Alexandra Auderset
@alexauderset
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Anniversary Fellow at University of Southampton | Paleoclimatologist | Foram-bound d15N & d13C | Biomarkers | Cenozoic climate | Foram ecology | GO VEGAN!
Southampton, UK
Joined April 2020
Nevertheless, this new approach to studying symbiosis offers a novel pathway to reconstruct paleo-symbiosis in extinct foraminifera—an essential piece of information for interpreting numerous geochemical proxies.
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However, we also show that this relationship can be more complex in regions with strong environmental gradients, where additional factors influence nitrogen isotopes.
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In this study we show that foraminifera-bound nitrogen isotopes (FB-δ15N) distinguish between symbiont-bearing and symbiont-barren foraminifera. FB-δ15N shows a clear signal of dinoflagellate symbiosis and may even identify other symbionts like chrysophytes or pelagophytes.
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Nitrogen isotopes are a promising tool to reconstruct symbiosis in planktic foraminifera! Check out our latest paper: https://t.co/6YlsV6ckci
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Great first two days at the #PAGES_PO2_workshop in Bristol with interesting talks about FB-N-isotopes by Alfredo Martínez-García, thallium isotopes by Yi Wang and ocean oxygenation models by Juan Muglia and Katrin Meissner (so captivating that even pigeons attended the session!)
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Funded PhD opportunity at @OceanEarthUoS, @unisouthampton: "Ancient climate change as a driver of ocean (de)oxygenation and marine ecology” Come work with me, @RichardStockey, @climategordon and Paul Wilson! More info about the project: https://t.co/9ddeZ68gaO Closes 8 Jan 2025
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Fully-funded 4 year PhD to study CO2 release from sedimentary rocks during past warm climates. Work with me, @RichardStockey, @TMGernon + @bjwmills. Due to funding restrictions, UK-based students only. Deadline 17.10.24. Start date flexible. Please RT.
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Why do we care? Nitrogen fixation supplies the ocean with bioavailable nitrogen, which is a crucial nutrient for many organisms. So to better understand how Nitrogen fixation works and changes through time is a big plus! :)
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Why is that? Shelf sedimentary denitrification supplies waters with proportionally higher amounts of phosphorous (vs. N) to the ocean, fuelling N-fixation. Glacials -> low sea level -> subaerial shelves -> low sedimentary denitrification -> low P supply to gyre -> low N-fixation
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What did we find? We found a reduction in N-fixation in the Atlantic Ocean during ice ages that is proportional to sea-level variations in regional shelf areas.
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What did we do? We measured foraminifera-bound nitrogen isotopes to reconstruct open ocean Nitrogen fixation over glacial/interglacial cycles.
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Nitrogen isotope paper published in Paleoceanography and Paleoclimatology with @rogercreel, @anjastuder, @amg_lab and many more! https://t.co/wh0ChFZ9Co
agupubs.onlinelibrary.wiley.com
Reduction of nitrogen fixation in the Atlantic Ocean during ice ages, proportional to sea-level variations in regional shelf area Regional coupling between nitrogen fixation and shelf sedimentary...
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📢We will have our 1st workshop "Ice sheets, ocean oxygenation, and the carbon cycle: Constraining changes in seawater oxygenation during the late Quaternary" 🗓️on November 11-13 in Bristol (UK) + online💻To register & more information visit https://t.co/aYyAtUFbFS
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First joint @MicropalaeoSoc and @CushmanFdn Foram meeting kicking off now with fab @alexauderset
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🚨Paper alert🚨 Our work on late Cenozoic climate structuring foram communities is out in @Nature Was a wholesome experience working with @foradamifera (who explains the paper beautifully in thread below) @macromicropaleo @OrbulinasDad & BillFagan @UMDscience
#networks #climate
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And thanks to those of you who came and listened to my talk! The room was so packed it almost felt like an oxygen deficient zone :D
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Forgot to advertise my talk at @egu24, but if you want to chat about foram-bound nitrogen isotopes, oxygen dynamics across the Cenozoic or just catch up, send me an email to arrange a meeting! Will be around until Saturday :)
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New paper alert! Give it a read if you're interested in lipid biomarkers, paleoclimate, lakes and their sediments, Dansgaard-Oeschger events, or climate of the last glacial period. https://t.co/ipKcBlUFZL with @MaxPlanckChem @alexauderset @AMG_lab
cp.copernicus.org
Abstract. Millennial-scale climate variations during the last glacial period, such as Dansgaard–Oeschger (DO) cycles and Heinrich events, have been extensively studied using ice core and marine proxy...
New research article: Reconstruction of warm-season temperatures in central Europe during the past 60 000 years from lacustrine branched glycerol dialkyl glycerol tetraethers (brGDGTs)
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If you plan to go to @goldschmidt2024 this year, please consider submitting an abstract to our Session 13g! Keynote speaker: Sze Ling Ho (National Taiwan University) Deadline approaching fast: 29th of March https://t.co/eMrKb7NNUX
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Read press release here:
mpic.de
Increased oxygenation of the tropical ocean during a geological episode of abrupt global warming.
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