1 / 9

Isotope mass balance – Mica Creek

Department of Forest Resources – University of Idaho, Moscow USA. Isotope mass balance – Mica Creek. Paul Koeniger, Tim Link, John Marshall. 03/28/2006 – Mica Creek Group Meeting. What we plan to do …. . . . . . .

ira
Download Presentation

Isotope mass balance – Mica Creek

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Department of Forest Resources – University of Idaho, Moscow USA Isotope mass balance – Mica Creek Paul Koeniger, Tim Link, John Marshall 03/28/2006 – Mica Creek Group Meeting

  2. What we plan to do …       Combination of watershed hydrology and isotope techniques for an isotopic mass balance in forested watersheds - Snow sampling / spring snowmelt - Base flow sampling - Water vapour - evaporation vs. transpiration (- Isotopes as applied tracers: soil water-xylem-transpiration) Isotope hydrological mass balance (Mica creek): P*CP = (E*CE + T*CSW) + R*CR + GWr*CSW {+/-DSW*CSW} C: Isotope concentration P: precipitation R: runoff E: evaporation T: transpiration GWr: groundwater (recharge) SW: soil water

  3. Isotopes inprecipitation: available data IAEA (2001).  GNIP Maps and Animations, Accessible at http://isohis.iaea.org Bowen (2003).  Accessible at http://www.waterisotopes.org

  4. Isotopes in precipitation • Three to 5 sampling points • in monthly resolution (altitude effect) • - Reference station in Moscow (weekly) • Snow sampling campaign in winter • Event sampling

  5. Isotopes in snow • Altitude effect in snow • Spatial variability • Snow profiles • Spring snowmelt event

  6. Clearwater River / Spalding Stream flow Isotopes in stream flow:available data? (Coplen and Kendall 2000: U.S. Geological Survey Open-File Report 00-160)

  7. Stream flow • Continuous (monthly) sampling at 3 to 5 locations • (control site, partial-, clear cut) • Event sampling – residence time distributions • Base flow • “ Isotope hydrological and hydro chemical characterization of base flow at Mica creek” – best in Sept. / Oct. 2006 • - Salt dilution discharge measurements • - 18O, 2H (and 3H/3He or 3H) • - Conductivity, pH, chloride, water chemistry

  8. Evaporation – transpiration – water vapor isotopes • Soil water • Continuously - should represent transpiration • Transpiration • Xylem • Water labeling of sap flow: • with 18O possibilities for in situ equilibration techniques ?? • with 2H – sugar exchange?? • Evaporation • Water vapor collecting techniques

  9. Conclusions • Water balance components are crucial for isotope mass balance • Isotopes in precipitation: reference station in Moscow -> regionalization • Isotopes in stream flow, soil water, xylem: sampling is ongoing • Isotopes in snow: results are soon to come … • Evaporation / transpiration component is probably the biggest challenge

More Related