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Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory
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| Zeitschriftentitel: | Geophysical Research Letters |
|---|---|
| Personen und Körperschaften: | , |
| In: | Geophysical Research Letters, 31, 2004, 1 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| author_facet |
Horváth, Ákos Davies, Roger Horváth, Ákos Davies, Roger |
|---|---|
| author |
Horváth, Ákos Davies, Roger |
| spellingShingle |
Horváth, Ákos Davies, Roger Geophysical Research Letters Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory General Earth and Planetary Sciences Geophysics |
| author_sort |
horváth, ákos |
| spelling |
Horváth, Ákos Davies, Roger 0094-8276 1944-8007 American Geophysical Union (AGU) General Earth and Planetary Sciences Geophysics http://dx.doi.org/10.1029/2003gl018386 <jats:p>Bi‐directional reflectances of marine liquid water clouds, as measured by the Multiangle Imaging SpectroRadiometer (MISR), are compared with plane‐parallel radiative transfer model calculations. We define an angular consistency test that requires measured and modeled radiances to agree within ±5% for all chosen view angles for the observations to be classified as plane‐parallel. When all nine MISR angles are used at the full 275 m resolution, 1 in 6 pixels (17%) pass the test. There is a slight dependence on effective radius <jats:italic>R</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub>, with <jats:italic>R</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub> = 8 μm resulting in the highest pass rate. As the resolution is degraded, clouds appear more plane‐parallel, and the passing rate increases to 38% at the coarsest 17.6 km scale. The passing rate quickly decreases as the number of angles used in the angular test increases. Requiring a match at only the nadir and two near‐nadir angles immediately eliminates half of the full resolution pixels.</jats:p> Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory Geophysical Research Letters |
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| title |
Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_unstemmed |
Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_full |
Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_fullStr |
Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_full_unstemmed |
Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_short |
Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_sort |
anisotropy of water cloud reflectance: a comparison of measurements and 1d theory |
| topic |
General Earth and Planetary Sciences Geophysics |
| url |
http://dx.doi.org/10.1029/2003gl018386 |
| publishDate |
2004 |
| physical |
|
| description |
<jats:p>Bi‐directional reflectances of marine liquid water clouds, as measured by the Multiangle Imaging SpectroRadiometer (MISR), are compared with plane‐parallel radiative transfer model calculations. We define an angular consistency test that requires measured and modeled radiances to agree within ±5% for all chosen view angles for the observations to be classified as plane‐parallel. When all nine MISR angles are used at the full 275 m resolution, 1 in 6 pixels (17%) pass the test. There is a slight dependence on effective radius <jats:italic>R</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub>, with <jats:italic>R</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub> = 8 μm resulting in the highest pass rate. As the resolution is degraded, clouds appear more plane‐parallel, and the passing rate increases to 38% at the coarsest 17.6 km scale. The passing rate quickly decreases as the number of angles used in the angular test increases. Requiring a match at only the nadir and two near‐nadir angles immediately eliminates half of the full resolution pixels.</jats:p> |
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| author | Horváth, Ákos, Davies, Roger |
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| description | <jats:p>Bi‐directional reflectances of marine liquid water clouds, as measured by the Multiangle Imaging SpectroRadiometer (MISR), are compared with plane‐parallel radiative transfer model calculations. We define an angular consistency test that requires measured and modeled radiances to agree within ±5% for all chosen view angles for the observations to be classified as plane‐parallel. When all nine MISR angles are used at the full 275 m resolution, 1 in 6 pixels (17%) pass the test. There is a slight dependence on effective radius <jats:italic>R</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub>, with <jats:italic>R</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub> = 8 μm resulting in the highest pass rate. As the resolution is degraded, clouds appear more plane‐parallel, and the passing rate increases to 38% at the coarsest 17.6 km scale. The passing rate quickly decreases as the number of angles used in the angular test increases. Requiring a match at only the nadir and two near‐nadir angles immediately eliminates half of the full resolution pixels.</jats:p> |
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| spelling | Horváth, Ákos Davies, Roger 0094-8276 1944-8007 American Geophysical Union (AGU) General Earth and Planetary Sciences Geophysics http://dx.doi.org/10.1029/2003gl018386 <jats:p>Bi‐directional reflectances of marine liquid water clouds, as measured by the Multiangle Imaging SpectroRadiometer (MISR), are compared with plane‐parallel radiative transfer model calculations. We define an angular consistency test that requires measured and modeled radiances to agree within ±5% for all chosen view angles for the observations to be classified as plane‐parallel. When all nine MISR angles are used at the full 275 m resolution, 1 in 6 pixels (17%) pass the test. There is a slight dependence on effective radius <jats:italic>R</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub>, with <jats:italic>R</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub> = 8 μm resulting in the highest pass rate. As the resolution is degraded, clouds appear more plane‐parallel, and the passing rate increases to 38% at the coarsest 17.6 km scale. The passing rate quickly decreases as the number of angles used in the angular test increases. Requiring a match at only the nadir and two near‐nadir angles immediately eliminates half of the full resolution pixels.</jats:p> Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory Geophysical Research Letters |
| spellingShingle | Horváth, Ákos, Davies, Roger, Geophysical Research Letters, Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory, General Earth and Planetary Sciences, Geophysics |
| title | Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_full | Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_fullStr | Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_full_unstemmed | Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_short | Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| title_sort | anisotropy of water cloud reflectance: a comparison of measurements and 1d theory |
| title_unstemmed | Anisotropy of water cloud reflectance: A comparison of measurements and 1D theory |
| topic | General Earth and Planetary Sciences, Geophysics |
| url | http://dx.doi.org/10.1029/2003gl018386 |