18 O Water Mass Tracer Studies RUSALCA 2004, 2009, 2012 Lee Cooper Jackie Grebmeier Dana Biasatti University of Maryland Center for Environmental Sciences O Water mass tracer O Distinguish between: O Freshwater derived from ice melt O Freshwater derived from runoff O Brine injection influences salinity more strongly than it affects 18 O O Analysis complete for 2004, 2009, O/ 16 O Poleward depletion of heavy isotopes Bering Strait Salinity 18 O mixing line Updated (2013) from Cooper et al. 2006, Arctic 59: Melted sea ice (spring) to left of regression line Runoff in Alaska Coastal Water Brine influenced waters to right of regression line y-intercept for 0 salinity ( 18 O ~-21) is similar to Yukon River Rusalca 2004 Freshwater intercept is more negative than in Bering Strait; consistent with Kolyma River and other East Siberian rivers Rusalca 2009 and 2012 sample isotope analysis has been completed O Inconsistency of station numbering and naming convention is posing challenges, e.g. repeat stations, multiple casts at same station O It would help to have a unified, sharable bottle file tabulating physical parameters at the time Niskins were closed. O Interpretation of 2009 and 2012 data is in progress Example: 2004 Rusalca bottle file 2009 & 2012? Our 18 O data Nutrient data from bottles Salinity and station information Sorry I was unable to come Hope you have a great meeting Cove Point, Chesapeake Bay