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Operational Oceanography
SST Measurements Comparison OC 3570 Operational Oceanography Winter 2006 LT Cherrett
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OUTLINE Significance of accurate SST data Comparisons of all SST measurements Radiometers Thermistors 4. Conclusions/Questions
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Significance Assimilation into models Air-Sea interaction Moisture Flux Sensible Heat Flux Bulk measurements to determine EM/EO refractive properties Aircraft based collection Near simultaneous measurements over large region Remote sensing validation
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Evaporation Duct Height Model
Wind Speed = 5 m/s
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Evaporation Duct Height Model
Wind Speed = 10 m/s
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SST measurements taken aboard RV Pt Sur
Bucket – measured by hand Intake into Seachest Intake into TSAL Boom Probe (platinum probe) Radiometer – mast (Apogee IR probe) - 3:1 spot / micron 6. Radiometer – bridgedeck (OS43L) - 30:1 spot / micron 7. Expensive Radiometer 8. Cheap Radiometer LW PIR – micron
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Comparisons
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Comparisons
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Radiometers Corrected using regression fit Cheapo-Bucket N =146 points Mean = deg STD = deg Variance = deg2 Expensive-Bucket N =140 points Mean = deg STD = deg Variance = deg2 Corrected for sky temp
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Radiometers Corrected further using temperatures between -10 and 10 deg C using PIR Corrected using expensive handheld sky temperatures
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Radiometers Rad (bridge) – Exp Rad N =139 points Mean = deg STD = deg Variance = deg2 Rad (top) – Exp Rad N =146 points Mean = deg STD = deg Variance = deg2 Rad (top) – bucket N =151 points Mean = deg STD = deg Variance = deg2 Rad (bridge) – bucket N =143 points Mean = deg STD = deg Variance = deg2
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Radiometers Rad (top) –Bucket (Sun is up) N =54 points Mean = deg STD = deg Variance = deg2 Rad (bridge) –Bucket (Sun is up) N =54 points Mean = deg STD = deg Variance = deg2 Rad (top) –Bucket (Sun is down) N =89 points Mean = deg STD = deg Variance = deg2 Rad (bridge) –Bucket (Sun is down) N =89 points Mean = deg STD = deg Variance = deg2 Significant using two sample T-dist
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Intakes vs Bucket TSAL-Bucket N =158 points Mean = deg STD = deg Variance = deg2 TSAL-Intake N =171 points Mean = 0.2 deg STD = 0.02 deg Variance = deg2 Intake (Seachest)-Bucket N =158 points Mean = deg STD = deg Variance = deg2
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Seachest vs Bucket Seachest-Bucket (Sun is up) N =66 points Mean = deg STD = deg Variance = deg2 Seachest-Bucket (Sun is down) N =92 points Mean = deg STD = deg Variance = deg2
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Boom Probe vs Bucket Boom Probe - Bucket N =9 points Mean = deg STD = deg Variance = deg2
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Thermistors
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Errors and variance: Bucket – measured by hand HUMANS! Thermometer Time of day Ship movement/mixing Intake into Seachest Subsurface collection Ships sensitive heat flux 3. Intake into TSAL 4. Boom Probe (platinum probe) Fell into a rabbit hole early Too little data to draw conclusions 5. Radiometer – Top (Apogee IR probe) Slant distance Spot size (3:1) Roll/Pitch of ship Sky temp (measured in other direction Wake (mixing of top 50 microns) 6. Radiometer – bridgedeck (OS43L) Same as Apogee 7. Expensive Handheld Radiometer Angle held Eyeball quickly changing values Wake 8. Cheap Handheld Radiometer Same as above,… You get what you pay for Bottom line: Not an absolute process of data collection.
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Questions???
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