et al. (2020): Grain size analysis of sediment cores MD97-2121, TAN1106-43 and TAN1106-28. https://doi.org/10.1594/PANGAEA.924731
- Trudgill, M; Shuttleworth, R; Bostock, HC et al. (2020): Sr, Nd and Pb isotopes of cores MD97-2121, TAN1106-43 and TAN1106-28. https://doi.org/10.1594/PANGAEA.924725
- Trudgill, M; Shuttleworth, R; Bostock, HC et al. (2020): Potential source area Pb isotope compilation. https://doi.org/10.1594/PANGAEA.924755
- Trudgill, M; Shuttleworth, R; Bostock, HC et al. (2020): Potential source area Sr and Nd isotope compilation. https://doi.org/10.1594/PANGAEA.924768