Research Group


Sebastian Höpker


DSC03670Hi, I’m Seb. I obtained my undergraduate degree in Marine Science (BMarSc) at James Cook University, Australia, with a focus on physical and geochemical processes in the ocean and tropical coral reef systems.

My studies continued closer to home in northern Germany, where I completed my MSc in Marine Geosciences at the University of Bremen. I had the opportunity to carry out some exciting field and lab work throughout my studies, during which I developed a particular interest in looking at past and present climate variability based on the chemical composition of biogenic carbonates. In my MSc thesis I assessed the use of strontium isotopes in modern and archaeological bivalve shells and fish otoliths as a tracer for freshwater discharge in NW African estuaries, yielding new insights into the activity of the West African Monsoon System over the last 6,000 years.

For my PhD, supervised by Dr. Adam Hartland and Dr. Megan Grainger, I am now looking at developing a new speleothem hydroclimate proxy based on the interactions of trace metals in dripwater with organic ligands. The project will involve the establishment of cave monitoring programs in New Zealand and islands of the South Pacific, as well as carbonate growth experiments mimicking cave conditions in the lab at UoW. This novel type of proxy aims to allow for quantitative estimates of past cave drip rates derived from measured trace metal concentrations in speleothems, ultimately providing new information on recent and Holocene changes in the New Zealand and South Pacific hydroclimate. I’m excited to join this growing field of research, and am looking forward to exploring the stunning NZ outdoors in my spare time.

Gimhani Perera20200717_110811


Hi, I’m Gimhani and I am excited to be a part of the WEG group. I recently graduated with my masters in Environmental Sciences from the Chinese Academy of Sciences, Chongqing Institute of Green and Intelligent Technology. My studies focused on advanced membrane fabrication and the application of membrane-based desalination in understanding membrane fouling mechanisms and developing novel desalination technology. I obtained my BSc in Mineral resources and technology (sp. water science) at Uva Wellassa University, Sri Lanka. Here I will continue within the same themes, but also mainly focusing on the bioreactor project the group already has ongoing.

I am currently fortunate enough to be provided with the opportunity to work hand in hand with UoW and NIWA across various sectors of study. Under the supervision of Dr. Adam Hartland, Professor Louis Schipper, Dr. Dorrisel Torres-Rojas, and Dr. Rupert Craggs, I am undertaking a Ph.D. research project which aims to enhance phosphorous removal from agricultural subsurface drainage by activated bio media. This study will provide new perspectives on the biogeochemistry of denitrifying bioreactors by examining the interplay of redox processes which may affect P and it’s interaction with introduced biomedia.

I’ve long been involved in various science projects and research experiments, and I am passionate about traveling in my spare time. I’m pretty excited to soak up all I can from this experience and make some new friends along my Ph.D. journey.



Huma Saeed

2016-05-17 11.11.25


Thesis: Redox cycling of macro and micro-nutrients in a monomictic lake

Current position: Lecturer, Waikato College

Amir Mohammadi

Amir's paddle.jpg


Thesis: From soil to groundwater: assessing the leaching potential of cadmium across gradients of soil type and land use (submitted)

Current position: R&D Scientist, ScapeSpec (

Cinthya Nava FernandezCinthya Nava Fernandex


Thesis: Speleothem records of Pacific hydroclimate

Current position:

Thomas Corbett



Thesis: Quantification of Nitrate Concentrations and Determination of Flow Rates in Freshwater: Enhancement of the ‘Diffusive Gradients in Thin-films’ Methodology

Current position: Postdoc, Uppsala University

Andrew Pearson

Andrew PearsonEmail:

Thesis: The terrestrial carbon cycle in transition: tracking changes using novel tracers on multiple timescales

Current position: Senior Groundwater Scientist – ESR


Ingrid Lindeman

Ingrid 2


Thesis: Effects of Organic Matter Complexation on Partitioning of First Row Transition Metals Into Calcite: Cave-Analogue Crystal Growth Studies

Current position: Research Associate at Plant and Food Research

Chris Eager



Thesis: Biogeochemical Characterisation of an Alum Dosed Stream:
Implications for Phosphate Cycling in Lake Rotoehu (2017)

Current position: Coastal Technician, NIWA

BSc (Hons)

Jackson White



Dissertation: Quantifying condensation corrosion in the Glowworm Cave, Waitomo (2019)

Current position: PhD candidate, University of Queensland

Postdoctoral Researchers

Chris Wood (2020-2022)

Mahdiyeh Salmanzadeh (2018-2020)

Summer research project students

Ben Scarlet (2014), Jain Abraham (2015), Amy Shen (2016)

Undergraduate Research Students

Jackson White (2016), Katie O’Reilly (2017)

International Internship Students

Pierre Oesterle (2013)

Katrin Hattig, University of Bremen (PROMOS, 2018)


Martin Andersen, UNSW Connected Waters Initiative Research Centre. November-December 2014.

John Hellstrom, University of Melbourne, November 2015.

Chaoyong Hu, China University of Geosciences, January-July 2016.

Niklas Lehto, Lincoln University, April 2016.

Sebastian Breitenbach, Ruhr-Universität Bochum, September-October 2016.

Tihana Vujinovic, Lincoln University, June and October 2017.

Dharshika Welikala, Lincoln University, June 2017.

Mirona Chirienco, Okinawa Institute of Science & Technology, May-June 2017.

Andreas Holbach, Karlsruhe Institute of Technology (KIT), October – December 2017

Ry Farley, Vassar College, Poughkeepsie, New York, October – December 2017

Inken Heidke, Johannes Gutenberg University Mainz, December 2017 – January 2018

David Dominguez-Villar, Ruđer Bošković Institute, Zagreb, January- February 2018

Maximilian Hansen, Johannes Gutenberg University Mainz, April – May 2018

Bedartha Goswami, Potsdam Institute for Climate Impact Research, Sept – Nov 2018

Hauke Kraemer, Potsdam Institute for Climate Impact Research, Nov – Dec 2018

Sebastian Breitenbach & Ola Kwiecien, Ruhr-Universität Bochum, December 2018 -January 2019

Cinthya Nava Fernandez, Ruhr-Universität Bochum, January- March 2019

John Hellstrom, University of Melbourne, April 2019.

Anja Beschnitt, Johannes Gutenberg University Mainz, August-October 2019.

Marco Roth, Ruhr-Universität Bochum, October – November 2019.

Alena Giesche, University of Cambridge, October – December 2019.

Slide show of some of the visitors and students in our group

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