SLT TOURNIER Emmanuel (visitor) Eric CHASSIGNET
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Transcript of SLT TOURNIER Emmanuel (visitor) Eric CHASSIGNET
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Evaluation of the MISST SST satellite product as a potential
observational dataset for HYCOM hindcast
SLT TOURNIER Emmanuel (visitor)
Eric CHASSIGNET
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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
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• 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
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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
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HYCOM
• 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
(HYbrid Coordinate Ocean Model)
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MISST
• 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.
(Multi-sensor Improved Sea Surface Temperature)
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MISST data
From website : “http://misst.org”
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NDBC
- SST measured at the depth of 1m, every hour
- Latitude and longitude given
(National Data Buoy Center)
From website : “http://www.ndbc.noaa.gov/”
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SST time series for year 2006 at location buoy # 42003
HYCOM
MISST
NDBC
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ANalysis Of VAriance (ANOVA)
Buoy # 42001 Buoy # 42003
Trend :
For each season, HYCOM mean better matches with NDBC mean than MISST
In some cases, MISST mean is significantly different from NDBC
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Linear regression for residual
The residual is the SST difference between each day and the average over the week.
Relationship :
HYCOM has a better slope, but not always.
Buoy # 42001
Buoy # 42003
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SST difference
buoy # 42002
buoy # 42001
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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