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Govin, Aline; Chiessi, Cristiano Mazur; Zabel, Matthias; Sawakuchi, André Oliveira; Heslop, David; Hörner, Tanja; Zhang, Yancheng; Mulitza, Stefan (2014): Age model, stable isotopes, major element proportions and endmember unmixing results from four western tropical Atlantic cores. PANGAEA, https://doi.org/10.1594/PANGAEA.831553, Supplement to: Govin, A et al. (2014): Terrigenous input off northern South America driven by changes in Amazonian climate and the North Brazil Current retroflection during the last 250 ka. Climate of the Past, 10, 843-862, https://doi.org/10.5194/cp-10-843-2014

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Abstract:
We investigate changes in the delivery and oceanic transport of Amazon sediments related to terrestrial climate variations over the last 250 ka. We present high-resolution geochemical records from four marine sediment cores located between 5 and 12° N along the northern South American margin. The Amazon River is the sole source of terrigenous material for sites at 5 and 9° N, while the core at 12° N receives a mixture of Amazon and Orinoco detrital particles. Using an endmember unmixing model, we estimated the relative proportions of Amazon Andean material ("%-Andes", at 5 and 9° N) and of Amazon material ("%-Amazon", at 12° N) within the terrigenous fraction. The %-Andes and %-Amazon records exhibit significant precessional variations over the last 250 ka that are more pronounced during interglacials in comparison to glacial periods. High %-Andes values observed during periods of high austral summer insolation reflect the increased delivery of suspended sediments by Andean tributaries and enhanced Amazonian precipitation, in agreement with western Amazonian speleothem records. Increased Amazonian rainfall reflects the intensification of the South American monsoon in response to enhanced land-ocean thermal gradient and moisture convergence. However, low %-Amazon values obtained at 12° N during the same periods seem to contradict the increased delivery of Amazon sediments. We propose that reorganizations in surface ocean currents modulate the northwestward transport of Amazon material. In agreement with published records, the seasonal North Brazil Current retroflection is intensified (or prolonged in duration) during cold substages of the last 250 ka (which correspond to intervals of high DJF or low JJA insolation) and deflects eastward the Amazon sediment and freshwater plume.
Coverage:
Median Latitude: 11.946956 * Median Longitude: -48.198216 * South-bound Latitude: 5.433333 * West-bound Longitude: -58.330000 * North-bound Latitude: 37.799833 * East-bound Longitude: -10.166500
Date/Time Start: 1995-07-09T00:00:00 * Date/Time End: 2001-04-21T20:21:00
Size:
19 datasets

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Datasets listed in this publication series

  1. Chiessi, CM (2014): 13. 14C-AMS dates from sediment core GeoB3938-1. https://doi.org/10.1594/PANGAEA.831546
  2. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 01. Age model from sediment core GeoB4411-2. https://doi.org/10.1594/PANGAEA.831634
  3. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 02. Benthic foraminiferal stable isotopes from sediment core GeoB4411-2. https://doi.org/10.1594/PANGAEA.831636
  4. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 03. Major element proportions (XRF) and endmember unmixing results (% Andes) from sediment core GeoB4411-2. https://doi.org/10.1594/PANGAEA.831637
  5. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 04. Resampled and filtered % Andes records from sediment core GeoB4411-2. https://doi.org/10.1594/PANGAEA.831638
  6. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 06. Age model from sediment core GeoB7010-2. https://doi.org/10.1594/PANGAEA.831640
  7. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 07. Benthic foraminiferal stable isotopes from sediment core GeoB7010-2. https://doi.org/10.1594/PANGAEA.831641
  8. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 08. Major element proportions (XRF) and endmember unmixing results (% Andes) from sediment core GeoB7010-2. https://doi.org/10.1594/PANGAEA.831642
  9. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 09. Age model from sediment core GeoB7011-1. https://doi.org/10.1594/PANGAEA.831543
  10. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 10. Benthic foraminiferal stable isotopes from sediment core GeoB7011-1. https://doi.org/10.1594/PANGAEA.831548
  11. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 11. Major element proportions (XRF) and endmember unmixing results (% Amazon) from sediment core GeoB7011-1. https://doi.org/10.1594/PANGAEA.831550
  12. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 12. Resampled and filtered % Andes composite records from cores GeoB7010-2 and GeoB7011-1. https://doi.org/10.1594/PANGAEA.831552
  13. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 14. Age model from sediment core GeoB3938-1. https://doi.org/10.1594/PANGAEA.831544
  14. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 15. Benthic foraminiferal stable isotopes from sediment core GeoB3938-1. https://doi.org/10.1594/PANGAEA.831547
  15. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 16. Major element proportions (XRF) and endmember unmixing results (% Amazon) from sediment core GeoB3938-1. https://doi.org/10.1594/PANGAEA.831549
  16. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 17. Resampled and filtered % Amazon records from core GeoB3938-1. https://doi.org/10.1594/PANGAEA.831551
  17. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 18. Revised age model of sediment core MD95-2042 using the AICC2012 chronology: tie-points. https://doi.org/10.1594/PANGAEA.832173
  18. Govin, A; Chiessi, CM; Zabel, M et al. (2014): 19. Revised age model of sediment core MD95-2042 using the AICC2012 chronology: foraminiferal isotopes. https://doi.org/10.1594/PANGAEA.832174
  19. Mulitza, S (2014): 05. 14C-AMS dates from sediment core GeoB7010-2. https://doi.org/10.1594/PANGAEA.831639