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Analysis of d18O Water Mass Tracer Studies in RUSALCA 2004, 2009, and 2012

Explore the use of d18O water mass tracer to distinguish between freshwater derived from ice melt and runoff, and the influence of brine injection on salinity. Includes updated data from 2013 and challenges in station numbering.

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Analysis of d18O Water Mass Tracer Studies in RUSALCA 2004, 2009, and 2012

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  1. d18O Water Mass Tracer Studies RUSALCA 2004, 2009, 2012 Lee Cooper Jackie Grebmeier Dana Biasatti University of Maryland Center for Environmental Sciences

  2. 18O/16O • Water mass tracer • Distinguish between: • Freshwater derived from ice melt • Freshwater derived from runoff • Brine injection influences salinity more strongly than it affects d18O • Analysis complete for 2004, 2009, 2012

  3. Poleward depletion of heavy isotopes http://web.sahra.arizona.edu

  4. Bering Strait Salinity – d18O mixing line y-intercept for 0 salinity (d18O ~-21) is similar to Yukon River Melted sea ice (spring) to left of regression line Brine influenced waters to right of regression line Runoff in Alaska Coastal Water Updated (2013) from Cooper et al. 2006, Arctic 59:129-141

  5. Rusalca 2004 Freshwater intercept is more negative than in Bering Strait; consistent with Kolyma River and other East Siberian rivers

  6. Rusalca 2009 and 2012 sample isotope analysis has been completed • Inconsistency of station numbering and naming convention is posing challenges, e.g. repeat stations, multiple casts at same station • It would help to have a unified, sharable bottle file tabulating physical parameters at the time Niskins were closed. • Interpretation of 2009 and 2012 data is in progress

  7. Salinity and station information Nutrient data from bottles Our d18O data Example: 2004 Rusalca bottle file2009 & 2012?

  8. Sorry I was unable to comeHope you have a great meeting Cove Point, Chesapeake Bay

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