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A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS
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| Zeitschriftentitel: | Journal of Geophysical Research: Atmospheres |
|---|---|
| Personen und Körperschaften: | , |
| In: | Journal of Geophysical Research: Atmospheres, 118, 2013, 5, S. 2389-2403 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| author_facet |
Liang, Lusheng Girolamo, Larry Di Liang, Lusheng Girolamo, Larry Di |
|---|---|
| author |
Liang, Lusheng Girolamo, Larry Di |
| spellingShingle |
Liang, Lusheng Girolamo, Larry Di Journal of Geophysical Research: Atmospheres A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics |
| author_sort |
liang, lusheng |
| spelling |
Liang, Lusheng Girolamo, Larry Di 2169-897X 2169-8996 American Geophysical Union (AGU) Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics http://dx.doi.org/10.1029/2012jd018201 <jats:title>Abstract</jats:title><jats:p>We examine the viewing zenith angle dependent bias (VZA bias) in warm cloud optical thickness (<jats:italic>τ</jats:italic>) retrieved from a plane‐parallel approach applied to fused Moderate Resolution Imaging Spectroradiometer (MODIS) and Multi‐angle Imaging SpectroRadiometer (MISR) data for the months of January and July between 2001 and 2008. The near‐simultaneous multiple view‐angle observations from MISR offers many advantages over previous <jats:italic>τ</jats:italic>‐VZA bias studies: 1) The analysis no longer requires seasonal and latitudinal cloud invariant assumptions, 2) consistent cloudy scene identification with VZA, 3) stratification of VZA‐bias with scene characteristics, and 4) a greater range of sun‐view geometries. Contrasting results between previous studies are resolved through careful consideration of the relative azimuth angle (RAZ) between sun and view. Relative to nadir‐retrieved <jats:italic>τ</jats:italic>, <jats:italic>τ</jats:italic> increases in both forward‐ and backscatter directions with higher value in backscatter directions for solar zenith angle (SZA) < ~40°. For SZA > ~40°, <jats:italic>τ</jats:italic> increases with increasing VZA in backscatter directions and strongly decreases in forward‐scatter directions. For the most oblique views, ~40–100% absolute monthly mean differences relative to nadir‐retrieved <jats:italic>τ</jats:italic> is common. This behavior is strongly tied to the sampled RAZ and explained based on three factors tied to the spatial heterogeneity of clouds. These factors also explain the behavior of the <jats:italic>τ</jats:italic>‐VZA bias when stratified by nadir‐retrieved <jats:italic>τ</jats:italic> and spatial heterogeneity, even in the thin‐cloud limit where sun‐glint effects are evident. We also observe an underestimation of <jats:italic>τ</jats:italic> relative to nadir in the rainbow‐scattering directions and attribute it to an overestimation of the cloud‐drop effective radius retrieved from MODIS due to cloud heterogeneity. There remains a need to quantify the bias in nadir‐retrieved <jats:italic>τ</jats:italic> as a function of SZA and spatial heterogeneity as a step toward providing bias correction over a wide range of sun‐view geometries.</jats:p> A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS Journal of Geophysical Research: Atmospheres |
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| title |
A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_unstemmed |
A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_full |
A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_fullStr |
A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_full_unstemmed |
A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_short |
A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_sort |
a global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from misr and modis |
| topic |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics |
| url |
http://dx.doi.org/10.1029/2012jd018201 |
| publishDate |
2013 |
| physical |
2389-2403 |
| description |
<jats:title>Abstract</jats:title><jats:p>We examine the viewing zenith angle dependent bias (VZA bias) in warm cloud optical thickness (<jats:italic>τ</jats:italic>) retrieved from a plane‐parallel approach applied to fused Moderate Resolution Imaging Spectroradiometer (MODIS) and Multi‐angle Imaging SpectroRadiometer (MISR) data for the months of January and July between 2001 and 2008. The near‐simultaneous multiple view‐angle observations from MISR offers many advantages over previous <jats:italic>τ</jats:italic>‐VZA bias studies: 1) The analysis no longer requires seasonal and latitudinal cloud invariant assumptions, 2) consistent cloudy scene identification with VZA, 3) stratification of VZA‐bias with scene characteristics, and 4) a greater range of sun‐view geometries. Contrasting results between previous studies are resolved through careful consideration of the relative azimuth angle (RAZ) between sun and view. Relative to nadir‐retrieved <jats:italic>τ</jats:italic>, <jats:italic>τ</jats:italic> increases in both forward‐ and backscatter directions with higher value in backscatter directions for solar zenith angle (SZA) < ~40°. For SZA > ~40°, <jats:italic>τ</jats:italic> increases with increasing VZA in backscatter directions and strongly decreases in forward‐scatter directions. For the most oblique views, ~40–100% absolute monthly mean differences relative to nadir‐retrieved <jats:italic>τ</jats:italic> is common. This behavior is strongly tied to the sampled RAZ and explained based on three factors tied to the spatial heterogeneity of clouds. These factors also explain the behavior of the <jats:italic>τ</jats:italic>‐VZA bias when stratified by nadir‐retrieved <jats:italic>τ</jats:italic> and spatial heterogeneity, even in the thin‐cloud limit where sun‐glint effects are evident. We also observe an underestimation of <jats:italic>τ</jats:italic> relative to nadir in the rainbow‐scattering directions and attribute it to an overestimation of the cloud‐drop effective radius retrieved from MODIS due to cloud heterogeneity. There remains a need to quantify the bias in nadir‐retrieved <jats:italic>τ</jats:italic> as a function of SZA and spatial heterogeneity as a step toward providing bias correction over a wide range of sun‐view geometries.</jats:p> |
