1. BNL INL Lateral Transport of Dissolved and Particulate TEIs at Ocean Margins K2-NW Pacific % Transmission Along Line W 228 Ra

2. Attributes of Line W as a GEOTRACES section Detailed hydrographic template within which to interpret geochemical profiles (proposed PO program to run until 2013). Frequency of cruises between Woods Hole and Bermuda facilitate re-occupation of stations along transect (Process studies? GEOTRACES Intercalibration Station?). Intersects with planned ORION/IOOS PIONEER program designed to characterize shelf-slope processes on NW Atlantic margin. Intersects major components of MOC (DWBC and Gulf Stream). Sharp, well-defined contrasts in water mass source/age/history. High productivity margin. Significant and distinct lateral particle fluxes in intermediate and bottom nepheloid layers. Prior and on-going sediment trap studies. Ideal for studies of elemental boundary scavenging. Potential western limb of an east-west transatlantic GEOTRACES section that interests major particle flux time- series stations. http://www.whoi.edu/science/PO/linew/index.htm

3. PIONEER Array, Line W, and the Northeast Regional Coastal Ocean Observing System Line W Pioneer Array Deep Western Boundary Current

4. On-going and planned physical oceanographic measurements along Line W (J. Toole et al.) Moorings: Fixed instruments (moorings 2,4,6) -T/C sensors - Vector averaging current meters (VACMs) Moored Profilers (MMPs, moorings 1,3,5) - CTD - ADCP - Optical backscatter - Transmissometry (proposed) 123456 Hydrographic survey cruises: - CTD - Nutrients - Dissolved O2 - I-129 - CFCs/SF 6 - Optical backscatter + transmissometry

5. (Joyce et al., 2005) Composite mean property sections (1995 and 2006) along Line W. Average, net southward DWBC transport across Line W is estimated to be 16 Sv.

6. Recent and proposed biogeochemical flux studies on Line W Sediment traps

7. Line W (mooring @ 3000 m isobath) The Northwest Atlantic Margin is characterized by high mass fluxes! Global variations in mass fluxes for particles intercepted by sediment traps deployed within or below the mesopelagic zone

8. Line W Mooring deployment timelines (past and proposed) Spring 2004 Spring 2005 Spring 2006 Spring 2007 Spring 2008 3000 m Trap mooring PO moorings Proposed WHOI funded NSF-CO funded NSF-PO funded WHOI funded Toole proposal 2000 m Trap mooring 4700 m Trap mooring Spring 2009 Spring 2010 Proposed Toole proposal Spring 2012 Possible Toole proposal Spring 2011 Proposed Spring 2013 Proposed

9. An E-W transatlantic GEOTRACES section? Line W Bermuda OFP ESTOC

10. PO measurement program consists of a moored array spanning the continental slope plus annual/semi-annual (spring and fall) hydrographic survey cruises http://www.whoi.edu/science/PO/linew/index.htm Line W

11. Rasmussen (2003)

12. The NW Atlantic Margin: A Productive, dynamic and spatially heterogenous system Three-day composite satellite SST (left) and chlorophyll concentration (right) for 18-20 June 2001.

13. Turbidity sensor measurements from MMP deployed at 3000 m (Station W) Jan 30, 2005