• Research Interests

The quantification of landform evolution and the understanding of the processes involved are essential to consider their implications for global biogeochemical cycles and climate-tectonic feedbacks.

In volcanic islands, the understanding of the erosion processes is important not only for a scientific purpose, but also for societal concerns. Tropical precipitation regimes allow erosion that creates dramatic landscapes and that can result in socio-economic and ecosystem damages.

My research is focused on the combination of geochemical and geomorphological methods, to estimate erosions rates and to understand erosion processes and controls.

Using:

• Cosmogenic isotopes (³He, ¹⁰Be)
• Paleo- topographies reconstructions (DEM manipulation)
• River geochemistry (major and traces elements, geochemical mass balance)
• Photogrammetry (historical aerial images)

Sites of interests

research ID : http://www.researcherid.com/rid/K-6836-2012

• Latest result : Precipitation variability as primary control on erosion

(please copy/paste the link lelow)

http://www.ipgp.fr/~egayer/Research_Reunion/

• Hot topic : Landslides and geochemistry of river

Landslide impact on chemical weathering in the volcanic island of Reunion. In this study we measured concentrations of total dissolved solids and major cations and anions in stream water and in landslide seepage water.

River "des pluies" drainage area.

• Teaching / Administrative Delegation

• Teaching 

- Cosmogenic Isotopes

- Introduction to radiogenic isotope geochemistry

- Introduction to stable isotope geochemistry

- Python for Geosciences

- Field trip "introduction to Geology"

• Administrative Delegation

- Head of Licence Science de la Terre et de l'Environement of Université Paris Diderot- UFR STEP (Bachelor degree)

- Board member of IPGP (elected 2012-2016, 2016-present)

• Previous positions

- Harvard University (2005-2007, coll. with Sujoy Mukhopadhyay)

- University of Edinburgh (2007-2008, coll with Tibor Dunai)

• Selected contributions

-Gayer, E et al. 2019. Storm-induced precipitation variability control of long-term erosion. Earth and Planetary Science Letters 517, pp. 61-70.

- Floury, P. et al., 2017. The potamochemical symphony: new progress in the high-frequency acquisition of stream chemical data. Hydrology and Earth System Sciences, 21(12), pp.6153–6165.

- Carretier, S. et al., 2015. A note on 10 Be-derived mean erosion rates in catchments with heterogeneous lithology: examples from the western Central Andes. Earth Surface Processes and Landforms, 40(13), pp.1719–1729.

- Carretier, S. et al., 2015. Differences in 10Be concentrations between river sand, gravel and pebbles along the western side of the central Andes. Quaternary Geochronology, 27, pp.33–51.

- Louvat, P., Gayer, E. & Gaillardet, J., 2014. Boron Behavior in the Rivers of Réunion Island, Inferred from Boron Isotope Ratios and Concentrations of Major and Trace Elements. Procedia Earth and Planetary Science, 10, pp.231–237.

- Moreira et al., 2009. Rare gases on off-axis seamounts: Constraints on the marble-cake model. , 73(13).

- Ammon, K. et al., 2009. Cosmogenic 3He exposure ages and geochemistry of basalts from Ascension Island, Atlantic Ocean. Quaternary Geochronology, 4(6), pp.525–532.

- Gayer, E., Mukhopadhyay, S. & Meade, B.J., 2008. Spatial variability of erosion rates inferred from the frequency distribution of cosmogenic 3He in olivines from Hawaiian river sediments. Earth and Planetary Science Letters, 266(3–4), pp.303–315.

- Gayer, E. et al., 2004. Cosmogenic He-3 in Himalayan garnets indicating an altitude dependence of the He-3/Be-10 production ratio. Earth and Planetary Science Letters, 229(1–2), p.91.