J meijer j f de haan p f levelt knmi de bilt the netherlands
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The Effect of Rotational Raman Scattering on Ozone Profile Retrieval PowerPoint PPT Presentation


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J. Meijer, J.F. de Haan, P.F. Levelt KNMI, De Bilt, The Netherlands. The Effect of Rotational Raman Scattering on Ozone Profile Retrieval. Contents. Introduction Rotational Raman Scattering RRS Approximation Algorithm Results Conclusions. Introduction.

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The Effect of Rotational Raman Scattering on Ozone Profile Retrieval

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J. Meijer, J.F. de Haan, P.F. Levelt

KNMI, De Bilt, The Netherlands

The Effect ofRotational Raman ScatteringonOzone Profile Retrieval


Contents

  • Introduction

  • Rotational Raman Scattering

  • RRS Approximation Algorithm

  • Results

  • Conclusions


Introduction

error in total DOAS ozone column if rotational Raman scattering is not taken into account

up to 10 %


Introduction

error in ozone profile if rotational Raman scattering is not taken into account

up to 60 %


Introduction - Profile Retrieval

Different wavelengths give information on different heights


Rotational Raman Scattering

N2

inelastic scattering of photons on air molecules

3.8% of photons are scattered both to longer and shorter wavelengths

width of feature about 4 nm in UV


Rotational Raman Scattering


Rotational Raman Scattering


Rotational Raman Scattering


Rotational Raman Scattering

connection between wavelengths →radiative transfer code very complicated

not feasible for operational ozone profile algorithm

OMI takes 15 spectra/second →time available 0.2 – 1.0 s per computer/node

we have to use an approximation


OMI Raman Approximation

ozone layer

Rotational Raman Scattering (4%)


OMI Raman Approximation

Incident

Sunlight

Ozone Absorption

Single Rayleigh Scattering

Cabannes

not scrambled

96.2 %

Raman

scrambled

3.8 %

Ozone

Absorption

Ozone

Absorption

Received by sensor


Results


Results


Results


Conclusions

  • Dramatic improvement in ozone profile retrieval by including rotational Raman scattering, especially for the troposphere and lower stratosphere

  • Approximation is efficient and has been implemented in the operational OMI KNMI ozone profile retrieval algorithm


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