Error analysis of Raman differential absorption lidar ozone measurements in ice clouds.

Error analysis of Raman differential absorption lidar ozone measurements in ice clouds. Research Abstract Details 

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Error analysis of Raman differential absorption lidar ozone measurements in ice clouds. Abstract Text:

A formalism for the error treatment of lidar ozone measurements with the Raman differential absorption lidar technique is presented. In the presence of clouds wavelength-dependent multiple scattering and cloud-particle extinction are the main sources of systematic errors in ozone measurements and necessitate a correction of the measured ozone profiles. Model calculations are performed to describe the influence of cirrus and polar stratospheric clouds on the ozone. It is found that it is sufficient to account for cloud-particle scattering and Rayleigh scattering in and above the cloud; boundary-layer aerosols and the atmospheric column below the cloud can be neglected for the ozone correction. Furthermore, if the extinction coefficient of the cloud is ?0.1 km(-1), the effect in the cloud is proportional to the effective particle extinction and to a particle correction function determined in the limit of negligible molecular scattering. The particle correction function depends on the scattering behavior of the cloud particles, the cloud geometric structure, and the lidar system parameters. Because of the differential extinction of light that has undergone one or more small-angle scattering processes within the cloud, the cloud effect on ozone extends to altitudes above the cloud. The various influencing parameters imply that the particle-related ozone correction has to be calculated for each individual measurement. Examples of ozone measurements in cirrus clouds are discussed.

Error analysis of Raman differential absorption lidar ozone measurements in ice clouds. Publishing Authors By Initials

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Error analysis of Raman differential absorption lidar ozone measurements in ice clouds. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Applied optics

VOLUME: 39

Page Numbers: 6058-71

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ISSN: 0003-6935

DAY: 20

MONTH: Nov

YEAR: 2000

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LANGUAGE: eng

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Country: United States

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MEDLINETA: Appl Opt

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