Assimilating ocean colour and other marine ECVs

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Presentation transcript:

Assimilating ocean colour and other marine ECVs David Ford CCI-CMUG 6th Integration Meeting, 15th March 2016

Contents Ocean colour assimilation Ocean colour V1 and V2 compared Integrated assessment of marine ECVs

Ocean colour assimilation

Experiments Assimilate chlorophyll into FOAM-HadOCC Global reanalysis for Sept 1997 – July 2012 Compare: Control run Assimilation of OC-CCI V1 chlorophyll Assimilation of GlobColour chlorophyll Assess: Impact of assimilation on biology and carbon cycle Differences between OC-CCI and GlobColour runs Seasonal and inter-annual variability

Error vs in situ chlorophyll profiles Control OC-CCI GlobColour RMSE Bias

Air-sea CO2 flux – June (1998-2012 mean) (version appeared in Gehlen et al., 2015, J. Oper. Oceanog.) Climatology Control run 4 molC/m2/yr 2 Into ocean 0 ---------- Out of ocean -2 GlobColour assim OC-CCI assim

Planetary Visions animation

Summary Assimilation improves model results Reanalyses capture real-world variability OC-CCI and GlobColour both fit for purpose Some improved coverage and stability with OC-CCI Paper to be submitted shortly

Ocean colour V1 and V2 compared

V2 products Product user guide improved, especially regarding uncertainties Change of variable names (for the better), but otherwise easy to start using V1 metadata error corrected, no new errors found Short test run to compare with V1 (January 2011, 1/4°)

Surface chlorophyll January 31st 2011 Assimilating v1 Assimilating v2

Integrated assessment of marine ECVs

Outline of work Assess cross-consistency of marine ECVs (ocean colour, SST, sea level, sea ice conc.) Assimilation experiments with FOAM-HadOCC Assess now using current product versions OC: V2 SST: V1.1 SL: V1.1 SIC: OSI SAF Repeat (in part) at end of Phase 2 using final Phase 2 releases

Experiments Statistical assessment of observations Model runs assimilating ECVs individually and in combination 1° : 1998-2013 ¼ °: 2008-2011

Experiments Statistical assessment of observations Model runs assimilating ECVs individually and in combination 1° : 1998-2013 ¼ °: 2008-2011 Model runs currently in progress - results next time!

Things to assess Frontal positions in different fields Eddy structures in different fields Sea ice edge in different fields Seasonal progression of different fields Inter-annual variability in different fields and relationship to ENSO, NAO, MOC etc Error in assimilated and non-assimilated fields Impact of SST assimilation on OC increments Response of carbon cycle to assimilation Uncertainty of observations Anything else that might be of interest?

Questions and answers