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Voigt, Ines; Chiessi, Cristiano Mazur; Prange, Matthias; Mulitza, Stefan; Groeneveld, Jeroen; Varma, Vidya; Henrich, Rüdiger (2015): Stable oxygen isotope data of Globorotalia inflata and radiocarbon dates for sediment cores GeoB6211-2, GeoB13862-1, and GeoB6308-3. PANGAEA, https://doi.org/10.1594/PANGAEA.841893, Supplement to: Voigt, I et al. (2015): Holocene shifts of the southern westerlies across the South Atlantic. Paleoceanography, 30(2), 39-51, https://doi.org/10.1002/2014PA002677

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Abstract:
The Southern Westerly Winds (SWW) exert a crucial influence over the world ocean and climate. Nevertheless, a comprehensive understanding of the Holocene temporal and spatial evolution of the SWW remains a significant challenge due to the sparsity of high-resolution marine archives and appropriate SWW proxies. Here, we present a north-south transect of high-resolution planktonic foraminiferal oxygen isotope records from the western South Atlantic. Our proxy records reveal Holocene migrations of the Brazil- Malvinas Confluence (BMC), a highly sensitive feature for changes in the position and strength of the northern portion of the SWW. Through the tight coupling of the BMC position to the large-scale wind field, the records allow a quantitative reconstruction of Holocene latitudinal displacements of the SWW across the South Atlantic. Our data reveal a gradual poleward movement of the SWW by about 1-1.5° from the early to the mid-Holocene. Afterwards variability in the SWW is dominated by millennial-scale displacements in the order of 1° in latitude with no recognizable longer-term trend. These findings are confronted with results from a state-of-the-art transient Holocene climate simulation using a comprehensive coupled atmosphere-ocean general circulation model. Proxy-inferred and modeled SWW shifts compare qualitatively, but the model underestimates both orbitally forced multi-millennial and internal millennial SWW variability by almost an order of magnitude. The underestimated natural variability implies a substantial uncertainty in model projections of future SWW shifts.
Coverage:
Median Latitude: -36.399122 * Median Longitude: -52.499311 * South-bound Latitude: -39.302200 * West-bound Longitude: -53.965000 * North-bound Latitude: -32.505200 * East-bound Longitude: -50.242700
Date/Time Start: 1999-12-12T16:21:00 * Date/Time End: 2009-06-29T04:44:00
Size:
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