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SUMMARY:Reconstructing wintertime seawater pCO2 on the data-barren shelf o
 f the western Weddell Sea based on summertime bottom water measurements - 
 Elise Droste (University of East Anglia)
DTSTART:20250507T130000Z
DTEND:20250507T140000Z
UID:TALK229777@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:The dense waters formed on the broad shelf of the western Wedd
 ell Sea are a source of Weddell Sea Bottom Water (WSBW)\, which transports
  anthropogenic CO2 along the continental slope to the bottom of the ocean.
  Our updated time series shows a positive trend of carbon in WSBW. To unde
 rstand the drivers for this pathway for carbon sequestration\, we need to 
 understand the processes affecting carbon concentrations in shelf waters a
 t the time of dense water formation\, which is predominantly during sea ic
 e formation in winter. Unfortunately\, wintertime marine observations are 
 particularly scarce in the western Weddell Sea. We are therefore testing a
  method that reconstructs the seawater partial pressure of CO2 (pCO2) repr
 esentative of wintertime conditions in this dense-water formation region\,
  using carbonate chemistry observations made in WSBW in the summer. Result
 s suggest that atmospheric CO2 uptake is the main driver of increasing car
 bon in WSBW\, and thus that equilibration of surface seawater with the atm
 osphere is possible despite year-round sea ice cover in this region.
LOCATION:BAS Seminar Room 1
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