Tracer Hydrography in the Canadian Archipelago & Baffin Bay Part I: Nutrients Kelly K. Falkner, Kumiko Azetsu-Scott, Eddy Carmack E. Peter Jones, Robie.

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Presentation transcript:

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

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

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

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

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: /2001JC Arctic Ocean N-P Relationship

USCGC Healy Aug 2003

Baffin Bay Section: T-S-N* N* = (NO xPO µM/kg)

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

Robeson Channel: T-S-%Pac

Robeson Channel: N-P-O 2 -Si

Smith Sound: T-S-%Pac

Smith Sound: N-P-O 2 -Si

CCGS Hudson Aug 1977

CCGS Louis S. St. Laurent Aug 1997

Central Baffin Bay Si

Smith Sound Si

Jones Sound

Lancaster Sound

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

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

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?