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1. • Speech

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   Characterization of dissolved and particulate organic matter exported during late summer from a glacio-nival river, Zackenberg, Greenland

   Fouche Julien Hirst, Catherine[UCL] Opfergelt, Sophie[UCL] Vonk Jorien Bonneville Steeve Haghipour Negar Eglinton Timothy Broder Lisa (2020) EGU General Assembly 2020 — Virtual
2. • Speech

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   Update synthesis: The fate of organic carbon upon thaw also depends on interactions with mineral elements

   Opfergelt, Sophie[UCL] (2020) 10th Annual Meeting of the Permafrost Carbon Network — Virtual
3. • Speech

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   Waters in hydrothermal and polar environments: further developments for Si isotope measurements

   Opfergelt, Sophie[UCL] Gaspard, François[UCL] Hirst, Catherine[UCL] (2020) Goldschmidt conference — Virtual
4. • Speech

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   Integrating mineral interactions with organic carbon in thawing permafrost to assess climate feedbacks

   Opfergelt, Sophie[UCL] Hirst, Catherine[UCL] Monhonval, Arthur[UCL] Mauclet, Elisabeth[UCL] Thomas, Maxime[UCL] (2020) EGU General Assembly 2020 — Virtual
5. • Speech

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   Mineral element cycling through the soil-plant system upon permafrost thaw: case study in Interior Alaska

   Mauclet, Elisabeth[UCL] Hirst, Catherine[UCL] Monhonval, Arthur[UCL] Debruxelles, Laurentine[UCL] Ledman, Justin Taylor, Meghan Schuur, Edward A.G. Opfergelt, Sophie[UCL] (2021) ELI DAY — LLN - ONLINE ZOOM
6. • Speech

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   Contrasting silicon and magnesium isotope fractionation with clay mineralogy in volcanic soil weathering sequences, Guadeloupe

   Opfergelt, Sophie[UCL] Delvaux, Bruno[UCL] Georg, R.B. Cabidoche, Y.M. Burton, K.W. Halliday, A.N. (2011) Goldschmidt conference — Prague, Czech Republic
7. • Speech

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   Continental weathering and biological cycling: tracing with silicon isotopes

   Opfergelt, Sophie[UCL] (2012) Workshop on Weathering and Erosion (Ebelman’s meeting) — Académie des Sciences de Paris, Paris, France
8. • Speech

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   The evolving isotopic toolbox

   Opfergelt, Sophie[UCL] (2013) Gordon Research Conference - Catchment Science — Andover, NH, US
9. • Speech

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   The source of dissolved silicon in soil surface solutions of a temperate forest ecosystem: Ge/Si and Si isotope ratios as biogeochemical tracers

   Cornélis, Jean-Thomas[UCL] Delvaux, Bruno[UCL] Cardinal, Damien André, Luc Ranger , Jacques Opfergelt, Sophie[UCL] (2010) AGU Fall meeting — San Francisco, USA
10. • Speech

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    Cayambe volcano debris flow deposits (Ecuador): a particle-size distribution and mineralogical study

    Detienne, Marie[UCL] Delmelle, Pierre[UCL] Guevara Caiquetan, Alicia del Carmen[UCL] Samaniego, P Bustillos, J Sonnet, Philippe[UCL] Opfergelt, Sophie[UCL] (2014) SSSB Young Soil Scientist Day 2014 — Bruxelles
11. • Speech

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    Variations of delta30Si and Ge/Si with weathering and biogenic input in tropical basaltic ash soils under monoculture

    Opfergelt, Sophie[UCL] Cardinal , D. André , L. Delvigne , C. Bremond , L. Delvaux, Bruno[UCL] (2009) Department of Earth Sciences, University of Oxford — Oxford, UK
12. • Speech

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    A mineralogical and granulometric study of Cayambe volcano debris avalanche deposit

    Detienne, Marie[UCL] Delmelle, Pierre[UCL] Guevara, Alicia[UCL] Samaniego, P. Bustillos, J. Sonnet, Philippe[UCL] Opfergelt, Sophie[UCL] (2013) AGU Fall Meeting — San Francisco, CA, USA
13. • Speech

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    Impact of glacial climate on soil formation at the end of the Pleistocene, Ecuador

    Opfergelt, Sophie[UCL] Delmelle, Pierre[UCL] Duhain, Cédric[UCL] De Potter d'Indoye, A[UCL] Vera, R Yin, Q[UCL] Guevara Caiquetan, Alicia del Carmen (2016) International Conference on Permafrost ICOP2016 — Postdam, Germany
14. • Speech

