8 November 1996 Remote sensing applications of continuous spectral backscatter ultraviolet measurements
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Abstract
We discuss several new uses of backscatter ultraviolet (UV) measurements in atmospheric remote sensing. Radiances in the UV from 310 - 340 nm are primarily sensitive to total ozone and the effects of clouds and the Earth's surface. We have modeled UV radiances in this spectral range to an accuracy of approximately 0.5% with an efficient radiative transfer model. We have retrieved accurate values of total ozone using continuous spectral scan mode data from the Nimbus 7 Satellite Backscatter Ultraviolet (SBUV) spectrometer. Systematic effects resulting from calibration and algorithmic errors have been removed. The continuous scan mode total ozone measurements serve as independent validation of total ozone measurements and trends derived from TOMS and SBUV discrete mode, both of which have better temporal and spatial coverage than SBUV continuous scan mode but fewer channels. At wavelengths between 340 and 400 nm, radiances are sensitive to several properties of clouds and aerosols. We have used rotational-Raman scattering signatures near 360 nm and at the 394 nm calcium solar Fraunhofer line to determine effective UV cloud pressures with both TOMS and SBUV in continuous scan mode. At 280 nm, resonance scattering from magnesium ions has been detected. Spatial and temporal variations in magnesium ion column abundances, including increases with increased solar activity, have been derived from SBUV continuous scan measurements.
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Joanna Joiner, Joanna Joiner, Pawan K. Bhartia, Pawan K. Bhartia, Ernest Hilsenrath, Ernest Hilsenrath, } "Remote sensing applications of continuous spectral backscatter ultraviolet measurements", Proc. SPIE 2831, Ultraviolet Atmospheric and Space Remote Sensing: Methods and Instrumentation, (8 November 1996); doi: 10.1117/12.257188; https://doi.org/10.1117/12.257188
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