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SUMMARY:The Impacts of Freshwater Transport on the Weddell Gyre Carbon Bud
 get - Benjamin Taylor\, Scripps Institution of Oceanography
DTSTART:20250226T153000Z
DTEND:20250226T163000Z
UID:TALK228052@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:The Weddell Gyre mediates carbon exchange between the abyssal 
 ocean and atmosphere\, which is critical to global climate. This region al
 so features large and highly variable freshwater fluxes due to seasonal se
 a ice\, net precipitation\, and glacial melt\; however\, the impact of the
 se freshwater fluxes on the regional carbon cycle has not been fully explo
 red. Using a novel budget analysis of dissolved inorganic carbon (DIC) mas
 s in the Biogeochemical Southern Ocean State Estimate and revisiting hydro
 graphic analysis from the ANDREX cruises\, we highlight two freshwater-dri
 ven transports. Where freshwater with minimal DIC enters the ocean\, it di
 splaces DIC-rich seawater outwards\, driving a lateral transport of 75±5 
 Tg DIC/year. Additionally\, sea ice export requires a compensating import 
 of seawater\, which carries 48±11 Tg DIC/year into the gyre. Though often
  overlooked\, these freshwater displacement effects are of leading order i
 n the Weddell Gyre carbon budget in the state estimate and in regrouped bo
 x-inversion estimates. Implications for evaluating basin-scale carbon tran
 sports are considered. [Time permitting\, I’ll also share some results o
 n the role of heat addition in driving circulation change and warming patt
 erns in the Indian sector of the Southern Ocean.]
LOCATION:BAS Seminar Room 1\; https://bas-ac-uk.zoom.us/j/92446999952
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