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    The distribution of secondary mineral phases along an eroding hillslope ant its effect on carbon stabilization mechanisms and the fate of soil carbon fractions

    Doetterl, Sebastian Cornélis, Jean-Thomas[UCL] Opfergelt, Sophie[UCL] Boeckx, Pascal Bodé, Samuel Six, Johan Van oost, Kristof[UCL] (2014) EGU 2014 EUROPEAN GEOSCIENCES UNION — Vienna, Austria
15. • Speech

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    Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden)

    Villani, Maëlle[UCL] Hirst, Catherine[UCL] Lundin, Erik Giesler, Reiner Mörth, Magnus Opfergelt, Sophie[UCL] (2022) AGU Fall Meeting 2022 — Chicago, USA
16. • Speech

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    Evidence from silicon isotopes for pulses of sub-ice microbial activity during winter in the Lena River

    Opfergelt, Sophie[UCL] Gaspard, François[UCL] Hirst, Catherine[UCL] Monin, Laurence[UCL] Juhls, Bennet Morgenstern, Anne Overduin, Paul (2023) Goldschmidt 2023 — Lyon, France
17. • Speech

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    Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions

    du Bois d'Aische, Eléonore[UCL] Thomas, Maxime[UCL] Jonard, François Villani, Maëlle[UCL] Hirst, Catherine Giesler, Reiner Mörth, Carl-Magnus Opfergelt, Sophie[UCL] (2023) Arctic Science Summit Week — Vienne
18. • Speech

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    Coupling of geochemical and geophysical measurements to characterize iron and organic carbon co-mobility upon permafrost thaw in an Arctic peatland in Abisko, Sweden.

    du Bois d'Aische, Eléonore[UCL] Thomas, Maxime[UCL] Jonard, François Villani, Maëlle[UCL] Hirst, Catherine Giesler, Reiner Mörth, Carl-Magnus Lundin, Erik Opfergelt, Sophie[UCL] (2022) 7ème colloque climat et impacts — Paris-Saclay
19. • Speech

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    Tracking changes in iron organic carbon interactions upon permafrost thaw

    Opfergelt, Sophie[UCL] Monhonval, Arthur[UCL] Thomas, Maxime[UCL] (2023) Arctic Science Summit Week — Vienne
20. • Speech

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    Influence of rapid sea ice loss events on permafrost

    Osy de Zegwaart-Favart, Cécile[UCL] Massonnet, François[UCL] Opfergelt, Sophie[UCL] (2023) 6th European Conference on Permafrost — Puigcerdà
21. • Speech

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    Role of Dissolution-Precipitation of Mineral Organic Carbon Interactions on Carbon Loss and Gain upon Permafrost Thaw

    Opfergelt, Sophie[UCL] Monhonval, Arthur[UCL] Dailly, Hélène[UCL] Schuur, Edward Hirst, Catherine[UCL] (2022) AGU Fall Meeting 2022 — Chicago, USA
22. • Speech

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    Nanok Expedition: an ice triathlon in Greenland partnering with scientists for climate research

    Denis, Gilles Goffart, Nathan Opfergelt, Sophie[UCL] Bertrand, Bruno[UCL] Mattielli, Nadine Fettweis, Xavier Ahlstrom, Andreas P Defraigne, Pascale Bonneville, Steeve Boxho, Sibylle L. Box, Jason E Karlsson, Nanna B Bergeot, Nicolas[UCL] (2023) Goldschmidt 2023 — Lyon, France
23. • Speech

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    Tracing changes in mineral-organic carbon interactions upon permafrost thaw

    Opfergelt, Sophie[UCL] (2023) BrIAS Workshop 13 “Carbon and Climate Change – from the atmosphere to the bottom of the ocean” — Brussels
24. • Speech

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    Water residence time controls iron-organic carbon interactions in waters draining a sub-Arctic fen

    Hirst, Catherine Villani, Maëlle[UCL] Thomas, Maxime[UCL] Monhonval, Arthur[UCL] du Bois d'Aische, Eléonore[UCL] Lundin, Erik Giesler, Reiner Mörth, Magnus Opfergelt, Sophie[UCL] (2022) AGU Fall Meeting 2022 — Chicago, USA
25. • Speech

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    The Changing Arctic Critical Zone

    Opfergelt, Sophie[UCL] (2023) Circle U Thematic seminar: Climate & Water — Berlin

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