Sustained growth of the Southern Ocean carbon storage in a warming climate

Takamitsu Ito, Annalisa Bracco, Curtis Deutsch, Hartmut Frenzel, Matthew Long, Yohei Takano

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We investigate the mechanisms controlling the evolution of Southern Ocean carbon storage under a future climate warming scenario. A subset of Coupled Model Intercomparison Project Phase 5 models predicts that the inventory of biologically sequestered carbon south of 40°S increases about 18-34 Pg C by 2100 relative to the preindustrial condition. Sensitivity experiments with an ocean circulation and biogeochemistry model illustrates the impacts of the wind and buoyancy forcings under a warming climate. Intensified and poleward shifted westerly wind strengthens the upper overturning circulation, not only leading to an increased uptake of anthropogenic CO2 but also releasing biologically regenerated carbon to the atmosphere. Freshening of Antarctic Surface Water causes a slowdown of the lower overturning circulation, leading to an increased Southern Ocean biological carbon storage. The rectified effect of these processes operating together is the sustained growth of the carbon storage in the Southern Ocean, even under the warming climate with a weaker global ocean carbon uptake.

Original languageEnglish (US)
Pages (from-to)4516-4522
Number of pages7
JournalGeophysical Research Letters
Volume42
Issue number11
DOIs
StatePublished - Jun 16 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Keywords

  • climate change
  • CMIP-5
  • MITgcm
  • ocean carbon uptake
  • Southern Ocean

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