Published September 25, 2022 | Version 1.0
Software Open

Global reorganization of deep-sea circulation and carbon storage after the last ice age

Creators

  • 1. University of California Irvine, Irvine, CA, USA
  • 2. Laboratoire des Science du Climat et de l'Environnement (LSCE/IPSL), Université-Paris-Saclay, Gif-sur-Yvette, France
  • 3. Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA
  • 4. University of St. Andrews, St. Andrews, Scotland, UK
  • 5. Institute of Geosciences, Kiel University, Kiel, Germany
  • 6. University of California Santa Cruz, Santa Cruz, CA, USA
  • 7. Oregon State University, Corvallis, OR, USA
  • 8. Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266237, China
  • 9. California Institute of Technology, Pasadena, CA, USA
  • 10. Department of Geography and Earth Research Institute, University of California, Santa Barbara, CA, USA

Description

This uses the dataset stored at PANGAEA: https://doi.pangaea.de/10.1594/PANGAEA.946522

Abstract from the paper: Using new and published marine fossil radiocarbon (14C/C) measurements—a tracer uniquely sensitive to circulation and air-sea gas exchange—we establish several benchmarks for Atlantic, Southern, and Pacific deep-sea circulation and ventilation since the last ice age. We find the most 14C-depleted water in glacial Pacific bottom depths, rather than the mid-depths as they are today, which is best explained by a slowdown in glacial deep-sea overturning in addition to a “flipped” glacial Pacific overturning configuration. These observations cannot be produced by changes in air-sea gas exchange alone, and they underscore the major role for changes in the overturning circulation for glacial deep-sea carbon storage in the vast Pacific abyss, and the concomitant drawdown of atmospheric CO2.

Notes

The "step0" file updates the age model of sites using planktic foram 14C to the Intcal20 dataset, assuming the Marine20 reservoir age model. Sites north of 40N or south of 40S need an additional reservoir age added, which is added via the "Delta.R" column. See main text for more details. The "step1" file of this code (written for R) estimates the binned average and standard error plus the loess trends for deep-sea 14C/C for the past 25,000 years BP. The "step2" file makes a simple plot of the data.

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