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SLT TOURNIER Emmanuel (visitor) Eric CHASSIGNET

Evaluation of the MISST SST satellite product as a potential observational dataset for HYCOM hindcast. SLT TOURNIER Emmanuel (visitor) Eric CHASSIGNET. OUTLINE. Motivation Model: HYCOM (HYbrid Coordinate Ocean Model) Datasets: MISST (Multi-sensor Improved Sea Surface Temperature)

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SLT TOURNIER Emmanuel (visitor) Eric CHASSIGNET

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  1. Evaluation of the MISST SST satellite product as a potential observational dataset for HYCOM hindcast SLT TOURNIER Emmanuel (visitor) Eric CHASSIGNET

  2. OUTLINE • Motivation • Model: • HYCOM (HYbrid Coordinate Ocean Model) • Datasets: • MISST (Multi-sensor Improved Sea Surface Temperature) • NDBC (National Data Buoy Center) • Results • Discussion and conclusion

  3. Aim of my study : • To know if the new SST satellite product MISST could improve HYCOM, if HYCOM assimilated it. • Why? • MISST is new dataset and HYCOM assimilate older satellite data

  4. Method To compare HYCOM outputs and MISST dataset using independent data (NDBC buoys data) The study is a statistical one, leads over one year for several locations

  5. HYCOM (HYbrid Coordinate Ocean Model) • Global ocean model, 1/12° horizontal resolution • Currently, HYCOM assimilates the SST dataset from the satellite AVH-RR (Infra-red, resolution 9 km) through NCODA

  6. MISST (Multi-sensor Improved Sea Surface Temperature) • New project with 2 main objectives : • to produce an improved, high-resolution, global, NRT SST analysis using IR and MW satellites. • to demonstrate the impact of these improved SSTs on operational ocean models, numerical weather prediction, and tropical cyclone intensity forecasting.

  7. MISST data From website : “http://misst.org”

  8. NDBC (National Data Buoy Center) From website : “http://www.ndbc.noaa.gov/” - SST measured at the depth of 1m, every hour - Latitude and longitude given

  9. SST time series for year 2006 at location buoy # 42003 HYCOM MISST NDBC

  10. ANalysis Of VAriance (ANOVA) Trend : For each season, HYCOM mean better matches with NDBC mean than MISST In some cases, MISST mean is significantly different from NDBC Buoy # 42001 Buoy # 42003

  11. Linear regression for residual The residual is the SST difference between each day and the average over the week. Buoy # 42001 Relationship : HYCOM has a better slope, but not always. Buoy # 42003

  12. SST difference buoy # 42001 buoy # 42002

  13. Conclusion & discussion • No major difference between HYCOM outputs and MISST data • Seasonal mean SST from HYCOM is closer to the NDBC data • MISST data tend to have negative bias compared to the NDBC data • Comparison directly between AVH-RR and MISST could be interesting • Compare HYCOM with others MISST products when available

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