Cindy Nevison


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Cindy Nevison


Export Production from Ocean Color

  • Export Production from Ocean Color

  • 2) Atmospheric O2/N2 Data

  • 3) Decomposition of O2/N2 seasonal cycle into Component Signals (land, thermal, ventilation, production)

  • 4) Atmospheric Transport Model Uncertainty – APO Transcom Experiment













O2/N2 APO

  • O2/N2 APO

































9 atmospheric transport models forced with Garcia and Keeling [2001] monthly oceanic O2 and N2 flux anomalies. Below: APO seasonal cycles at Cape Grim, Tasmania

  • 9 atmospheric transport models forced with Garcia and Keeling [2001] monthly oceanic O2 and N2 flux anomalies. Below: APO seasonal cycles at Cape Grim, Tasmania



Summer Winter

  • Summer Winter



Summer Winter

  • Summer Winter



1) Satellite ocean color data: uncertainties compounded in the sequence from Chl-a to NPP to Export Production.

  • 1) Satellite ocean color data: uncertainties compounded in the sequence from Chl-a to NPP to Export Production.

  • 2) Partitioning of net biological APO signal into surface production and deep ventilation: Atmospheric N2O-based method, MIT ocean model and satellite ocean color data converge on similar answer.

  • 3) Can now compare surface production signal in APO directly to export production from ocean color, but some major uncertainties:

  • 1) Need for atmospheric transport model as intermediary

  • 2) N2O cycle decomposition – thermal and stratospheric signals











O2/N2 APO

  • O2/N2 APO




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