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Effect of Gaseous Absorption. Question: How much error will be induced if a climatology-based correction is used when real-time data is not available?

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  1. Effect of Gaseous Absorption Question: How much error will be induced if a climatology-based correction is used when real-time data is not available? Note: the inherent atmospheric correction error is about 0.001 in reflectance at 443 nm (Gordon, 1997), corresponding to about 5% error in Lw(443) for clear, blue water. This sets a limit for our goal.

  2. Ozone Climatology (1998-2007) January mean January stdev

  3. Ozone Climatology (1998-2007) July mean July stdev

  4. Error in Lt (551 nm) and Lw (551 nm) Assuming 0=45o, =45o, if a monthly climatology ozone is used instead of real-time ozone, there is a 95% chance that the error in the “corrected” Lt(551 nm) is smaller than the value below. A 1% error in Lt(551 nm) is corresponding to about 10% error in Lw(551 nm) [Lt,typical  3 mW cm-2 m-1 sr-1, while Lw,typical0.3]. Errors for the blue wavelengths are much smaller. Note that the error has both signs.

  5. Error in Lt (551 nm) and Lw (551 nm)

  6. Effect of Gaseous Absorption How about NO2?

  7. NO2 Climatology (2004-2008) Total NO2 climatology used in SeaDAS. Units: 1015 cm-2

  8. NO2 Climatology (2004-2008) Jan – Dec Mean Jan – Dec Stdev Units: 1015 cm-2

  9. Effect of Gaseous Absorption Question: How much error will be induced if a climatology-based NO2 correction is used when real-time NO2 data is not available?

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