optical depth

Symbol: τ. A measure of the absorption of radiation of a particular wavelength as it passes through a gaseous medium. If the initial radiation flux Φ₀ is reduced to Φ_x after a distance x through the medium then Φ_x /Φ₀ = exp(–τ) where τ is the optical depth for the radiation wavelength. If τ equals zero the medium is transparent; if τ is much greater or much less than one the medium is optically thick or optically thin respectively. See also opacity.

optical depth

[′äp·tə·kəl ′depth] (meteorology) optical thickness

单词	optical depth
释义	optical depth optical depth Symbol: τ. A measure of the absorption of radiation of a particular wavelength as it passes through a gaseous medium. If the initial radiation flux Φ₀ is reduced to Φ_x after a distance x through the medium then Φ_x /Φ₀ = exp(–τ) where τ is the optical depth for the radiation wavelength. If τ equals zero the medium is transparent; if τ is much greater or much less than one the medium is optically thick or optically thin respectively. See also opacity. optical depth [′äp·tə·kəl ′depth] (meteorology) optical thickness
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