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Robinson, C. ., University of East Anglia, Norwich, United Kingdom, carol.robinson@uea.ac.uk
Hardman-Mountford, N. ., Plymouth Marine Laboratory, Plymouth, United Kingdom,
Serret, P. ., University of Vigo, Vigo, Spain,
Kitidis, V. ., Plymouth Marine Laboratory, Plymouth, United Kingdom,
Tilstone, G. ., Plymouth Marine Laboratory, Plymouth, United Kingdom,
Loucaides, S. ., National Oceanography Centre, Southampton, United Kingdom,
Torres, R. ., Plymouth Marine Laboratory, Plymouth, United Kingdom,
Nightingale, P. ., Plymouth Marine Laboratory, Plymouth, United Kingdom,
Smyth, T. ., Plymouth Marine Laboratory, Plymouth, United Kingdom,
Stephens, J. ., Plymouth Marine Laboratory, Plymouth, United Kingdom,

THE IMPACT OF COASTAL UPWELLING ON THE CYCLING OF DISSOLVED OXYGEN AND CARBON DIOXIDE

Coastal upwelling regions significantly influence oceanic biogeochemistry and atmospheric chemistry through supply of water supersaturated with carbon dioxide, undersaturated in dissolved oxygen and rich in inorganic nutrients and photolabile dissolved organic matter (DOM). As part of the NERC UK SOLAS programme, we used sulphur hexafluoride and drifting buoys to follow an upwelled filament off the coast of NW Africa to determine how the cycling of dissolved oxygen and carbon dioxide is influenced by 1) the hydrography of the upwelling system, 2) the variability in plankton community structure and activity caused by supply of nutrient-enriched water, and 3) photodegradation of upwelled and recently produced DOM. The surface water signature of the upwelling plume was characterised by pCO2 concentrations > 600 µatm and dissolved oxygen saturations of 85%. Gross oxygen production ranged from 3 to 16 g C m-2 d-1, while photochemical breakdown of DOM released up to 0.3 g C m-2 d-1 and consumed up to 1.6 mmol O2 m-2 d-1.

Session #:S28
Date: 02-16-2011
Time: 13:30

Presentation is given by student: No