Atmospheric polarisation measured by polder
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Atmospheric polarisation measured by POLDER. Polarisation: Stokes vectors, direction, etc. POLDER Results of analysis of POLDER polarisation data Conclusion / Relevance to SCIAMACHY. 28 August, 2003. Atmospheric light: Stokes vector {I, Q, U, V}. Polarisation.

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Atmospheric polarisation measured by POLDER

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Atmospheric polarisation measured by polder

Atmospheric polarisation measured by POLDER

  • Polarisation: Stokes vectors, direction, etc.

  • POLDER

  • Results of analysis of POLDER polarisation data

  • Conclusion / Relevance to SCIAMACHY

28 August, 2003


Polarisation

Atmospheric light: Stokes vector {I, Q, U, V}

Polarisation

V = 0 ; Q and U describe the linear part of polarisation

  • Q = I0°– I90°

  • U = I45°– I135°

  • Q = P I cos 2

  • U = P I sin 2

  • P = degree of polarisation

  • = direction of polarisation


Polder adeos i

POLDER (ADEOS-I)

  • CCD detector matrix.

  • Bandfilter carousel.

  • Resolution 6 x 7 km2.

  • Polarisation at 443,

    670 and 865 nm.

  • I, Q, and U.


Direction of polarisation

Comparison between POLDER and single scattering theory:

Direction of polarisation

 = ½ atan U/Q


Conclusions

Conclusions

  • Spread for a large part determined by measurement errors in POLDER data, especially at larger wavelengths.

  • Direction of polarisation ~ single scattering value.

  • No need to measure it (SCIAMACHY).

  • It’s BETTER not to use a measured value (SCIAMACHY).


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