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Primary productivity in five coupled physical and biological

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Presentation on theme: "Primary productivity in five coupled physical and biological"— Presentation transcript:

1 Primary productivity in five coupled physical and biological
Models of the Arctic Ocean: does ice rule them all? Katya Popova, National Oceanography Centre, Southampton, UK F. Dupont (EC, Canada) M.Jin (Univ Alaska Fairbanks) E.Hunke (LANL) J. Zhang, M. Steele (Univ of Washington) A. Yool (NOCS, UK) 1

2 The main questions we try to answer:
How well different models reproduce AO primary production? Is there an agreement on what physical factors control the present day AO production? What are the main improvements needed in underlying physical models?

3 Participating models Model Domain, resolution Biology NEMO
K.Popova, Y.Aksenov 0.25o Global (10-15km in AO) P2Z2D2N3Chl2 UW J.Zhang, M.Steele AO+GIN ~25km P2Z3N2D-DOM UL F.Dupont AO 1/2o PZDN + ice ecosystem LANL M.Jin, E. Hanke 1o Global P3Z3N2D + ice ecosystem OCCAM A.Yool, A. Coward PZDN-Chl

4 Factors limiting primary production
Light Time Nutrients Nutrients

5

6 Observations

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10 Conclusions: All participating models reproduce broadly similar and realistic pattern of annual primary production However physical factors controlling production are different All models reproduce a broadly similar ice extent and concentration providing a similar light regime Winter mixing and (possibly) penetration of pacific waters are substantially different in the models providing different amount of nutrients available for production. Nutrient overestimation is not detrimental for the present day primary production because of the strong light control, however it is crucial for the future projections. Models with excessive nutrients will show continuous increase of primary production with the retreating sea ice. Model with underestimated nutrients will show no response.

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