Derivation of polarization from Odin/OSIRIS limb spectra

McLinden, Chris A.

doi:10.1029/2004gl020825

Cited by 11 publications

(9 citation statements)

References 13 publications

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“…Additional primary data products are stratospheric and upper tropospheric NO 2 [4,8,9] and aerosol extinction coefficients [10]. Research data products include OH [11], OClO [12], BrO, limb polarization [13], and polar mesospheric clouds [14].…”

Section: Odin/osirismentioning

confidence: 99%

An evaluation of Odin/OSIRIS limb pointing and stratospheric ozone through comparisons with ozonesondes

McLinden¹,

Fioletov²,

Haley³

et al. 2007

Can. J. Phys.

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Five-plus years of Odin/OSIRIS (Optical Spectrograph and Infrared Imager System) ozone profiles (version 3.0 and SaskMART) have been compared with coincident ozonesonde profiles from the tropopause to the middle stratosphere (∼10-35 km). The OSIRIS(v3.0)-sonde comparisons, together with the "knee" technique, suggest that OSIRIS pointing is stable with an accuracy (systematic uncertainty) of 100 m and a precision (random uncertainty) of 400 m. Comparison of coincident profiles revealed excellent overall agreement with differences generally not exceeding 10% between 10 and 35 km. During periods of satellite eclipse larger differences above 25 km were found and concluded to be the result of flexing of the spacecraft frame brought about by cooling. Uncertainties derived from the intercomparison suggest an OSIRIS precision of 25-30% at 10 km, reaching a minimum of about 4-6% in the middle-stratosphere (23-28 km), and 6-8% at 35 km. Ozonesonde uncertainties were also derived and found to be slightly larger in the tropics than mid-latitudes, possibly due to a lack of column normalization at some of the tropical stations. OSIRIS SaskMART ozone, an alternative ozone data product, was found to be very comparable with the v3.0 ozone, with slightly smaller biases relative to the ozonesondes. OSIRIS is concluded to be a robust and accurate source of stratospheric ozone profiles. PACS Nos.: 82.33.Tb, 95.75.Qr, 42.68.−w Résumé : Nous avons comparé cinq ans de mesures sur l'ozone faites par Odin/OSIRIS (version 3.0 et SaskMART) avec des mesures coincidentes par sonde ozonique (stations terrestres) prises entre la tropopause et la stratosphère moyenne (∼10-35 km), afin d'évaluer la capacité d'OSIRIS à mesurer l'ozone et à positionner ses mesures. Les comparaisons suggèrent que la précision de visée en altitude d'OSIRIS est stable, avec une fidélité

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Section: Odin/osirismentioning

confidence: 99%

An evaluation of Odin/OSIRIS limb pointing and stratospheric ozone through comparisons with ozonesondes

McLinden¹,

Fioletov²,

Haley³

et al. 2007

Can. J. Phys.

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“…Notice that an absolute calibration of the reflectance is unimportant for the alternative polarisation retrieval, and that absolute calibration errors in µ D 2 and µ D 3 would lead to wrong Q/I and U/I , but their combination would still result in a right polarisation correction of the reflectance, and removal of the polarisation feature at 350 nm. At this point it should be mentioned that a similar method as the one presented in this paper, based on the same ideas and assumptions, has recently been published by McLinden et al (2004). Here the degree of linear polarisation is derived from limb-scattered sunlight measured by the OSIRIS instrument (flown on the Odin satellite).…”

Section: Alternative Polarisation Retrieval Algorithmmentioning

confidence: 98%

Alternative polarisation retrieval for SCIAMACHY in the ultraviolet

Tilstra

Stammes

2005

Atmos. Chem. Phys.

