Sergei Katsev

Associate Professor • Large Lakes Observatory & Department of Physics • University of Minnesota Duluth


Curriculum Vitae Research Publications Students Links Teaching

   Research interests

Sediment geochemistry, coupling of hydrodynamic and biogeochemical processes, large lakes as analogues of modern and ancient oceans, permanently stratified lakes, East African Great Lakes, Lake Superior.


Directions and projects

R/V Blue Heron
Lake Superior: Sediment geochemistry.

Dynamics of carbon, oxygen, and nutrients in sediments with extremely deep oxygen penetration.

Lake Matano
Lake Matano: an early Ocean analogue

A unique anoxic lake in Indonesia contains high concentrations of dissolved iron and hosts microbial communities similar to those that might have dominated oceans 2.5 billion years ago.

Lake Kivu
Lake Kivu (Rwanda): a unique and dangerous lake

Possibly the most unusual lake in the World,  Lake Kivu contains enormous amounts of dissolved gases in its deep waters that are both a economic blessing and a grave danger.

Lake Malawi
Lake Malawi (East Africa): dynamics of nutrients

Lake Malawi is the major source of protein for the country of Malawi and it is under an increasing stress from growing population and agriculture.

Coastal hypoxia
Coastal marine hypoxia.

Oxygen depletion in estuaries and coastal areas is a growing problem caused by nutrient pollution, shifts in circulation, and warming.

December 2016. A paper in JGLR explains why even large lakes respond quickly to reductions in external P inputs, and explains how the corresponding time scales and eventual P concentrations
can be estimated quickly.

September 23, 2016. Our paper in PNAS points to a way to forecast microbiomes in the ocean and stratified lakes, by linking geochemical and microbial "omics" modeling. See also  UBC
press release and here.

August 2016. The contribution of sediments to phosphorus cycling in lakes is reviewed in a
book chapter published by Taylor&Francis. 

December 2015. A
story in the EARTH magazine highlights our Geology paper. See also UMD press release and the original story.

May 2015. Our paper in Geology describes how the decomposition rates of organic carbon in freshwater follow a simple power law as a function of carbon age and demonstrates how burial efficiencies in sediments can be theoretically predicted for modern and ancient oceans. 

May 2015. A paper by Sundby et al. is published that investigates when Mn-rich layers in the Arctic Ocean may become modified within the sediment on glacial-interglacial time scales. 

March 2015. A paper by Dittrich et al. characterizes the geomicrobiology of Fe-rich layers in Lake Superior

November 11, 2014. UMD homepage highlights our research

November 6, 2014. Our paper in Science suggests low concentrations of sulfate in the ancient oceans seawater. See also the
press release and the Science editorial.

October 2014. Our paper documents the warming of surface and deep waters of Lake Kivu.

September, 2014. Mojtaba Fakhraee started his Ph.D. 

August 2014. A Mac version of the diagenetic model
LSSE-Mega is available.  

On August 15, 2014, a master class on sediment geochemistry and diagenetic modeling was given at the University of Western Australia.   

On August 12, 2014, a public lecture on African Lakes was given at the University of Western Australia.   

June 30, 2014. Jiying Li has defended her Ph.D. thesis on sediment geochemistry in lakes Superior and Malawi.  

June 2014. The graphical user interface for the sediment diagenesis model LSSE-Mega is updated and available for download.  

January 2014. Research cruise on Lake Malawi. Redeployed moorings, obtained water samples. One of the immediate research goals is to identify causes of recent fish kills and the future responses of the lake to changing climate and land use.  

December 2013. Our new paper on the N cycle in Lake Superior balances the previously enigmatic nitrogen budget for the lake  and suggests ways of estimating denitrification in the abyssal ocean.

August 2013. Arthur Aaberg defended his M.Sc. thesis.

Media presentation by Amy Kireta featuring our team on Blue Heron.

March 2013. Fieldwork on Lake Kivu. Recovered a set of gravity cores. Obtained temperature record from 355 m depth.

Our session at IAGLR 2013: African Great Lakes in Transition.

December 2012. Matt Kistner has defended his M.Sc. project.

September 2012 Field trip to Lake Kivu.