Ann-Kristin Koehler

Ann-Kristin Koehler


Since Oct 2010 I have been a Research Fellow at the Institute for Climate and Atmospheric Science working on various projects.

Currently I am working on a SARIC (Sustainable Agriculture Research & Innovation) project led by the School of Biology and on the AMMA2050 (African Monsoon Multidisciplinary Analysis 2050) project. In SARIC I am researching the development of a potato cyst nematode (PCN) population advisory tool that provides robust advice for disease management. It follows on from a BBSRC funded project, in which I investigated the consequences of climate change for UK PCN pests.

In AMMA2050 we research the impact of climate change on crops in West Africa. I worked on how high temperature stress around flowering and CO2 fertilisation should best be included in the sorghum version of the General Large Area Model (GLAM) for annual crops.

Before these projects I worked on a CCAFS (CGIAR Research Program on Climate Change, Agriculture and Food Security) funded project researching effects of climate change on food security. During this time I did extensive research developing and using GLAM to simulate wheat in India. Since a large part of Indian wheat is irrigated, temperature is very important, rather than simply water availability, and I therefore focused on the uncertainty in temperature related processes in the crop model and the uncertainty from climate models and bias-correction of climate models. The uncertainty in the crop model can come from either the parameters or how a process is implemented in the model.

Another CCAFS funded project I contributed to showed that projected warming will reduce maize yields in Africa unless breeding and seed systems adapt immediately. I performed a time of emergence analysis using maize climate indices.

Alongside my main projects I have worked on other short funded projects (i) a project with a breeding company and an environmental consultancy researching how weather information could be used to improve the analysis of breeding trials, and (ii) a literature review on crop modelling for a large consumer-goods company.

Further I took part in the AgMIP-wheat (Agricultural Model Intercomparison and Improvement for wheat) project over multiple years. This allowed me to obtain good experimental data, which I used to improve and test the wheat version of the GLAM model. 

Apr 2007 - Apr 2010: PhD from University College Cork, Ireland which looked at the carbon balance of a blanket peat catchment. This involved measurements of net ecosystem CO2 exchange using the eddy covariance method, methane using the chamber method and dissolved organic carbon using a spectroanalyzer.

<h4>Research projects</h4> <p>Any research projects I'm currently working on will be listed below. Our list of all <a href="">research projects</a> allows you to view and search the full list of projects in the faculty.</p>


  • PhD Environmental Science, University College Cork,
  • Diploma Biomathematics, University of Greifswald

Research groups and institutes

  • Institute for Climate and Atmospheric Science
  • Climate Science and Impacts