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CDOM Absorption: ac9 Emmanuel Boss

CDOM Absorption: ac9 Emmanuel Boss. ac9. 10/25 cm. Sensitivity better than spectrophotometers. Why?. Reference (blank) material?. Why do we need a blank ?. Twardowski et al, 1997 (similar for c):. How do we blank?. Important points: Clean water w/o bubbles.

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CDOM Absorption: ac9 Emmanuel Boss

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  1. CDOM Absorption: ac9Emmanuel Boss

  2. ac9 10/25 cm Sensitivity better than spectrophotometers. Why? Reference (blank) material? Why do we need a blank ?

  3. Twardowski et al, 1997 (similar for c):

  4. How do we blank? • Important points: • Clean water w/o bubbles. • Calibrate sensors the same way they are deployed. • Take temperature reading (see soon).

  5. (1997) What should we use for reference temperature?

  6. How good is the assumption of a linear drift? • Suggested protocol: • Measure a and c of blank water. • Correct blank for temperature effects (relative to factory). • Measure a and c of CDOM • Correct for blank. • Correct for effect of temperature and salinity (relative to factory). How do we expect the a and c spectra of CDOM to look after all the corrections?

  7. Provides great check on calibration !

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