PP031
The Role of the Reactive Silica Cycle in Climate & Ocean Evolution
Session ID#: 252057
Session Description:
From subglacial environments to deep-ocean settings, reactive silica cycling plays a critical, and understudied, role in the co-evolution of the ocean-climate systems. In considering processes spanning from polymerization and nano-particle formation to burial, microbial diagenesis, and late diagenesis, this session invites abstracts that link silica explicitly or implicitly to carbon, nutrient, and trace element cycles across spatial (atomic-geomorphic facies) and temporal (e.g., past-modern-future) scales in support of the AGU 2025 theme of “Where Science Connects Us.” Experimental, observational, modeling, synthesis, and rumination (Schrödinger's cat) studies that can allow us to connect overarching biogeochemical principles between disciplines are welcome as we chart future directions. Extreme events and perturbations from laboratory to Earth-system scales that can elucidate kinetics are also encouraged. A gap in knowledge remains about the significant impact of microbial metabolisms and are also invited.
Co-Sponsor(s):
Index Terms:
1030 Geochemical cycles [GEOCHEMISTRY]
1041 Stable isotope geochemistry [GEOCHEMISTRY]
1050 Marine geochemistry [GEOCHEMISTRY]
4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: CHEMICAL]
Primary Convener: Shaily Rahman, University of Colorado Boulder, Geological Sciences, Boulder, United States
Conveners: Lizzy Trower, University of Colorado Boulder, Department of Geological Sciences, Boulder, United States, Brandi Kiel Reese, Dauphin Island Sea Lab, Dauphin Island, United States; University of South Alabama, Mobile, AL, United States and Jeffrey W Krause, Dauphin Island Sea Lab, Dauphin Island, AL, United States
Effect of Phosphorus Limitation on Photophysiology and Elemental Uptake by the Antarctic Sea Ice Diatom Fragilariopsis cylindrus (1874067)
Charlotte Raymond, Rice University, Houston, TX, United States, Margaret Baker, Rice University, BioSciences, Houston, United States, Sven Kranz, Rice University, Department of BioSciences, Houston, United States and Mark Torres, Rice University, Department of Earth, Environmental and Planetary Sciences, Houston, United States
Biogenic Silica accumulation in the Ross Sea shelf sediment (1931725)
Manab Dutta1, Kaitlyn Hall2, Kanchan Maiti2 and Philip J Bart3, (1)Louisiana State University, Baton Rouge, LA, United States, (2)Louisiana State University, Department of Oceanography and Coastal Sciences, Baton Rouge, United States, (3)Department of Geology and Geophysics, Louisiana State University, Baton Rouge, United States
Assessing the Potential of in situ Silicon Isotope Ratios as A Palaeo-Si Proxy in Recrystallized Sponge Spicules in Ediacaran-Cambrian Cherts (1951869)
Yan Ye1,2, Patrick Frings2, Daniel Frick3, Friedhelm von Blanckenburg4, Qinglai Feng5 and Daniel J Conley1, (1)Lund University, Department of Geology, Lund, Sweden, (2)Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany, (3)University of Kiel, Institute of Geosciences, Kiel, Germany, (4)Freie Universität Berlin, Berlin, Germany, (5)China University of Geosciences, School of Earth Science, Wuhan, China
Spatial Variation in Microbial Mediation of Marine Silica Sequestration During Early Diagenesis (1957359)
Lacey Bowman1, Panagiotis Michalopoulos2, Kendall Breland1,3, Priya Gilman1,3, Katharine Hendry4, Wei-Li Hong5, Kathryn Howe1,6, Brandi Kiel Reese1,6, Kanchan Maiti7, Rebecca A Pickering5, Ryan Roseburrough3, Eleni Rousselaki2, Martial Taillefert8 and Jeffrey W Krause3,9, (1)Dauphin Island Sea Lab, Dauphin Island, United States, (2)Hellenic Center for Marine Research, Anavyssos, Greece, (3)University of South Alabama, Mobile, United States, (4)NERC British Antarctic Survey, Cambridge, United Kingdom, (5)Stockholm University, Stockholm, Sweden, (6)University of South Alabama, Stokes School of Marine and Environmental Sciences, Mobile, United States, (7)Louisiana State University, Department of Oceanography and Coastal Sciences, Baton Rouge, United States, (8)Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, United States, (9)Dauphin Island Sea Lab, Dauphin Island, AL, United States
