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Tuchen, Franz Philip; Brandt, Peter; Lübbecke, Joke; Hummels, Rebecca (eds.) (2021): Transports and pathways of the tropical AMOC return flow from Argo data and shipboard velocity measurements [dataset editorial publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.937809

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Published: 2021-11-03 • DOI registered: 2022-02-24

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Abstract:
The upper-ocean circulation of the tropical Atlantic is a complex superposition of thermohaline and wind-driven flow components. The resulting zonally- and vertically-integrated upper-ocean meridional flow is referred to as the upper branch of the Atlantic Meridional Overturning Circulation (AMOC) - a major component and potential tipping element of the global climate system. We investigate the tropical part of the northward AMOC branch, i.e. the return flow covering the upper 1,200 m, based on Argo data and repeated shipboard velocity measurements. The western boundary mean circulation at 11°S is realistically reproduced from high-resolution Argo data showing a remarkably good representation of the vertical structure of meridional velocity and the volume transport of water mass layers when compared to results from direct velocity measurements along a repeated ship section. Thus, we extend the analysis to the inner tropical Atlantic. Within the AMOC return flow, a diapycnal upwelling of central water into the thermocline layer of ~2 Sv is derived between 11°S and 10°N which is about half the magnitude of previous estimates, likely due to improved horizontal resolution. The mean strength of the AMOC return flow is ~16 Sv across 11°S and 10°N. At 11°S, northward transport is concentrated at the western boundary where the AMOC return flow enters the tropics at all vertical layers above 1,200 m. At 10°N, northward transport is observed both at the western boundary and in the interior predominantly in the surface and intermediate layer indicating recirculation and transformation of thermocline and central water within the tropics.
Keyword(s):
currents; physical oceanography; tropical Atlantic
Supplement to:
Tuchen, Franz Philip; Brandt, Peter; Lübbecke, Joke; Hummels, Rebecca (accepted): Transports and pathways of the tropical AMOC return flow from Argo data and shipboard velocity measurements. Journal of Geophysical Research, https://doi.org/10.1029/2021JC018115
Project(s):
Benguela Niños: Physikalische Prozesse und langperiodische Variabilität (BANINO)
Tropical and South Atlantic climate-based marine ecosystem predictions for sustainable management (TRIATLAS)
Funding:
Horizon 2020 (H2020), grant/award no. 817578: Tropical and South Atlantic climate-based marine ecosystem predictions for sustainable management
Coverage:
Median Latitude: 1.674487 * Median Longitude: -28.964810 * South-bound Latitude: -53.144700 * West-bound Longitude: -70.909100 * North-bound Latitude: 53.563960 * East-bound Longitude: 18.434600
Date/Time Start: 1990-10-06T16:05:00 * Date/Time End: 2019-11-19T00:00:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
46 datasets

