1. Tracer Hydrography in the Canadian Archipelago & Baffin Bay Part I: Nutrients Kelly K. Falkner, Kumiko Azetsu-Scott, Eddy Carmack E. Peter Jones, Robie Macdonald, Fiona McLaughlin Chris Measures, Humfrey Melling, Andreas Muenchow Mary O’Brien, Karen Selph, Peter Strain

2. Surface Circulation Sill depths in m Davis Strait 675 Barrow Strait 125 Cardigan Strait 180 Hell Gate 125 Kane Basin 220 Fury and Hecla 90 Davis St F&H Barrow Card&Hell Kane

3. 1916-2003 Hydrographic Data Analysis Zweng, M.M. and A. Münchow (2005) Warming and Freshening of Baffin Bay, 1916-2003. J. Geophys. Res., in press. Zweng, M.M. (2004) Hydrography and climatological evolution of Baffin Bay, 1916-1999, MSc., University of Delaware, pp. 1-71

4. Depth (km) Significant warming below 600-m Significant freshening above 300-m Baffin Bay (67N-80N)

5. Jones, E. P., J. H. Swift, L. G. Anderson, M. Lipizer, G. Civitarese, K. K. Falkner, G. Kattner, F. McLaughlin and J. Olafsson (2003) Tracing Pacific water in the North Atlantic Ocean, Journal of Geophysical Research, 108(C4), 3116, doi:10.1029/2001JC001141. Arctic Ocean N-P Relationship

6. USCGC Healy Aug 2003

7. Baffin Bay Section: T-S-N* N* = (NO 3 - 16xPO 4 + 2.90 µM/kg)

8. Baffin Bay Section: N-P-O 2 -Si

9. Robeson Channel: T-S-%Pac

10. Robeson Channel: N-P-O 2 -Si

11. Smith Sound: T-S-%Pac

12. Smith Sound: N-P-O 2 -Si

13. CCGS Hudson Aug 1977

14. CCGS Louis S. St. Laurent Aug 1997

15. Central Baffin Bay Si

16. Smith Sound Si

17. Jones Sound

18. Lancaster Sound

19. Arctic oscillation index Blue line: cold season average Black line: 5 year running mean Index is 1000 mb height anomalies mapped onto leading EOF 1997-2000

20. From Häkkinen & Proshutinsky (2004) Freshwater content variability in the Arctic Ocean, JGR 109, C03051

24. Conclusions vis a vis Nutrients  Substantial interannual variability in sounds & upper Baffin Bay: rivals seasonal?  Significant along channel mixing occurs in straits  Denitrification evident in deep (>600 m) Baffin Bay & Hudson St  Changes in Arctic Ocean throughput possibly related to AO?