Nathan Stevenard Portfolio

Email
nathan.stevenard@univ-grenoble-alpes.fr
Phone
+33 6 38 38 33 82
Birthday
June 7, 1995
Location

Grenoble, Isère, France

About me

I am a postdoctoral researcher in paleoclimatology at the Institute of Environmental Geosciences (IGE) in Grenoble. My research focuses on reconstructing past ocean circulation patterns and climate variability through the analysis of marine sediment cores and climate model simulations.

I completed my PhD at Paris-Saclay University, where I studied the variability of Iceland-Scotland Overflow Water over the past 400,000 years. I am particularly passionate about investigating past interglacial periods to enhance our understanding of climate and ocean system dynamics under similar or warmer conditions than present day.

Research interests and skills

Proxy-Based Ocean Reconstructions

Analysis of marine sediment cores using a variety of proxy (geochemistry, paleomagnetism, mineralogy and grain-size).
Paleoclimate Data Compilation & Harmonization

Searching, preprocessing, harmonizing, and compiling multi-source paleoclimate datasets.
Python-Based Data Analysis & Visualization

Developing advanced Python scripts and modules for scientific data analysis (Monte Carlo, machine learning pipelines, 4D dataset processing) and visualization.
Climate Modeling & Data Assimilation

Integrating paleoclimate data into numerical models to improve simulations (ongoing work).

Resume

Education

Paris-Saclay University (France)
2020 — 2023
PhD in Paleoceanography and Paleoclimatology.
University of Perpignan Via Domitia
2018 — 2020
Master's degree in marine sciences.
University of Angers
2015 — 2018
Bachelor's degree in environmental geosciences.

Experience

Postdoctoral Fellowship
2024 — Present
Compilation and analysis of sea surface temperature (SST) data across two past interglacials (MIS 7 and MIS 9), as part of the HOTCLIM project. Institute of Environmental Geosciences (IGE), Grenoble, France.
PhD Candidate
2020 — 2023
Reconstruction of Iceland–Scotland Overflow Water (ISOW) variability over the past 400,000 years, within the LEFE project “DECORATING”. Laboratory of Climate and Environmental Sciences (LSCE), Paris, France.
Marine Scientific Cruise – R/V Marion Dufresne
2023 (1 month)
Participated as a scientific team member in the AMARYLLIS–AMAGAS cruise aboard the R/V Marion Dufresne.
MSc Research Internship
2020 (5 months)
Reconstruction of Manson Icefield dynamics (Nunavut, Canada) since the Last Glacial Period, as part of the ArcticNet program. EPOC, Bordeaux, France.
MSc Research Internship
2019 (2 months)
Reconstruction of St. Lawrence River dynamics over the past 2,000 years. ISMER, Rimouski, Canada.

My skills

Data Compilation, Organization & Harmonization
90%
Laboratory Analysis of Marine Sediments
80%
Scientific Programming (Python)
70%
Scientific Communication & Outreach
70%
Climate Model Data Processing
40%

Publications

In Review / Preparation

Legrain, E. & Stevenard, N., Capron, E., Parrenin, F. & Vazquez Riveiros, N. The Marine Isotopic Stage 7: a relic of the « 41-kyr world » ? Perspectives from a global-scale sea-surface temperature synthesis (in prep).
In Prep
Stevenard, N., Govin, A., Kissel, C., Swingedouw, D., Toucanne, S., & Bouttes, N. 800,000 years of deep North Atlantic bistability (in prep).
In Prep
Stevenard, N., Capron, É., Legrain, É., & Coutelle, C. (2025). Global and regional sea-surface temperature changes over the Marine Isotopic Stage 9e and Termination IV. EGUsphere, 2025, 1-42.Link to the article.
In Review

2024

Stevenard, N., Kissel, C., Govin, A., & Wandres, C. (2024). Deep north atlantic circulation strength: Glacial-interglacial variability over the last 400,000 years. Quaternary Science Reviews, 345, 109011. Link to the article.

2023

Stevenard, N. (2023). Dynamique de la circulation profonde en Atlantique Nord subpolaire au cours des derniers 400 000 ans (PhD Thesis, University of Paris-Saclay) Link to the thesis.
Stevenard, N., Govin, A., Kissel, C., & Van Toer, A. (2023). Correction of the IRD influence for paleo‐current flow speed reconstructions in hemipelagic sediments. Paleoceanography and Paleoclimatology, 38(3), e2022PA004500. Link to the article.

2022

Stevenard, N., Montero‐Serrano, J. C., Eynaud, F., St‐Onge, G., Zaragosi, S., & Copland, L. (2022). Lateglacial and Holocene sedimentary dynamics in northwestern Baffin Bay as recorded in sediment cores from Cape Norton Shaw Inlet (Nunavut, Canada). Boreas, 51(3), 532-552. Link to the article.