What is the Chemical Composition of Silica Produced by the Marine Cyanobacterium, Synechococcus? (1958406)
Heera Immandi, Arizona State University, Tempe, AZ, United States, Kayla Barnette, University of South Alabama, Mobile, United States, Lacey Bowman, Dauphin Island Sea Lab, Dauphin Island, United States, Alison Siersma, University of South Alabama, Stokes School of Marine and Environmental Sciences, Mobile, United States and Jeffrey W Krause, Dauphin Island Sea Lab, Dauphin Island, AL, United States
The effects of tropical cyclones on marine sediment organic matter in the Mississippi River plume (1961826)
Shannon Kille1,2, Lacey Bowman1, Kathryn Howe1,2, Brandi Kiel Reese1,3 and Jeffrey W Krause1,2, (1)Dauphin Island Sea Lab, Dauphin Island, United States, (2)University of South Alabama, Mobile, United States, (3)University of South Alabama, Mobile, AL, United States
Disentangling Effects on Porewater Silicon Isotope Signatures During Early Diagenesis (1963815)
Jeffrey W Krause1, Gregory F. de Souza2, Ryan Roseburrough3, Kathryn Howe4, Kendall Breland3, Priya Gilman3, Lacey Bowman4 and Brandi Kiel Reese5, (1)Dauphin Island Sea Lab, Dauphin Island, AL, United States, (2)ETH Zurich, Institute of Geochemistry and Petrology, Zurich, Switzerland, (3)University of South Alabama, Mobile, United States, (4)Dauphin Island Sea Lab, Dauphin Island, United States, (5)University of South Alabama, Stokes School of Marine and Environmental Sciences, Mobile, United States
Temporal Variability in Sediment Microbial Abundance in the Mississippi River Plume (1968812)
Priya Gilman1,2, Claire Puranananda3, Kathryn Howe1,2, Shaily Rahman3, Jeffrey W Krause2,4 and Brandi Kiel Reese1,2, (1)Dauphin Island Sea Lab, Dauphin Island, United States, (2)University of South Alabama, Stokes School of Marine and Environmental Sciences, Mobile, United States, (3)University of Colorado Boulder, Geological Sciences, Boulder, United States, (4)Dauphin Island Sea Lab, Dauphin Island, AL, United States
Extreme Weather Effects and Annual Trends in Sediment Biogenic Silica off the Louisiana Coast (1981055)
Kendall Breland1,2, Lacey Bowman2, Claire Puranananda3, Shaily Rahman3, Brandi Kiel Reese2,4 and Jeffrey W Krause1,5, (1)University of South Alabama, Mobile, United States, (2)Dauphin Island Sea Lab, Dauphin Island, United States, (3)University of Colorado Boulder, Geological Sciences, Boulder, United States, (4)University of South Alabama, Mobile, AL, United States, (5)Dauphin Island Sea Lab, Dauphin Island, AL, United States
Si Isotope Compositions in Porewaters Illustrate Reverse Weathering in the Gulf of Papua and Amazon-Guianas Deltaic Systems (1983637)
Indigo Heine, University of Colorado Boulder, Boulder, United States, Yisheng Yin, Nanjing University, Nanjing, China, Xin-Yuan Zheng, University of Minnesota Twin Cities, Department of Earth and Environmental Sciences, Minneapolis, United States, Lizzy Trower, Stanford University, Stanford, United States, Robert C Aller, SUNY StonyBrook, Stony Brook, United States and Shaily Rahman, University of Colorado Boulder, Geological Sciences, Boulder, United States
Beyond the Bedrock: How Water, Land, and Nutrients Reshape Dissolved Silicon Concentrations and Fluxes in Rivers (1983952)
Sidney A Bush1, Keira Johnson1, KathiJo Jankowski2, Joanna Carey3, Lienne Sethna4, Nicholas Lyon5 and Pamela L Sullivan1, (1)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, United States, (2)USGS Upper Midwest Environmental Sciences Center, La Crosse, United States, (3)Babson College, Math, Analytics, Science and Technology Division, Wellesley, United States, (4)St. Croix Watershed Research Station, Marine on Saint Croix, United States, (5)National Center for Ecological Analysis and Synthesis, LTER Network Office, Santa Barbara, United States
