Lamy, Frank; Kilian, Rolf; Arz, Helge Wolfgang; Francois, Jean-Pierre; Kaiser, Jérôme; Prange, Matthias; Steinke, Tatjana (2010): Sedimentological and pollen records from the fjord region of southern Chile [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.760035, Supplement to: Lamy, F et al. (2010): Holocene changes in the position and intensity of the southern westerly wind belt. Nature Geoscience, 3(10), 695-699, https://doi.org/10.1038/ngeo959
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Abstract:
The position and intensity of the southern westerly wind belt varies seasonally as a consequence of changes in sea surface temperature. During the austral winter, the belt expands northward and the wind intensity in the core decreases. Conversely, during the summer, the belt contracts, and the intensity within the core is strengthened. Reconstructions of the westerly winds since the last glacial maximum, however, have suggested that changes at a single site reflected shifts throughout the entire southern wind belt. Here we use sedimentological and pollen records to reconstruct precipitation patterns over the past 12,500 yr from sites along the windward side of the Andes. Precipitation at the sites, located in the present core and northern margin of the westerlies, is driven almost entirely by the wind belt, and can be used to reconstruct its intensity. Rather than varying coherently throughout the Holocene epoch, we find a distinct anti-phasing of wind strength between the core and northern margin over multi-millennial timescales. During the early Holocene, the core westerlies were strong whereas the northern margin westerlies were weak. We observe the opposite pattern in the late Holocene. As this variation resembles modern seasonal variability, we suggest that our observed changes in westerly wind strength can best be explained by variations in sea surface temperature in the eastern South Pacific Ocean.
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Median Latitude: -52.812209 * Median Longitude: -73.230191 * South-bound Latitude: -52.903500 * West-bound Longitude: -73.801900 * North-bound Latitude: -52.621800 * East-bound Longitude: -71.702700
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Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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11 datasets
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Datasets listed in this publication series
- Lamy, F; Kilian, R; Arz, HW et al. (2010): Age determination of sediment core GC2. https://doi.org/10.1594/PANGAEA.760024
- Lamy, F; Kilian, R; Arz, HW et al. (2010): (Figure 2h) Pollen percentage of hygrophytic taxa of core GC2. https://doi.org/10.1594/PANGAEA.760034
- Lamy, F; Kilian, R; Arz, HW et al. (2010): Age determination of sediment core Palm2. https://doi.org/10.1594/PANGAEA.760025
- Lamy, F; Kilian, R; Arz, HW et al. (2010): (Figure 2c) Biogenic carbonate accumulation rate from core Palm2. https://doi.org/10.1594/PANGAEA.760030
- Lamy, F; Kilian, R; Arz, HW et al. (2010): Age determination of sediment core Sk1. https://doi.org/10.1594/PANGAEA.760026
- Lamy, F; Kilian, R; Arz, HW et al. (2010): (Figure 2b) Clay/silt ratios from core Sk1. https://doi.org/10.1594/PANGAEA.760029
- Lamy, F; Kilian, R; Arz, HW et al. (2010): Age determination of sediment core TM1. https://doi.org/10.1594/PANGAEA.760027
- Lamy, F; Kilian, R; Arz, HW et al. (2010): (Figure 2d, 2e) Accumulation rate of siliciclastic material and terrestrial organic carbon accumulation rate from core TM1. https://doi.org/10.1594/PANGAEA.760031
- Lamy, F; Kilian, R; Arz, HW et al. (2010): Age determination of sediment core TML1. https://doi.org/10.1594/PANGAEA.760028
- Lamy, F; Kilian, R; Arz, HW et al. (2010): (Figure 2f) Terrestrial organic carbon accumulation rate from core TML1. https://doi.org/10.1594/PANGAEA.760032
- Lamy, F; Kilian, R; Arz, HW et al. (2010): (Figure 2g) Relative pollen percentages of Misodendron of core TML1. https://doi.org/10.1594/PANGAEA.760033