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| description | <jats:title>Abstract</jats:title><jats:p>We examine the viewing zenith angle dependent bias (VZA bias) in warm cloud optical thickness (<jats:italic>τ</jats:italic>) retrieved from a plane‐parallel approach applied to fused Moderate Resolution Imaging Spectroradiometer (MODIS) and Multi‐angle Imaging SpectroRadiometer (MISR) data for the months of January and July between 2001 and 2008. The near‐simultaneous multiple view‐angle observations from MISR offers many advantages over previous <jats:italic>τ</jats:italic>‐VZA bias studies: 1) The analysis no longer requires seasonal and latitudinal cloud invariant assumptions, 2) consistent cloudy scene identification with VZA, 3) stratification of VZA‐bias with scene characteristics, and 4) a greater range of sun‐view geometries. Contrasting results between previous studies are resolved through careful consideration of the relative azimuth angle (RAZ) between sun and view. Relative to nadir‐retrieved <jats:italic>τ</jats:italic>, <jats:italic>τ</jats:italic> increases in both forward‐ and backscatter directions with higher value in backscatter directions for solar zenith angle (SZA) < ~40°. For SZA > ~40°, <jats:italic>τ</jats:italic> increases with increasing VZA in backscatter directions and strongly decreases in forward‐scatter directions. For the most oblique views, ~40–100% absolute monthly mean differences relative to nadir‐retrieved <jats:italic>τ</jats:italic> is common. This behavior is strongly tied to the sampled RAZ and explained based on three factors tied to the spatial heterogeneity of clouds. These factors also explain the behavior of the <jats:italic>τ</jats:italic>‐VZA bias when stratified by nadir‐retrieved <jats:italic>τ</jats:italic> and spatial heterogeneity, even in the thin‐cloud limit where sun‐glint effects are evident. We also observe an underestimation of <jats:italic>τ</jats:italic> relative to nadir in the rainbow‐scattering directions and attribute it to an overestimation of the cloud‐drop effective radius retrieved from MODIS due to cloud heterogeneity. There remains a need to quantify the bias in nadir‐retrieved <jats:italic>τ</jats:italic> as a function of SZA and spatial heterogeneity as a step toward providing bias correction over a wide range of sun‐view geometries.</jats:p> |
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| spelling | Liang, Lusheng Girolamo, Larry Di 2169-897X 2169-8996 American Geophysical Union (AGU) Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics http://dx.doi.org/10.1029/2012jd018201 <jats:title>Abstract</jats:title><jats:p>We examine the viewing zenith angle dependent bias (VZA bias) in warm cloud optical thickness (<jats:italic>τ</jats:italic>) retrieved from a plane‐parallel approach applied to fused Moderate Resolution Imaging Spectroradiometer (MODIS) and Multi‐angle Imaging SpectroRadiometer (MISR) data for the months of January and July between 2001 and 2008. The near‐simultaneous multiple view‐angle observations from MISR offers many advantages over previous <jats:italic>τ</jats:italic>‐VZA bias studies: 1) The analysis no longer requires seasonal and latitudinal cloud invariant assumptions, 2) consistent cloudy scene identification with VZA, 3) stratification of VZA‐bias with scene characteristics, and 4) a greater range of sun‐view geometries. Contrasting results between previous studies are resolved through careful consideration of the relative azimuth angle (RAZ) between sun and view. Relative to nadir‐retrieved <jats:italic>τ</jats:italic>, <jats:italic>τ</jats:italic> increases in both forward‐ and backscatter directions with higher value in backscatter directions for solar zenith angle (SZA) < ~40°. For SZA > ~40°, <jats:italic>τ</jats:italic> increases with increasing VZA in backscatter directions and strongly decreases in forward‐scatter directions. For the most oblique views, ~40–100% absolute monthly mean differences relative to nadir‐retrieved <jats:italic>τ</jats:italic> is common. This behavior is strongly tied to the sampled RAZ and explained based on three factors tied to the spatial heterogeneity of clouds. These factors also explain the behavior of the <jats:italic>τ</jats:italic>‐VZA bias when stratified by nadir‐retrieved <jats:italic>τ</jats:italic> and spatial heterogeneity, even in the thin‐cloud limit where sun‐glint effects are evident. We also observe an underestimation of <jats:italic>τ</jats:italic> relative to nadir in the rainbow‐scattering directions and attribute it to an overestimation of the cloud‐drop effective radius retrieved from MODIS due to cloud heterogeneity. There remains a need to quantify the bias in nadir‐retrieved <jats:italic>τ</jats:italic> as a function of SZA and spatial heterogeneity as a step toward providing bias correction over a wide range of sun‐view geometries.</jats:p> A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS Journal of Geophysical Research: Atmospheres |
| spellingShingle | Liang, Lusheng, Girolamo, Larry Di, Journal of Geophysical Research: Atmospheres, A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geophysics |
| title | A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_full | A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_fullStr | A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_full_unstemmed | A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_short | A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| title_sort | a global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from misr and modis |
| title_unstemmed | A global analysis on the view‐angle dependence of plane‐parallel oceanic liquid water cloud optical thickness using data synergy from MISR and MODIS |
| topic | Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geophysics |
| url | http://dx.doi.org/10.1029/2012jd018201 |