Rühlemann, Carsten; Mulitza, Stefan; Müller, Peter J; Wefer, Gerold; Zahn, Rainer (1999): Sea surface temperature reconstruction based on alkenones of sediment core M35003-4. PANGAEA, https://doi.org/10.1594/PANGAEA.734784, Supplement to: Rühlemann, C et al. (1999): Warming of the tropical Atlantic Ocean and slowdown of thermohaline circulation during the last deglaciation. Nature, 402(6761), 511-514, https://doi.org/10.1038/990069
Always quote citation above when using data! You can download the citation in several formats below.
Evidence for abrupt climate changes on millennial and shorter timescales is widespread in marine and terrestrial climate records (Dansgard et al., 1993, doi:10.1038/364218a0; Bond et al., 1993, doi:10.1038/365143a0; Charles et al., 1996, doi:10.1016/0012-821X(96)00083-0, Bard et al., 1997, doi:10.1038/385707a0). Rapid reorganization of ocean circulation is considered to exert some control over these changes (Broecker et al., 1985, doi:10.1038/315021a0), as are shifts in the concentrations of atmospheric greenhouse gases (Broecker, 1994, doi:10.1038/372421a0). The response of the climate system to these two influences is fundamentally different: slowing of thermohaline overturn in the North Atlantic Ocean is expected to decrease northward heat transport by the ocean and to induce warming of the tropical Atlantic (Crowley, 1992, doi:10.1029/92PA01058; Manabe and Stouffer, 1997, doi:10.1029/96PA03932), whereas atmospheric greenhouse forcing should cause roughly synchronous global temperature changes (Manabe et al., 1991, doi:10.1175/1520-0442(1991)004<0785:TROACO>2.0.CO;2). So these two mechanisms of climate change should be distinguishable by the timing of surface-water temperature variations relative to changes in deep-water circulation. Here we present a high-temporal-resolution record of sea surface temperatures from the western tropical North Atlantic Ocean which spans the past 29,000 years, derived from measurements of temperature-sensitive alkenone unsaturation in sedimentary organic matter. We find significant warming is documented for Heinrich event H1 (16,900-15,400 calendar years bp) and the Younger Dryas event (12,900-11,600 cal. yr bp), which were periods of intense cooling in the northern North Atlantic. Temperature changes in the tropical and high-latitude North Atlantic are out of phase, suggesting that the thermohaline circulation was the important trigger for these rapid climate changes.
Latitude: 12.090000 * Longitude: -61.243333
Date/Time Start: 1996-04-19T00:00:00 * Date/Time End: 1996-04-19T00:00:00
Datasets listed in this publication series
- Rühlemann, C; Mulitza, S; Müller, PJ et al. (2006): (Table 1) Age determination of sediment core M35003-4. https://doi.org/10.1594/PANGAEA.438798
- Rühlemann, C; Mulitza, S; Müller, PJ et al. (1999): Alkenones, stable isotopes and sea surface temperature from sediment core M35003-4. https://doi.org/10.1594/PANGAEA.55923