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NCP ( mmol O 2 m -2 d -1 )

The 45 th International Liège Colloquium 13 th – 17 th May 2013. NET ECOSYSTEM METABOLISM IN THE NW IBERIAN UPWELLING SYSTEM ON AN ANNUAL CYCLE C.G.Castro , Arbones B, Alvarez-Salgado XA, Alonso- Pérez F, Froján M, Zúñiga D, Teixeira IG, and Figueiras FG

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NCP ( mmol O 2 m -2 d -1 )

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  1. The 45th International LiègeColloquium 13th – 17thMay 2013 • NET ECOSYSTEM METABOLISM IN THE NW IBERIAN UPWELLING SYSTEM • ON AN ANNUAL CYCLE • C.G.Castro, Arbones B, Alvarez-Salgado XA, Alonso-Pérez F, Froján M, • Zúñiga D, Teixeira IG, and Figueiras FG • Instituto de Investigaciones Marinas (CSIC) NCP (mmol O2 m-2d-1) BP (mmol C m2d-1)

  2. Aristegui Background CAIBEX: Shelf –oceanexchanges in theCanaries- IberianLarge Marine Ecosystem Arístegui et al. 2009

  3. Background Upwellingindex (1987-2004) UPWELLING DOWNWELLING Courtesy of RMS from PML MONTH Courtesy of RMS from PML Northernboundary of theCanaryCurrentupwellingsystem Seasonalvariation: Upwelling: ApriltoSeptember Downwelling: OctobertoMarch Upwellingindex (103 m3 s-1 Km-1)

  4. E Background Highrates of primaryproductionduringtheupwellingperiod (2.5 g C m-2 d-1), dominatedbylarge – sizeddiatoms (Varela et al., 1991; Teira et al., 2001; Figueiras et al., 2001; Tilstone et al., 2003) Espinoza et al. 2012

  5. Objectives To study the fate of fixed carbon based on direct measurements of gross primary production, pelagic respiration and vertical export of organic matter and explore the linkage between Production / Respiration balance and size structure and composition of the microbial plankton community.

  6. Methods Courtesy of RMS from PML • SEAWATER SAMPLES for: • Nutrients • Size –fractionatedchlorophyll (0.2, 2, & 20 µm) • Pico-, Nano- and Microplanktonbiomass • Net CommunityProduction (NCP) and CommunityRespiration (CR) byin situ 24 ligh-darkbottleoxygenincubations • Net primaryproductionbyin situ 24 incubations of C14 • Bacterialproductionbyleucineuptake • Vertical fluxes of organiccarbonbyin situ 24h deployment of a multitrap

  7. Results Hydrographicconditions Upwellingindex (m3 s-1 Km-1) Temperature (°C) Nitrate (µmol kg-1) 2008 2009

  8. Results >20 μm >2 μm >0.2 μm 32% 57% Total chlorophylla (mg m-3) 76% 32% Primaryproduction (mg m-3 d-1) 2008 2009 2008 2009

  9. Results Microbialplanktonbiomass Integratedbiomass (mg C m-2) Pico- Nano- Micro- Sizeclass Contribution (%) 2008 2009

  10. Results Production / respiration balance NCP (mmol O2 m-3d-1) CR (mmol O2 m-3d-1) BP (mg C m-3d-1) 2008 2009

  11. Results Vertical CarbonFluxes Vertical CarbonFluxes (mg C m2d-1) 2008 2009 Organiccarbon Phytoplanktoniccarbon Diatomcarbon

  12. Conclusions NCP (mmol O2 m-2d-1) NCP (mmol O2 m-2d-1) BP (mmol C m2d-1) BP (mmol C m2d-1)

  13. Conclusions • 6 NCP (g C m-2 d-1) • 4 • 2 • 1 • 0.5 • 0 Autotrophicbiomass Heterotrophicbiomass

  14. Conclusions UPWELLING SEASON DOWNWELLING SEASON NCP 2.1 ±2.0 Respiration 0.9 ±1.0 NCP 0.5 ±0.5 Respiration 0.5 ±0.3 photic zone 50% 70% Carbon flux 0.29 ±0.02 Carbon flux 0.4 ±0.2 19% 58% aphoticzone Respiration 0.2 ±0.1 Respiration 0.07 ±0.03 50% 24% g C m-2 d-1

  15. Thank you for your attention

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