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SUMMARY:Biologically processed carbon drives the annual marine carbon sink
  over centuries after CO2 emissions cease
DTSTART:20260415T111500Z
DTEND:20260415T123000Z
DTSTAMP:20260418T153400Z
UID:indico-event-1050@events.geomar.de
CONTACT:office-fb2@geomar.de
DESCRIPTION:Speakers: Wolfgang Koeve (GEOMAR\, BM)\n\nAbstractPhysical-che
 mical uptake has dominated the ocean‘s uptake of carbon since preindustr
 ial times. However\, it remains unclear how the ocean carbon uptake will e
 volve after emissions cease and which mechanisms will drive these changes.
  Here we use Earth System models to study the evolution of the annual grow
 th rate of the marine carbon uptake under ambitious CO2 mitigation scenari
 os that achieve net zero CO2 emissions within the upcoming decades. With n
 et zero emissions\, we find a rapid shift of the processes that govern the
  growth rate of marine carbon uptake. The physical- chemical uptake of ant
 hropogenic CO2 decreases in response to decreasing atmospheric CO2. In con
 trast to the decreasing physical- chemical uptake\, we observe a growing r
 elevance of carbon uptake attributable to the biological carbon pump (DICr
 emin). The time elapsed between turning net-zero and when marine carbon up
 take is dominated by biological pump carbon (δDICremin > 0.5*δDIC) scale
 s with cumulative CO2-emissions since pre-industrial times. For scenarios 
 with global warming targets of around +1.5°C\, this point may be reached 
 already around the turn of this century.Exploring further what drives the 
 increasing contribution of the biological carbon pump\, i.e.\, the ‘gain
 ’ versus the ‘loss’ side (Frenger et al.\, 2024\, https://doi.org/10
 .1111/gcb.17124) of DICremin\, we find in output from CMIP6 models (Wilson
  et al.\, 2022\, https:// doi.org/10.1073/pnas.2204369119) that the increa
 se in the biological pump carbon is driven by an overall slowing down of t
 he ocean circulation leading to less re-emergence of DICremin at the ocean
  surface and a higher accumulation of DICremin below the surface ocean. Th
 is increase in DICremin is partly offset by a projected decrease in the ex
 port of organic matter into the interior ocean.\nSeminar linkhttps://geoma
 r.webex.com/geomar/j.php?MTID=ma522f5f4b0af40855947a88dcf5482d3\n\nhttps:/
 /events.geomar.de/event/1050/
LOCATION:5-1.213 - PAZIFIK / PACIFIC- Rechte Seite - Großer\, unterteilba
 rer Konferenzraum (GEOMAR - Standort Ostufer  / GEOMAR - East Shore)
URL:https://events.geomar.de/event/1050/
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