Prospective Postdoctoral Researchers and Graduate Students



Postdoctoral or PhD Position in Sulfur Hydrobiogeochemical Modeling at University of Minnesota-Twin Cities (Department of Earth and Environmental Sciences)


I am seeking a postdoctoral researcher or PhD student for a DOE-funded, collaborative project examining the interactions of hydrologic flux and coupled iron-sulfur-carbon cycling in riparian wetlands. Although compared to in marine settings, sulfur is not typically considered to be as important in land-based biogeochemical cycling, we are finding that it can undergo "cryptic" cycling that drives carbon and iron - elements clearly important for global cycles as well as for local contaminant fate and transport.


I am looking for a post-doc or PhD student to work mainly on computer modeling aspects of the project - specifically implementing and further developing a reactive transport model (computer codes that simulate both transport with flow and geochemical reactions). There will also be occasional group fieldwork (approximately 3-day long trips, about twice per year) at a field site in South Carolina (DOE’s Wetland Hydrobiogeochemistry Scientific Focus Area at the Savannah River Site) and possible opportunities to help with lab work if interested. The ideal candidate would have experience with computer programming (e.g., Matlab, Python, or similar), and in particular, previous exposure to reactive transport modeling.


The post-doc or PhD student would work as part of a collaborative team covering the areas of geochemistry, geomicrobiology, and hydrology/hydrogeology, including others at University of Minnesota and DOE scientists.


This position could be available as early as January 2020 and will hopefully be filled by September 2020.  Graduate applications to our department for Fall 2020 are due December 15 (link) (note that we no longer require the GRE).  


If you are interested in this opportunity, please contact me: Crystal Ng, with a CV and/or brief summary of your relevant background for this position. I will be at the AGU 2019 Fall Meeting, in case you would like to meet there.



Graduate Student Opportunities in Hydrological Modeling


I am always on the look-out for prospective masters and PhD students interested in joining a my research group working on integrated hydrological modeling in the Department of Earth and Environmental Sciences at the University of Minnesota - Twin Cities ( We employ numerical models to describe how different aspects of the earth system interact with the hydrologic cycle (e.g., vegetation, soil / sediments, climate, and geochemistry) in order to understand the impacts of climate change, land-use change, and contamination on water and ecological resources. We also incorporate data into these simulations to rigorously address uncertainties.


Students may develop projects with me on:

- Ecohydrological modeling of the interactions between vegetation dynamics and soil moisture movement between the land surface and groundwater aquifers. Projects may focus on the Mojave Desert, Minnesota field sites, or other locations with water resources concerns.

- Reactive transport modeling of contaminants and/or natural solutes as they move through aquifer sediments and interface with the unsaturated zone and surface waters. Applications may cover contaminant sites or biogeochemical cycling.

- Statistical method (data assimilation / inverse modeling / model calibration) development to combine field and/or remotely sensed data with numerical process models in ways that tackle computational challenges and non-linearity / non-Gaussianity. Field-oriented projects may address optimal observational designs.

- Interdisciplinary social and biophysical dimensions of hydrologic and related earth systems.  Read more here about my Tribally directed research project on wild rice aquatic ecosystems.


The University of Minnesota encompasses the Water Resources Science Program (, LacCore (, the Minnesota Geological Survey (, St. Anthony Falls Laboratory (, and the Institute on the Environment (


Interested students should have a desire to work on problems spanning diverse components of the earth sciences, come with strong quantitative and computational interests, and feel enthusiastic about working as part of a dynamic research team. Contact: Crystal Ng (