Datasets listed in this editorial publication

  1. Brandt, P; Czeschel, R (2019): ADCP current measurements during METEOR cruise M145. https://doi.org/10.1594/PANGAEA.899170
  2. Brandt, P; Czeschel, R; Krahmann, G et al. (2019): ADCP current measurements (38 and 75 kHz) during METEOR cruise M106. https://doi.org/10.1594/PANGAEA.901421
  3. Brandt, P; Czeschel, R; Schütte, F et al. (2017): ADCP current measurements (38 and 75 kHz) during METEOR cruise M119. https://doi.org/10.1594/PANGAEA.877375
  4. Brandt, P; Funk, A; Körtzinger, A et al. (2017): ADCP current measurements during POLARSTERN cruise ANT-XXVI/4. https://doi.org/10.1594/PANGAEA.877354
  5. Brandt, P; Funk, A; Krahmann, G (2017): ADCP current measurements (38 and 75 kHz) during Maria S. Merian cruise MSM18/2. https://doi.org/10.1594/PANGAEA.877352
  6. Brandt, P; Funk, A; Krahmann, G (2017): ADCP current measurements (38 and 75 kHz) during METEOR ruise M80/1. https://doi.org/10.1594/PANGAEA.877364
  7. Brandt, P; Funk, A; Macke, A et al. (2017): ADCP current measurements during POLARSTERN cruise ANT-XXVI/1. https://doi.org/10.1594/PANGAEA.877355
  8. Brandt, P; Hahn, J; Czeschel, R et al. (2017): ADCP current measurements during POLARSTERN cruise PS88.2 (ANT-XXX/1.2). https://doi.org/10.1594/PANGAEA.877353
  9. Brandt, P; Hummels, R; Visbeck, M et al. (2021): ADCP current measurements (38 and 75 kHz) during METEOR cruise M159. https://doi.org/10.1594/PANGAEA.937680
  10. Brandt, P; Krahmann, G (2017): Lowered ADCP data during METEOR cruise M119. https://doi.org/10.1594/PANGAEA.877351
  11. Brandt, P; Krahmann, G (2020): Lowered ADCP data during METEOR cruise M145. https://doi.org/10.1594/PANGAEA.915873
  12. Brandt, P; Vogt, M; Krahmann, G (2017): ADCP current measurements (38 kHz) during METEOR cruise M81/1. https://doi.org/10.1594/PANGAEA.877359
  13. Brandt, P; Zenk, W; Funk, A et al. (2017): ADCP current measurements during POLARSTERN cruise ANT-XXV/5. https://doi.org/10.1594/PANGAEA.877357
  14. Dengler, M; Czeschel, R; Krahmann, G (2019): ADCP current measurements (38 and 75 kHz) during METEOR cruise M130. https://doi.org/10.1594/PANGAEA.904389
  15. Dengler, M; Krahmann, G (2020): Lowered ADCP data during METEOR cruise M130. https://doi.org/10.1594/PANGAEA.915871
  16. Dengler, M; Krahmann, G (2021): ADCP current measurements (38 and 75 kHz) during METEOR cruise M148. https://doi.org/10.1594/PANGAEA.937657
  17. Fischer, T (2015): ADCP current measurements during Maria S. Merian cruise MSM18/3. https://doi.org/10.1594/PANGAEA.844007
  18. Krahmann, G (2013): Lowered ADCP data during L'ATALANTE cruise ATA_IFMGEOMAR/4. https://doi.org/10.1594/PANGAEA.811565
  19. Krahmann, G (2013): Lowered ADCP data during METEOR cruise M80/1. https://doi.org/10.1594/PANGAEA.811718
  20. Krahmann, G (2015): Lowered ADCP data during Maria S. Merian cruise MSM18/2. https://doi.org/10.1594/PANGAEA.846777
  21. Krahmann, G (2015): Lowered ADCP data during Maria S. Merian cruise MSM22. https://doi.org/10.1594/PANGAEA.846763
  22. Krahmann, G (2016): Lowered ADCP data during METEOR cruise M53/2. https://doi.org/10.1594/PANGAEA.869651
  23. Krahmann, G (2016): Lowered ADCP data during METEOR cruise M62/2. https://doi.org/10.1594/PANGAEA.869655
  24. Krahmann, G (2016): Lowered ADCP data during METEOR cruise M106. https://doi.org/10.1594/PANGAEA.869634
  25. Krahmann, G (2016): Lowered ADCP data during SONNE cruise SO151. https://doi.org/10.1594/PANGAEA.869645
  26. Krahmann, G (2016): Lowered ADCP data during SONNE cruise SO170. https://doi.org/10.1594/PANGAEA.869641
  27. Krahmann, G (2017): Current velocity measured at PEGASUS stations during METEOR cruise M14/2. https://doi.org/10.1594/PANGAEA.873335
  28. Krahmann, G (2017): Current velocity measured at PEGASUS stations during METEOR cruise M16/3. https://doi.org/10.1594/PANGAEA.873388
  29. Krahmann, G (2017): Current velocity measured at PEGASUS stations during METEOR cruise M22/2. https://doi.org/10.1594/PANGAEA.873389
  30. Krahmann, G (2017): Lowered ADCP data during METEOR cruise M14/2. https://doi.org/10.1594/PANGAEA.873333
  31. Krahmann, G (2017): Lowered ADCP data during METEOR cruise M16/3. https://doi.org/10.1594/PANGAEA.873271
  32. Krahmann, G (2017): Lowered ADCP data during METEOR cruise M22/2. https://doi.org/10.1594/PANGAEA.873269
  33. Krahmann, G (2017): Lowered ADCP data during METEOR cruise M47/1. https://doi.org/10.1594/PANGAEA.873266
  34. Krahmann, G (2017): Lowered ADCP data during METEOR cruise M98. https://doi.org/10.1594/PANGAEA.873265
  35. Krahmann, G (2017): Lowered ADCP data during SONNE cruise SO152. https://doi.org/10.1594/PANGAEA.873261
  36. Krahmann, G (2017): Lowered ADCP data during SONNE cruise SO171. https://doi.org/10.1594/PANGAEA.873268
  37. Krahmann, G; Brandt, P; Hummels, R et al. (2022): Lowered ADCP data during METEOR cruise M159. https://doi.org/10.1594/PANGAEA.939896
  38. Krahmann, G; Burmeister, K; Dengler, M (2022): Lowered ADCP data during METEOR cruise M148/1. https://doi.org/10.1594/PANGAEA.939883
  39. Krahmann, G; Hummels, R (2017): ADCP current measurements during METEOR cruise M68/2. https://doi.org/10.1594/PANGAEA.874876
  40. Krahmann, G; Kopte, R (2015): ADCP current measurements during Maria S. Merian cruise MSM22. https://doi.org/10.1594/PANGAEA.841476
  41. Krahmann, G; Kopte, R (2016): ADCP current measurements (38 and 75 kHz) during METEOR cruise M98. https://doi.org/10.1594/PANGAEA.869656
  42. Müller, TJ; Krahmann, G (2017): ADCP current measurements during POLARSTERN cruise ANT-XXII/5. https://doi.org/10.1594/PANGAEA.877358
  43. Schott, FA (2005): Shipboard acoustic doppler current profiling during cruise M16/3 (SAC ID 00260). https://doi.org/10.1594/PANGAEA.319324
  44. Schott, FA (2005): Shipboard acoustic doppler current profiling during cruise M22/2 (SAC ID 00261). https://doi.org/10.1594/PANGAEA.319326
  45. Schott, FA (2005): Shipboard acoustic doppler current profiling during cruise M27/3 (SAC ID 00262). https://doi.org/10.1594/PANGAEA.319330
  46. Wallace, DWR; Schafstall, J; Krahmann, G (2017): ADCP current measurements (75 kHz) during METEOR cruise M55/1. https://doi.org/10.1594/PANGAEA.877591