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Seminar: Snowmelt and Storm Events: Biogeochemical and Hydrological Responses

Seminar: Snowmelt and Storm Events: Biogeochemical and Hydrological Responses. Why study: Snowmelt and Storm Events. Provide information on physical and chemical attributes of catchments Important contributor to discharge and biogeochemical fluxes

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Seminar: Snowmelt and Storm Events: Biogeochemical and Hydrological Responses

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  1. Seminar:Snowmelt and Storm Events: Biogeochemical and Hydrological Responses

  2. Why study: Snowmelt and Storm Events • Provide information on physical and chemical attributes of catchments • Important contributor to discharge and biogeochemical fluxes • Events can have a major influence on physical, chemical and biological attributes of surface waters.

  3. Storm Event Example Inamdar, S., P., S. F. Christopher, and M. J. Mitchell. 2003. Export mechanisms for dissolved organic carbon and nitrate during summer storm events in a glaciated forested catchment in New York, USA. Hydrological Processes (In Press).

  4. N 748 m X G14 S1 630 m S2 570 m 634 634 m X Peatland with groundwater elevation well 580 m X 540 Scale H-Flume Instrumented hillslope with lysimeters & throughfall collectors 0 0.5 km Arbutus Contour interval 30 m Lake Wetlands/Peatlands Groundwater sampling well Streams The Archer Creek catchment and instrumentation

  5. Arbutus Watershed

  6. (a) (b) (c) (e) (d) Precipitation, streamflow, and solute concentrations for the Floyd storm events.

  7. Perceptual model for NO3- and DOC evolution considering water and solute contributions from deep and near-surface flow paths and spatial connectedness of saturated areas. Note: Arrow on the hydrograph (inset) indicates position of the stage during the event.

  8. Snowmelt Example Piatek, K.B., M.J. Mitchell, S.R. Silva and C. Kendall. 2003. Sources of nitrate in Adirondack surface water during dissimilar snowmelt events. (In review).

  9. Terminology • Changes in isotopic abundance are expressed as ratios of 15N/14N of sample to air or 18O/16O of sample to ocean water. • Units: per mil (o/oo) δ15Nx = {[(15N/14N)x / (15N/14N)]air –1} * 1000 δ18Ox = {[(18O/16O)x / (18O/16O)]std –1} * 1000

  10. Separation of nitrate sources using stable isotopes of nitrogen and oxygen • Nitrate has different stable isotopic values. • Atmospheric N-nitrate has 18-O values than N-nitrate derived from soil and ground waters.

  11. precipitation Soil + groundwater General trends of 18-O and 15-N values of nitrate

  12. Results of nitrate samples taken during snowmelt at Archer Creek Catchment, Huntington Forest

  13. Episodic Acidification Mitchell, M.J. Episodic Acidification. In: Jay H. Lehr (ed). Encyclopedia of Water. John Wiley and Sons Publishing (In Press).

  14. Biscuit Brook Catskill Mountains New York

  15. Goals of Seminar • Increase understanding of biogeochemical and hydrological responses of snowmelt and storm events • Exploration of literature on hydrology and biogeochemistry • Develop skills for oral presentations and discussions • Prepare for workshop to be held on Feb. 27, 2003 on “Snowmelt and Storm Events: Biogeochemical and Hydrological Responses”

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