A single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere
We present a single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere. It is based on the assumption that the upwelling internal radiation field is dominated by a surface with a uniform brightness temperature. It allows the calculation of the scatter...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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2011
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| _version_ | 1797099047941570560 |
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| author | Kleinboehl, A Schofield, J Abdou, W Irwin, P de Kok, R |
| author_facet | Kleinboehl, A Schofield, J Abdou, W Irwin, P de Kok, R |
| author_sort | Kleinboehl, A |
| collection | OXFORD |
| description | We present a single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere. It is based on the assumption that the upwelling internal radiation field is dominated by a surface with a uniform brightness temperature. It allows the calculation of the scattering source function for individual aerosol types, mixtures of aerosol types, and mixtures of gas and aerosol. The approximation can be applied in a Curtis-Godson radiative transfer code and is used for operational retrievals from Mars Climate Sounder measurements. Radiance comparisons with a multiple scattering model show good agreement in the mid- and far-infrared although the approximate model tends to underestimate the radiances in realistic conditions of the Martian atmosphere. Relative radiance differences are found to be about 2% in the lowermost atmosphere, increasing to ~10% in the middle atmosphere of Mars. The increasing differences with altitude are mostly due to the increasing contribution to limb radiance of scattering relative to emission at the colder, higher atmospheric levels. This effect becomes smaller toward longer wavelengths at typical Martian temperatures. The relative radiance differences are expected to produce systematic errors of similar magnitude in retrieved opacity profiles. © 2011 Elsevier Ltd. |
| first_indexed | 2024-03-07T05:18:03Z |
| format | Journal article |
| id | oxford-uuid:ddeadd34-f232-416f-ad38-57998b496d03 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:18:03Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:ddeadd34-f232-416f-ad38-57998b496d032022-03-27T09:28:23ZA single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphereJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ddeadd34-f232-416f-ad38-57998b496d03EnglishSymplectic Elements at Oxford2011Kleinboehl, ASchofield, JAbdou, WIrwin, Pde Kok, RWe present a single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere. It is based on the assumption that the upwelling internal radiation field is dominated by a surface with a uniform brightness temperature. It allows the calculation of the scattering source function for individual aerosol types, mixtures of aerosol types, and mixtures of gas and aerosol. The approximation can be applied in a Curtis-Godson radiative transfer code and is used for operational retrievals from Mars Climate Sounder measurements. Radiance comparisons with a multiple scattering model show good agreement in the mid- and far-infrared although the approximate model tends to underestimate the radiances in realistic conditions of the Martian atmosphere. Relative radiance differences are found to be about 2% in the lowermost atmosphere, increasing to ~10% in the middle atmosphere of Mars. The increasing differences with altitude are mostly due to the increasing contribution to limb radiance of scattering relative to emission at the colder, higher atmospheric levels. This effect becomes smaller toward longer wavelengths at typical Martian temperatures. The relative radiance differences are expected to produce systematic errors of similar magnitude in retrieved opacity profiles. © 2011 Elsevier Ltd. |
| spellingShingle | Kleinboehl, A Schofield, J Abdou, W Irwin, P de Kok, R A single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere |
| title | A single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere |
| title_full | A single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere |
| title_fullStr | A single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere |
| title_full_unstemmed | A single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere |
| title_short | A single-scattering approximation for infrared radiative transfer in limb geometry in the Martian atmosphere |
| title_sort | single scattering approximation for infrared radiative transfer in limb geometry in the martian atmosphere |
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