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Ecosystem composition and export production variability Corinne Le Quéré , Erik Buitenhuis, Christine Klaas Max-Planck-Institute for Biogeochemistry, Germany and Olivier Aumont Laboratoire de Dynamique du Climat et des Océans, France. climate feedback. OCEAN. CO 2 sink (PgC/y).

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1850

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  1. Ecosystem composition and export production variabilityCorinne Le Quéré, Erik Buitenhuis, Christine KlaasMax-Planck-Institute for Biogeochemistry, Germany and Olivier AumontLaboratoire de Dynamique du Climat et des Océans, France

  2. climate feedback OCEAN CO2 sink (PgC/y) LAND 1850 today 2100 Prentice et al., 2001

  3. 4 NPZD PISCES Dynamic Green Ocean Model (DGOM)

  4. SeaWiFS Chla (mgChl/m3)

  5. SeaWiFS NPZD PISCES DGOM Chla (mgChl/m3)

  6. Chla (mgChl/m3) Interannual standard deviation of Chla (%) SeaWiFS 50%

  7. Chla (mgChl/m3) Interannual standard deviation of Chla (%) SeaWiFS NPZD PISCES DGOM 50%

  8. Phytoplankton traits

  9. diatoms 70N cocco 0 nano 70S relative contribution Abundance of PFT (%) DGOM cocco nano diatoms

  10. Interannual standard deviation of chla per PFT (%) cocco nano diatoms

  11. Interannual standard deviation of chla per PFT (%) cocco nanno diatoms 5 PFTs 4 PFTs

  12. 1997 1998 1999 2000 2001 2002 2003 0.02 diatoms 0.1 coccolithophorids 1.5 nano phytoplankton Plankton-specific chla in the North Atlantic (40N-45N, mgChla/m3)

  13. diatoms 70N cocco 0 nano 70S relative contribution Abundance of diatoms (%) Uitz, Claustre et al., from an HPLC pigment and SeaWIFS Chla DGOM

  14. diatoms 70N cocco 0 nano 70S relative contribution Coccolithophorid bloom frequency Analysis from C. Brown DGOM

  15. Export Production (PgC/y) MEAN(Standard deviation)

  16. sensitivity of plankton biomass to nano nano grazing growth diatoms diatoms Meso-zoo Meso-zoo Cocco. Cocco. Micro-zoo Micro-zoo

  17. Conclusions • More complexity in marine ecosystems gives more variability in fluxes • More in line with observations • Mean spatial distribution in PFTs is critical to reproduce chl variability

  18. Phytoplankton traits

  19. Phytoplankton traits

  20. Zooplankton traits

  21. Zooplankton traits

  22. Impact of El Nino in % on Chla (full line from SeaWiFS) and export (dots from traps) POC CaCO3 Si sediment trap data base of C. Klaas

  23. Abundance of PFT (%) DGOM PISCES cocco nanno diatoms

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