Research team

Current group members

Dr Matthew P. Humphreys

Tenure-track scientist at NIOZ Texel in the Department of Ocean Systems (OCS) since November 2019. Interested in the changing biogeochemistry of the modern ocean, with a focus on CO2. Conducts ocean-going, observation-based research alongside theoretical studies of the marine carbonate system and develops related scientific software. Previously based in the UK at the universities of Cambridge (undergrad), Southampton (PhD and postdoc), and East Anglia (postdoc). »Google Scholar »NIOZ profile »
Louise Delaigue

PhD student at NIOZ Texel in the Department of Ocean Systems (OCS) since February 2020. My project explores blindspots in the marine carbon cycle with a focus on how the ocean responds to increasing anthropogenic CO2 emissions, especially in under-sampled regions such as the southern Indian and Pacific Oceans. I use scientific programming to investigate new measurements in combination with already existing datasets. MSc from McGill University (Canada).

@LouiseDelaigue »Google Scholar »NIOZ profile »
Yasmina Ourradi

PhD student at NIOZ Texel in the Department of Ocean Systems (OCS) since August 2021. My research project aims at exploring and better understanding the human impact, especially infrastructure development such as offshore wind farms, on the carbonate system (mainly the pH) in the North Sea. The project is carried out through a combination of laboratory studies and high-resolution autonomous CO2 system sensors that will be deployed in the Sea. MSc from the Mediterranean Institute of Oceanography (France).

@YasmineOurradi »NIOZ profile »
Ben Cala

PhD student at NIOZ (Texel) and Utrecht University since February 2022. After jumping from organometallic and computational chemistry during my BSc at the University of Tübingen (Germany) to atmospheric chemistry at Cambridge University (UK), I now ended up in chemical oceanography. I am interested in the dissolution of calcium carbonate in the water column. Specifically, my project aims to identify drivers of dissolution apart from the saturation state, through field and lab experiments as well as modelling approaches.

@ben_a_cala »NIOZ profile »
Job Thijssen

Masters student from the VU Amsterdam studying CO2 system changes around methane seeps in the North Sea.

Anne Roozendaal

Masters student from Utrecht University studying anthropogenic CO2 uptake in the South Atlantic Ocean.

Open positions

Postdoctoral researcher

We are now recruiting for a 3-year postdoc both as part of the NoSE project! Please see the Working at NIOZ site for more information and to apply, and don’t hesitate to get in touch if you have any questions.

Masters projects

If you are looking for a Masters-level research project in the Netherlands related to our work, please get in touch!


NIOZ Texel

Masters research students from various Dutch universities supervised at the NIOZ since 2021.

Simen Bootsma

University of Twente

Guided research: Computation of global calcium carbonate dissolution from diapycnal alkalinity transport (co-supervised by Sjoerd Groeskamp)

Irene Rollingswier

Vrije Universiteit (VU) Amsterdam

Masters thesis: Predicting the marine carbonate system in the surface of the Southern Bight of the North Sea: based on extreme gradient boosting models

Cecile Hilgen

Utrecht University

Guided research: The carbonate system on the long-term in the Dutch coastal zone: ocean acidification in reverse?

Abigail Schiller

Vrije Universiteit (VU) Amsterdam

Guided research: Effects of seawater composition on the dissociation of carbonic acid

Hanna van de Mortel

Utrecht University

Guided research: Seasonal and inter-annual variability of pH and relevant biogeochemical cycles along the Dutch coastal zone

Alisha Combee

Vrije Universiteit (VU) Amsterdam

Masters thesis: Ocean acidification and air-sea CO2 exchange in the Dutch North Sea

University of Southampton

Masters research students supervised by Matthew Humphreys from 2011 to 2017 at the University of Southampton.

Dr Alex Griffiths

Since completed PhD at Imperial College London

Accumulation of anthropogenic carbon and acidification of Northeast Atlantic water masses

Charlotte Miskin-Hymas

Now marine data manager at the British Oceanographic Data Centre

Variability of marine carbonate chemistry in the Benguela upwelling region, South Atlantic

Qiu Shuang

Controls on the equatorial Pacific as a source of CO2 to the atmosphere using data from the Surface Ocean CO2 Atlas (SOCAT)

Florence Greatrix

The stable isotope composition of dissolved inorganic carbon and anthropogenic CO2 uptake in the subpolar North Atlantic during summer 2014

Yang Yifei

Multi-decadal changes in interior carbonate chemistry in the South Atlantic

Li Xue

The northwest European continental shelf in the Surface Ocean CO2 Atlas (SOCAT)

Harriet Compton

Surface carbonate chemistry in the Chukchi Sea, Arctic Ocean

Rebecca Hampshire

Latitudinal gradients in surface ocean CO2 chemistry across the subtropical North Atlantic Ocean

Dr Jan-Lukas Menzel Barraqueta

Now postdoc at Stellenbosch University, South Africa

Marine carbonate chemistry and nutrients on the Extended Ellett Line transect, Northeast Atlantic Ocean