Aerosol Retrievals from Individual AVHRR Channels. Part II: Quality Control, Probability Distribution Functions, Information Content, and Consistency Checks of Retrievals
| Autor: | Alexander Ignatov, Larry L. Stowe |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | Journal of the Atmospheric Sciences. 59:335-362 |
| ISSN: | 1520-0469 0022-4928 |
| Popis: | This second part of a two-part study evaluates retrievals of aerosol optical depths, τ1 and τ2, in Advanced Very High Resolution Radiometer (AVHRR) channels 1 and 2 centered at λ1 = 0.63 and λ2 = 0.83 μm, and an effective Angstrom exponent, α, derived therefrom as α = −ln(τ1/τ2)/ln(λ1/λ2). The retrievals are made with the Second Simulation of the Satellite Signal in the Solar Spectrum (6S) radiative transfer model from four NOAA-14 AVHRR datasets, collected between February 1998 and May 1999 in the latitudinal belt of 5°–25°S. A series of quality control (QC) checks applied to the retrievals to identify outliers are described. These remove a total of ∼1% of points, which presumably originate from channel misregistration, residual cloud in AVHRR cloud-screened pixels, and substantial deviations from the assumptions used in the retrieval model (e.g., bright coastal and high altitude inland waters). First, from examining histograms of the derived parameters it is found that τ and α are accurately fi... |
| Databáze: | OpenAIRE |
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