Sergei Katsev


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


      

CURRICULUM VITAE RESEARCH
PUBLICATIONS
STUDENTS
LINKS
TEACHING
Curriculum Vitae Research Publications Students Links Teaching




    
NSF
Lake Matano (Indonesia):

Ancient ocean biogeochemistry and unusual hydrodynamics in a unique meromictic lake 
Publications:
Jones et al. (2011) Biogeochemistry of manganese in ferruginous Lake Matano, Indonesia. Biogeosciences 8: 2977-2991. (PDF)
Crowe et al. (2011) The methane cycle in ferruginous Lake Matano. Geobiology 9: 61-78 (PDF).
Katsev et al. (2010) Mixing and its effects on biogeochemistry in persistently stratified, deep, tropical Lake Matano, Indonesia. Limnology&Oceanography 55: 763-776 (PDF).
Crowe et al. (2008) Photoferrotrophs thrive in an Archean Ocean analogue. Proc. Nat. Acad. Sci. (PNAS) 105: 15938-15943. (PDF)
Crowe et al. (2008) The biogeochemistry of tropical lakes: A case study from ancient Lake Matano, Indonesia. Limnology&Oceanography 53, 319-331.

Funding:
NSF EAR 06-563 Collaborative research: Lake Matano, Indonesia: A modern observatory of ancient ocean biogeochemistry, $65,984.

Media:


Lake Matano, on the Sulawesi Island of Indonesia, is one of the most unique lakes in the World. At almost 600 m deep, it is the 7th deepest lake on the planet.  Only the upper 100 m, however, can exchange substances like oxygen with the atmosphere, so the water below 100 m is permanently anoxic. What makes it unique are the high concentration of dissolved iron in those deep waters and extremely transparent surface waters, which allow light penetrate to the oxic-anoxic boundary 100m below the lake surface. This combination, as well as significant accumulation of dissolved methane in those isolated deep waters, led to a unique habitat that hosts unusual microbial consortia. The biogeochemical reactions in the illuminated chemocline of Lake Matano may shed light (pun intended) on the biogeochemistry of the Earth's Archean ocean (2.5 billion years ago), when the ocean waters were warm, anoxic, and rich in dissolved iron.

The metabolic rates of Lake Matano organisms strongly depend on the rates at which the reactants and products are transported vertically in the water column of the lake by slow mixing of water. Those physical transport rates are controlled by the stability of the lake stratification. We termed the particular situation in Lake Matano "thermogenic meromixis", as permanent stratification is maintained by the temperature gradient alone, with only insignificant contribution from salinity - a rather unique situation as well!

Temperature profiles in Lake Matano Lake Superior sediment oxygen penetration
The temperature in Lake Matano stays constant below 100 m depth Mixing in Lake Matano simulated by Elcom model: internal wave amplitudes and dispersion of tracer






  


Boat on Matano

A local boat converted into research vessel on Lake Matano