Details

Autor(en) / Beteiligte

• Su, Jiaoyang
• Schallenberg, Christina
• Rohr, Tyler
• Strutton, Peter G.
• Phillips, Helen E.

Titel

New Estimates of Southern Ocean Annual Net Community Production Revealed by BGC‐Argo Floats

Ist Teil von

• Geophysical research letters, 2022-08, Vol.49 (15), p.n/a

Ort / Verlag

Washington: John Wiley & Sons, Inc

Erscheinungsjahr

2022

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• Using an expanding Southern Ocean fleet of biogeochemical Argo (BGC‐Argo) floats, we developed a novel approach to estimate annual net community production (ANCP) by integrating subsurface oxygen drawdown from all available BGC‐Argo oxygen profiles. Our results suggest that, on average, 14% of remineralization occurs between 500 and 1,000 m and 15% occurs between the euphotic depth and 100 m. Using the improved methodology, we estimated total basin‐integrated ANCP in the Southern Ocean to be 3.89 GT C year−1 suggesting a more important role for the Southern Ocean in regulating oceanic carbon storage, atmospheric CO2 exchange and climate than previously assumed. Plain Language Summary Annual net community production (ANCP) is the amount of biologically produced carbon available for export to the deep ocean. We developed a novel approach to estimate ANCP in the Southern Ocean, using robotic floats. Using our improved method, total basin‐integrated ANCP in the Southern Ocean was 3.89 GT C year−1. These higher estimates could suggest a more important role for the Southern Ocean in regulating oceanic carbon storage, atmospheric CO2 exchange and climate than previously thought. Key Points A novel approach was developed to estimate annual net community production (ANCP) by integrating oxygen drawdown from all available biogeochemical Argo oxygen profiles Total basin‐integrated ANCP in the Southern Ocean was 3.89 GT C year−1 We found 15% of measured dissolved oxygen drawdown occurred above 100 m, but below the euphotic zone, and 14% occurred below 500 m