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Seminar: Snowmelt and Storm Events: Biogeochemical and Hydrological Responses

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Title: Seminar: Snowmelt and Storm Events: Biogeochemical and Hydrological Responses


1
SeminarSnowmelt 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
The Archer Creek catchment and instrumentation
5
Arbutus Watershed
6
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
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12
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)

d15Nx (15N/14N)x / (15N/14N)air 1
1000 d18Ox (18O/16O)x / (18O/16O)std 1
1000
13
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.

14
Soil groundwater
General trends of 18-O and 15-N values of nitrate
15
Results of nitrate samples taken during snowmelt
at Archer Creek Catchment, Huntington Forest
16
Episodic Acidification
  • Mitchell, M.J. Episodic Acidification. In Jay H.
    Lehr (ed). Encyclopedia of Water. John Wiley and
    Sons Publishing (In Press).

17
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18
Biscuit Brook Catskill Mountains New York
19
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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