CC026
Understanding Long-term Drivers in the State of the Marine Carbonate System and the Biological Carbon Pump
Session ID#: 254316
Session Description:
Long-term changes in the oceanic carbonate system and the biological carbon pump are governed by a complex interplay of abiotic and biotic factors. Over millennial timescales, processes such as natural terrestrial weathering, deep-sea sediment interactions, and shifts in ocean temperature and atmospheric CO₂ concentrations significantly influence dissolved inorganic carbon and alkalinity in seawater. These changes, in turn, affect marine ecosystems and the functionality of the biological carbon pump, potentially preventing it from reaching a steady state.
This session aims to explore the key drivers that shape the marine carbonate system and the biological carbon pump over timescales exceeding 1,000 years. We invite contributions that examine long-term paleoceanographic records or biogeochemical feedbacks using numerical model simulations or data analyses to better understand the resilience and vulnerability of the marine carbon cycle. Special focus will be given to the role of changing phytoplankton communities, sedimentary processes, and climate-driven variations in weathering inputs. By highlighting these long-term dynamics, the session seeks to provide insights into both the past behavior and the future trajectory of the ocean’s carbon sequestration capacity under changing climatic conditions.
Co-Sponsor(s):
Index Terms:
0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0428 Carbon cycling [BIOGEOSCIENCES]
1622 Earth system modeling [GLOBAL CHANGE]
1630 Impacts of global change [GLOBAL CHANGE]
Primary Chair: Sina Acksen, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Co-chairs: Karin Kvale, Aotearoa Blue Ocean Research, Lower Hutt, New Zealand and Dominik Hülse, MARUM - University of Bremen, Bremen, Germany
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Brianna Hoegler1, Timothy Herbert1, Luc Beaufort2 and Clara T Bolton3, (1)Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States, (2)Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France, (3)Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix en Provence, France
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Hongrui Zhang1, Reto Simon Wijker2, Iván Hernández-Almeida3, Xiaolin Ma4, Thomas Tanner3, Heather M Stoll5 and Xingxing Wang6, (1)Tongji Univeristy, Shanghai, China, (2)ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland, (3)ETH Zurich, Zurich, Switzerland, (4)State Key Laboratory of Loess Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, (5)ETH Zurich, Department of Earth and Planetary Sciences, Zurich, Switzerland, (6)State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
