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Madeleine Bohlin

Madeleine Bohlin

Research assistant

Earth surface processes

Chemical weathering

River chemistry

Isotope geochemistry

M10 - Downing Site
CB2 3EQ
Office Phone: +44 (0) 1223 333441

Biography:

PhD, University of Cambridge, UK

MSc in Geology, Stockholm University, Sweden

BSc in Earth Sciences, Uppsala University, Sweden

 

Research Interests

I study the chemistry of river waters, suspended sediments and bedload sediments in the headwaters of the Ganges in the Garhwal Himalayas, NW India. Rivers act as conveyor belts, carrying eroded and chemically weathered material to the ocean. By consuming atmospheric CO2, the weathering of silicate minerals is intimately linked to the global carbon cycle and likely modulates the Earth’s climate on a geological time scale. As part of the Marie Curie Initial Training Network (ITN) “investigating Tectonism Erosion Climate Couplings” (iTECC), my research involves investigating the mechanisms and controls of chemical weathering in the Himalayas, and how weathering is coupled to erosion and climate.

To do this I use the stable isotopes of lithium and magnesium to trace weathering processes occurring in the Himalayan Mountains. Rivers in the Garhwal Himalayas provide a natural laboratory to test the controls on these reactions. To study the effect of tectonism on weathering, I am also investigating changes in river water chemistry in Nepal following the 2015 Gorkha Earthquake. I model my data with a 1-dimensional reactive transport model which quantifies the minimum number of controlling parameters on the resulting river water composition.

Further, I have developed a new method for trace level analysis of Li and Mg isotopes (down to 0.3 ng Li) which allows analysis of very dilute river waters and small sediment samples. 

 

Keywords

Geochemistry ; Stable isotopes

Key Publications

Bohlin, M.S., Misra, S., Lloyd, N., Elderfield, H. and Bickle, M.J., 2017. High precision determination of lithium and magnesium isotopes utilising single column separation and MC‐ICPMSRapid Communications in Mass Spectrometry. DOI: 10.1002/rcm.8020