Carbon Cycle Impacts and Feedbacks on Ocean Biogeochemistry
Including Fridtjof Nansen Medal Lecture
Co-organized by BG4
Convener:
Richard Sanders
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Co-conveners:
Mebrahtu Weldeghebriel,
Yael Kiro,
Netta Shalev,
Michael A. St. John
Orals
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Wed, 17 Apr, 08:30–12:30 (CEST) Room L3
Posters on site
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Attendance Wed, 17 Apr, 16:15–18:00 (CEST) | Display Wed, 17 Apr, 14:00–18:00 Hall X4
Posters virtual
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Attendance Wed, 17 Apr, 14:00–15:45 (CEST) | Display Wed, 17 Apr, 08:30–18:00 vHall X5
The ocean biological pump stores enough CO2 in the ocean interior to keep atmospheric pCO2 200ppm lower than it would otherwise be, with the depth at which this storage occurs being a key determinant of the size of this effect. This storage results from the surface production and interior respiration of organic matter, however, the transfer between surface and interior, and hence the depth at which remineralization occurs is driven by a wide array of processes including sinking, active fluxes, packaging of material by grazing, egestion and likely affected by plankton community composition and temperature. Understanding the relative importance of these processes is key to predicting the response of ocean biological C storage to climate change and human exploitation. The current intensification of human exploitation impacts on the ocean coupled with climate change is driving multiple projects (e.g. Ocean ICU, BioCarbon, Apero and Exports) to address these issues with the general objective of better predicting the evolution of future ocean C storage.
Ocean chemistry is linked to both short- and long-term C cycles via alkalinity input, saturation of carbonate minerals, and transfer of organic and inorganic C from the surface to the deep ocean. The sources and sinks of different elements and isotopes dictate their concentrations and isotope ratios in the ocean. Weathering and transport in rivers and reactions at mid-ocean ridges are major sources of elements to the ocean, while reactions with seafloor basalt, precipitation, scavenging, and adsorption onto particles are major sinks. These processes have also an important role in the C cycle. For example, silicate weathering removes CO2 and volcanism provides CO2 to the atmosphere over the long-term, and elements, such as Fe and Cd, are scavenged by the biological pump. Thus, studying oceanic geochemical budgets constrained by multiple isotope systems (e.g., δ11B, δ26Mg, δ30Si, δ88/86Sr) and concentrations (e.g., Fe, Sr, Ba, Li, S), and their variation over time, provides a useful tool in constraining the carbon cycle.
08:30–08:35
5-minute convener introduction
08:35–08:45
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EGU24-19534
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On-site presentation
08:55–09:05
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EGU24-7103
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On-site presentation
09:05–09:25
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EGU24-13608
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ECS
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solicited
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Highlight
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On-site presentation
09:25–09:35
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EGU24-4178
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On-site presentation
09:35–09:45
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EGU24-18309
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ECS
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On-site presentation
09:45–09:55
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EGU24-16921
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On-site presentation
09:55–10:05
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EGU24-16877
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ECS
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On-site presentation
10:05–10:15
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EGU24-9768
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ECS
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On-site presentation
Coffee break
Chairpersons: Richard Sanders, Michael A. St. John
10:45–10:50
Introduction to second session
10:50–11:00
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EGU24-12166
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ECS
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On-site presentation
11:00–11:10
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EGU24-723
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ECS
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On-site presentation
11:10–11:20
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EGU24-4985
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ECS
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On-site presentation
11:20–11:30
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EGU24-12043
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ECS
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On-site presentation
11:30–11:40
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EGU24-9848
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On-site presentation
11:40–11:50
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EGU24-13592
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Virtual presentation
11:50–12:00
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EGU24-7805
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ECS
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On-site presentation
12:00–12:30
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EGU24-2879
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solicited
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Highlight
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Fridtjof Nansen Medal Lecture
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On-site presentation
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X4.38
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EGU24-19681
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ECS
Carbon cycling and environmental transitions: insights from sediment core analyses in sepetiba bay mangrove
(withdrawn after no-show)
X4.41
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EGU24-6054
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Highlight
X4.46
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EGU24-18479
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ECS
X4.47
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EGU24-22422
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ECS
X4.49
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EGU24-10926
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ECS
Visualizing the Biological Carbon Pump: carbon export and attenuation in the North Atlantic using Underwater Vision Profilers.
(withdrawn)