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Balmer, Sven; Sarnthein, Michael; Mudelsee, Manfred; Grootes, Pieter Meiert (2016): (Supporting Information) 14Cage plateau tuning of local Atlantic sediment cores. PANGAEA, https://doi.org/10.1594/PANGAEA.863718, Supplement to: Balmer, S et al. (2016): Refined modeling and 14C plateau tuning reveal consistent patterns of glacial and deglacial 14C reservoir ages of surface waters in low-latitude Atlantic. Paleoceanography, https://doi.org/10.1002/2016PA002953

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Abstract:
Modeling studies predict that changes in radiocarbon (14C) reservoir ages of surface waters during the last deglacial episode will reflect changes in both atmospheric 14C concentration and ocean circulation including the Atlantic Meridional Overturning Circulation. Tests of these models require the availability of accurate 14C reservoir ages in well-dated late Quaternary time series. We here test two models using plateau-tuned 14C time series in multiple well-placed sediment core age-depth sequences throughout the lower latitudes of the Atlantic Ocean. 14C age plateau tuning in glacial and deglacial sequences provides accurate calendar year ages that differ by as much as 500-2500 years from those based on assumed global reservoir ages around 400 years. This study demonstrates increases in local Atlantic surface reservoir ages of up to 1000 years during the Last Glacial Maximum, ages that reflect stronger trades off Benguela and summer winds off southern Brazil. By contrast, surface water reservoir ages remained close to zero in the Cariaco Basin in the southern Caribbean due to lagoon-style isolation and persistently strong atmospheric CO2 exchange. Later, during the early deglacial (16 ka) reservoir ages decreased to a minimum of 170-420 14C years throughout the South Atlantic, likely in response to the rapid rise in atmospheric pCO2 and Antarctic temperatures occurring then. Changes in magnitude and geographic distribution of 14C reservoir ages of peak glacial and deglacial surface waters deviate from the results of Franke et al. (2008) but are generally consistent with those of the more advanced ocean circulation model of Butzin et al. (2012).
Coverage:
Median Latitude: -16.868301 * Median Longitude: -24.766099 * South-bound Latitude: -27.252670 * West-bound Longitude: -46.470330 * North-bound Latitude: -4.245000 * East-bound Longitude: 12.376667
Date/Time Start: 1992-01-11T00:00:00 * Date/Time End: 1998-10-14T00:00:00
Size:
10 datasets

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Datasets listed in this publication series

  1. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S1 a) Definition of planktic 14C plateaus for sediment core GeoB1711-4. https://doi.org/10.1594/PANGAEA.863635
  2. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S1 b) Definition of planktic 14C plateaus for sediment core GeoB3910-1. https://doi.org/10.1594/PANGAEA.863636
  3. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S1 c) Definition of planktic 14C plateaus for sediment core KNR159-5-36GGC. https://doi.org/10.1594/PANGAEA.863637
  4. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S2) Correlation of 14C ages in sediment core GeoB3910-2 to core depths in sediment core GeoB3910-1 by means of tuning (XRF-based) high-resolution Ti/Ca records. https://doi.org/10.1594/PANGAEA.863646
  5. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S3a) 14C ages measured on Globigerina bulloides of sediment core GeoB1711-4. https://doi.org/10.1594/PANGAEA.863647
  6. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S3b) 14C ages measured on Globigerinoides sacculifer of sediment core GeoB3910-1. https://doi.org/10.1594/PANGAEA.863674
  7. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S3c) 14C ages measured on Globigerinoides ruber of sediment core KNR159-5-36GGC. https://doi.org/10.1594/PANGAEA.863704
  8. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S4a) Age control points used for calculation of sedimentation rates of sediment coreGeoB1711-4. https://doi.org/10.1594/PANGAEA.863708
  9. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S4b) Age control points used for calculation of sedimentation rates of sediment coreGeoB3910-1. https://doi.org/10.1594/PANGAEA.863711
  10. Balmer, S; Sarnthein, M; Mudelsee, M et al. (2016): (Table S4c) Age control points used for calculation of sedimentation rates of sediment coreKNR159-36. https://doi.org/10.1594/PANGAEA.863712