d 18 O Water Mass Tracer Studies RUSALCA
- Slides: 8
d 18 O Water Mass Tracer Studies RUSALCA 2004, 2009, 2012 Lee Cooper Jackie Grebmeier Dana Biasatti University of Maryland Center for Environmental Sciences
18 O/16 O 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 d 18 O O Analysis complete for 2004, 2009, 2012
Poleward depletion of heavy isotopes http: //web. sahra. arizona. edu
y-intercept for 0 salinity (d 18 O ~-21) is similar to Yukon River Bering Strait Salinity – d 18 O mixing line Salinity vs δ 18 O 23 25 27 29 31 33 0 -1 δ 18 OV-SMOW ‰ -2 Melted sea ice (spring) to left of regression line -3 -4 Brine influenced waters to right of regression line R 2 = 0. 7674 -5 -6 Runoff in Alaska Coastal Water Salinity psu Updated (2013) from Cooper et al. 2006, Arctic 59: 129 -141
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
Salinity and station information Nutrient data from bottles Our d 18 O data Example: 2004 Rusalca bottle file 2009 & 2012?
Sorry I was unable to come Hope you have a great meeting Cove Point, Chesapeake Bay