Method for correction of errors in observation angles for limb thermal emission measurements

Abbas, M. M.; Shapiro, Gary L.; Conrath, B. J.; Kunde, V. G.; Maguire, W. C.

doi:10.1364/ao.23.001862

Cited by 12 publications

(6 citation statements)

References 5 publications

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“…However, if the temperature profile is known, the angles may be retrieved from the observed spectra of a gas of known concentration. In the far-infrared spectral region the magnetic dipole lines of 02 may be analyzed to retrieve the observation angles by following an inversion technique similar to that employed for retrieval of constituent distributions [Abbas et al, 1984b]. In this procedure, possible systematic errors in the temperature versus pressure profile and the balloon-float height are included in the uncertainties in the retrieved angles.…”

Section: Retrieval Of Observation Anglesmentioning

confidence: 94%

Stratospheric O₃, H₂O, and HDO distributions from balloon‐based far‐infrared observations

Abbas

Guo

Carli³

et al. 1987

J. Geophys. Res.

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Limb thermal emission spectra of the earth's stratosphere in the far‐infrared spectral region, obtained as part of the Balloon Intercomparison Campaign (BIC), have been analyzed for retrieval of trace constituent distributions. The observations analyzed here were made with a balloon‐borne high‐resolution Michelson interferometer operating in the 20–100 cm−1 region, with an unapodized spectral resolution of 0.0033 cm−1. In this paper the vertical profiles of O3, H2O, and HDO retrieved from the observed spectra are presented and compared with the results from other BIC experiments. The retrieved profiles are found to be in good agreement with other measurements. The measurement of the HDO profile provides information about the sources of stratospheric water vapor. The variation of the D/H ratio of water vapor is derived from an analysis of HDO and H2O lines observed in the far‐infrared spectra and is compared with the available measurements in the literature.

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Section: Retrieval Of Observation Anglesmentioning

confidence: 94%

Stratospheric O₃, H₂O, and HDO distributions from balloon‐based far‐infrared observations

Abbas

Guo

Carli³

et al. 1987

J. Geophys. Res.

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“…This implies that, in order to avoid error propagation caused by unknown species abundances, only transitions of species should be used whose abundances change only slightly and are well known. Traditionally, both in absorption and emission spectroscopy, small spectral regions (so‐called “microwindows”) which contain only CO 2 lines are used for this purpose [see, e.g., Abbas et al , 1984; Rinsland et al , 1992; Stiller et al , 1995]. Errors caused by variations of CO 2 mixing ratios are discussed in sections 3 and 4.…”

Section: Retrieval Processormentioning

confidence: 99%

“…A wealth of literature exists on how to infer temperature and/or pressure from space‐borne limb emission measurements [see, e.g., Gille and House , 1971; Abbas et al , 1984; Kumer and Mergenthaler , 1991; Mertens et al , 2001]. The retrieval algorithm used by the European Space Agency (ESA) for so‐called operational near‐real time data processing with the requirement to deliver pressure, temperature, and volume mixing ratio profiles of H 2 O, O 3 , HNO 3 , CH 4 , N 2 O, and NO 2 within 3 hours after measurement has been documented by Ridolfi et al [2000].…”

Section: Introductionmentioning

confidence: 99%

Retrieval of temperature and tangent altitude pointing from limb emission spectra recorded from space by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS)

et al. 2003

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[1] Retrieval of abundances of atmospheric species from limb infrared emission spectra requires accurate knowledge of the pointing of the instrument in terms of elevation, as well as temperature and pressure profiles. An optimal estimation-based method is presented to infer these quantities from measured spectra. The successful and efficient joint retrieval of these largely correlated quantities depends strongly on the proper selection of the retrieval space, the selection of spectral microwindows, and the choice of reasonable constraints which force the solution to be stable. The proposed strategy was applied to limb emission spectra recorded with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on board the Envisat research satellite in order to validate the instrument pointing information based on the satellite's orbit and attitude control system which uses star tracker information as a reference. Both systematic and periodic pointing calibration errors were detected, which meanwhile have been corrected to a major part. Furthermore, occasional pitch jumps were detected, which could be assigned to parameter uploads to the satellite's orbit and attitude control system. It has been shown that in general, it is justified to assume local thermodynamic equilibrium below 60 km for these purposes. The retrieval method presented has been proven to be suitable for independent monitoring of MIPAS line-of-sight pointing.

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“…An infinitesimal field of view is assumed despite its finite value of about 1.6 ø . The error introduced by this assumption [Abbas et al, 1984[Abbas et al, , 1985 can be disregarded within the limits of this work. assessment of the spectroscopic components of the atmospheric spectrum.…”

Section: Local Thermodynamic Equilibrium Is Assumed Every-mentioning

confidence: 99%

Atlas of stratospheric submillimeter lines: 2. The 20‐ to 40‐cm⁻¹ interval

Baldecchi¹,

Carli²,

Mencaraglia³

et al. 1988

J. Geophys. Res.

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In this paper we give the second part, covering the interval 20–40 cm−1, of the atlas of submillimeter lines observed in the atmospheric emission spectrum from 38.2‐km altitude with a resolution of 0.0033 cm−1. This resolution appears to be adequate for detailed interpretation of the spectrum in terms of rotational transitions of most trace molecules relevant to the photochemistry of the atmosphere. A table of assignments of the observed features to expected molecular transitions is given, together with a comparison of the measured spectrum with a synthetic spectrum obtained from radiative transfer calculation.

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Method for correction of errors in observation angles for limb thermal emission measurements

Cited by 12 publications

References 5 publications

Stratospheric O₃, H₂O, and HDO distributions from balloon‐based far‐infrared observations

Stratospheric O₃, H₂O, and HDO distributions from balloon‐based far‐infrared observations

Retrieval of temperature and tangent altitude pointing from limb emission spectra recorded from space by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS)

Atlas of stratospheric submillimeter lines: 2. The 20‐ to 40‐cm⁻¹ interval

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Method for correction of errors in observation angles for limb thermal emission measurements

Cited by 12 publications

References 5 publications

Stratospheric O3, H2O, and HDO distributions from balloon‐based far‐infrared observations

Stratospheric O3, H2O, and HDO distributions from balloon‐based far‐infrared observations

Retrieval of temperature and tangent altitude pointing from limb emission spectra recorded from space by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS)

Atlas of stratospheric submillimeter lines: 2. The 20‐ to 40‐cm−1 interval

Contact Info

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Stratospheric O₃, H₂O, and HDO distributions from balloon‐based far‐infrared observations

Stratospheric O₃, H₂O, and HDO distributions from balloon‐based far‐infrared observations

Atlas of stratospheric submillimeter lines: 2. The 20‐ to 40‐cm⁻¹ interval