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Abstract.We introduce an alternative method for the retrieval of polarisation in the ultraviolet by the satellite spectrometer SCIAMACHY. Unlike the operational polarisation retrieval algorithm, this method does not use the Polarisation Measurement Devices (PMDs) onboard SCIAMACHY, but only requires the reflectance signal. This makes the algorithm more robust and less sensitive to calibration errors caused by either improper characterisation of the instrument's response functions (key data) or degradation of the optical components.The alternative polarisation retrieval is able to retrieve the full state of atmospheric polarisation in the wavelength range between 330 and 400 nm, which is essentially the wavelength region covered by SCIAMACHY's PMD 1. This allows a direct comparison with the current operational product.When we compare the alternative polarisation algorithm with the operational algorithm, we find in some cases agreement, but not in other cases. The alternative algorithm compares well with an analytical model of the polarisation of a cloud-free scene. Using the alternative algorithm the polarisation-sensitive feature in the SCIAMACHY reflectance around 350 nm is automatically corrected for.

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“…Every major trace gas absorber relevant for the considered spectral range (300-1700 nm) was included in the simulation with a fixed profile using a climatological data base similar to that described in Haley et al (2004) and McLinden et al (2010). Absorption cross sections were taken from the HITRAN 2004 data base for line absorbers (Rothman et al, 2005) (O 2 , H 2 O, CO 2 ) and from measurements by the SCIAMACHY PFM satellite spectrometer for O 3 and NO 2 (Bogumil et al, 2003).…”

Section: Scenariosmentioning

confidence: 99%

“…Aside from SCIAMACHY, limb polarization measurements are only available from a number of aircraft missions (McLinden et al, 1999). Indirect measurements in the UV region have been performed as part of O 3 retrievals from OSIRIS spectra (McLinden et al, 2004). SCIAMACHY, however, has the unique potential to provide the only contiguous and global limb polarization profile data available, now spanning almost 10 years.…”

Section: Introductionmentioning

confidence: 99%

Polarization data from SCIAMACHY limb backscatter observations compared to vector radiative transfer model simulations

et al. 2013

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Abstract. SCIAMACHY is a passive imaging spectrometer onboard ENVISAT designed to obtain trace gas abundances from measured radiances and irradiances in the UV to SWIR range in nadir-, limb- and occultation-viewing modes. Its grating spectrometer introduces a substantial sensitivity to the polarization of the incoming light with nonnegligible effects on the radiometric calibration. To be able to correct for the polarization sensitivity, SCIAMACHY utilizes broadband Polarization Measurement Devices (PMDs). While for the nadir-viewing mode the measured atmospheric polarization has been validated against POLDER data (Tilstra and Stammes, 2007, 2010), a similar validation study regarding the limb-viewing mode has not yet been performed. This paper aims at an assessment of the quality of the SCIAMACHY limb polarization data. Since limb polarization measurements by other air/spaceborne instruments in the spectral range of SCIAMACHY are not available, a comparison with radiative transfer simulations by SCIATRAN V3.1 (Rozanov et al., 2013) using a wide range of atmospheric parameters is performed. SCIATRAN is a vector radiative transfer model (VRTM) capable of performing calculations of the multiply scattered radiance in a spherically symmetric atmosphere. The study shows that the limb polarization data exhibit a large time-dependent bias that decreases with wavelength. Possible reasons for this bias are a still unknown combination of insufficient accuracy or inconsistencies of the on-ground calibration data, scan mirror degradation and stress induced changes of the polarization response of components inside the optical bench of the instrument. It is shown that it should in principle be feasible to recalibrate the effective polarization sensitivity of the instrument using the in-flight data and VRTM simulations.

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Derivation of polarization from Odin/OSIRIS limb spectra

Cited by 11 publications

References 13 publications

An evaluation of Odin/OSIRIS limb pointing and stratospheric ozone through comparisons with ozonesondes

An evaluation of Odin/OSIRIS limb pointing and stratospheric ozone through comparisons with ozonesondes

Alternative polarisation retrieval for SCIAMACHY in the ultraviolet

Polarization data from SCIAMACHY limb backscatter observations compared to vector radiative transfer model simulations

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