Find me at AGU!

H23D-1703: Investigating the Role of Hydrologic Residence Time in Nitrogen Transformations at the Sediment-Water Interface using Controlled Variable Head Experiments
Tuesday, 12 December 2017; 13:40 - 18:00 Poster Hall D-F
2017 Fall Meeting of the American Geophysical Union
Photo credit to Kamini Singha, left to right: Sinchan Roy Chowdury (MSU), Martin Briggs (USGS), Ashton Krajnovich (CSM), Farzaneh MahmoodPoor Dehkordy (UConn), Tyler Hampton (MSU)

Also check out other presentations from Team Microzones at AGU!!!

H23D-1709 Numerical Modeling of Anaerobic Microzones Development in Bulk Oxic Porous media: An Assessment of Different Microzone Formation Processes
Sinchan Roy Chowdhury
Tuesday, 12 December 2017  13:40 - 18:00 Poster Hall D-F

H14F-04 Investigating the development of less-mobile porosity in realistic hyporheic zone sediments with COMSOL Multiphysics
Farzaneh MahmoodPoorDehkordy
Monday, 11 December 2017  16:45 - 17:00 Rm 298-299

U23B-06 Hyporheic less-mobile porosity and solute transport in porous media
Farzaneh MahmoodPoorDehkordy
Tuesday, 12 December 2017  13:58 - 14:01 eLightning Area

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Project: Nitrate Processing at the SWI

Unlocking the Transient Storage Blackbox: Revealing the Role of Less-Mobile Porosity in Hyporheic Denitrification and Greenhouse Gas Production

 Derived Publications

Dehkordy FMP, Briggs MA, Day-Lewis FD, Singha K, Krajnovich A, Hampton TB, Zarnetske JP, Scruggs C & Bagtzoglou A (2019). Multi-scale preferential flow processes in an urban streambed under variable hydraulic conditions. Journal of Hydrology. 10.1029/2018WR022823
Hampton TB, Zarnetske JP, Briggs MA, Singha K, Harvey JW, Day-Lewis FD, Dehkordy FMP & Lane JW (2019). Residence time controls on the fate of nitrogen in flow-through lakebed sediments. Journal of Geophysical Research: Biogeosciences. 10.1029/2018JG004741

 Briggs MA, Day-Lewis FD, Dehkordy FMP, Hampton TB, Zarnetske JP, Scruggs C, Singha K, Harvey JW & Lane JW (2018). Direct observations of hydrologic exchange occurring with less-mobile porosity and the development of anoxic microzones in sandy lakebed sediments. Water Resources Research 54, 4714–4729. 10.1029/2018WR022823

Conceptual Model of a stream
hyporheic zone (Briggs et al., 2015)

Link to Zarnetske Lab Research Page

This project is broadly exploring denitrification at the surface-groundwater interface. Because of long residence times and ample supply of nutrients from surface waters, this interface is strongly reducing at depth/distance along flow-path, and favorable to denitrification. We are exploring whether biogeochemical or hydrologic conditions govern bulk function of this interface in reducing inorganic nitrogen, and what variations lead to export of nitrous oxide, a denitrification bi-product and potent greenhouse gas. This work is being coupled with numerical models of interface properties and geophysics to explore embedded less-mobile porosity quantity and structure.

Field site at Snake Pond on Cape Cod, MA
A rainy day on Cape Cod, from left to right: Farzaneh MahmoodPoor Dehkordy (UConn), Courtney Scruggs (UConn), Tyler Hampton, Erin Seybold (Duke), Jay Zarnetske, Martin Briggs, Kamini Singha

Field work Summer 2016 took place in a groundwater flow through lake on Cape Cod, MA, and piloted the controlled biogeochemical and hydrologic modifications, as well as the geophysical methods.

Field work during Summer 2017 took place in the Ipswich River watershed in MA, adjacent to the Plum Island LTER.

(Photo credit Kamini Singha) Sawmill Brook in
Burlington, MA. Left to right: Sinchan Roy 
Chowdhury (MSU),  Marty Briggs (USGS), 
Ashton Krajnovich (Mines), Farzaneh 
MahmoodPood Dehkordy (UConn), 
Tyler Hampton

Michigan State Students Sinchan
Roy Chowdhury and Tyler Hampton 
at Sawmill Brook.



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Project: Exploring the effect of carbon and DOM quality on SWI nitrogen cycling

Exploring changes in carbon reactivity and composition, and the effect on the fate of nitrate, at a stream sediment-water interface

This work was conducted to explore how dissolved organic carbon (DOC) derived from different organic matter sources degraded within the sediment water interface (SWI), and how its reactivity or 'lability' affected nitrogen cycling and denitrification products within the SWI. Field work consisted of push-pull experiments at Augusta Creek, in Hickory Corners, MI, and additional laboratory studies were conducted by Joe-Lee Cullin and undergraduate Rachel Geiger at Michigan State. This work was supported by a Kellogg Biological Station LTER Summer Research Fellowship and a GSA Summer Research Grant, as well as the NSF Research Experiences for Undergraduates Program.

Joe Lee-Cullin and Tyler Hampton
sampling during Push-Pull experiments 
in Augusta Creek, Summer 2017
Joe Lee-Cullin and Rachel Geiger
collecting flocculated organic matter 
from Augusta Creek for use in batch reactor
studies of DOM quality and reactivity
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Society for Freshwater Science Annual Meeting

I had a blast at my first professional society meeting: the Society for Freshwater Science annual meeting, in Raleigh NC! The society took a strong stance for improving the environment to foster a more inclusive and diverse membership, allowing us to work together to preserve freshwater diversity. The Michigan student membership made a big step up to help organize events for the meeting next year in Detroit, and to engage the student membership in the intervening year. I also got to pinch-hit a very successful talk, and present my first year's Masters research at the poster session. Meeting so many role models and hearing so much awesome science has me riding high into the summer field season!

Stephen Plont and I both attended the society
Endowment Reception to accept awards
The MSU Green and White made a strong
showing at this year's poster session!


1,000 scientist mingle session!

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Zarnetske Lab members present at MSU Fate of the Earth Conference

Zarnetske Lab members Joe and Tyler presented posters at the MSU Fate of the Earth Conference, put on by the Environmental Science and Policy Program. Tyler presents on research from the 2016 summer field season at Snake Pond on Cape Cod, MA. Next stop for this research is the Society for Freshwater Science annual meeting in June!

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Zarnetske Lab does outreach at MSU SciFest




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Team Microzones travels to UConn on CUASHI travel grant

Zarnetske Lab and Microzones members Tyler and Sinchan received funding from the Consortium of Universities for the Advancement of Hydrologic Science to travel to collaborators at the University of Connecticut and USGS Geophysics Branch. They met with Microzones team members Dr. Martin Briggs and Dr. Fred Day-Lewis and students to train on traditional Darcy columns instrumented with electrical-resistivity probes (developed by project member Dr. Kamini Singha) to quantify bulk sediment properties. 

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