Dr. Mariana Adam Profile

Dr. Mariana Adam

Research Associate at Met Office

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Proceedings Article | 3 October 2007 Paper

Systematic distortions in water vapor mixing ratio and aerosol scattering ratio from a Raman lidar

Mariana Adam, Demetrius Venable

Proceedings Volume 6750, 67500S (2007) https://doi.org/10.1117/12.738205

KEYWORDS: Calibration, Aerosols, LIDAR, Backscatter, Raman spectroscopy, Error analysis, Scattering, Raman scattering, Nitrogen, Mass attenuation coefficient

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The purpose of this study is to estimate the errors due to several systematic distortions which occur in the procedure of computing water vapor mixing ratio (WVMR) and aerosol scattering ratio (ASR). For WVMR, the systematic distortions are encountered during the following processes: gluing, omission of temperature dependent molecular backscatter coefficient (temperature dependent lidar equation), incomplete overlap correction, and calibration while for ASR during the gluing and omission of temperature dependent molecular backscatter coefficient. The data analyzed are taken with Howard University Raman Lidar (HURL) during WAVES 2006 field campaign. The HURL system operates at the third harmonic of a Nd:YAG laser and acquires data within three channels (354.7 nm, 386.7 nm and 407.5 nm). The study shows the relative errors in computing WVMR and ASR when considering different combinations of the systematic distortions (15 cases for WVMR and 3 cases for ASR) with respect to the case as considered true. The analyses were performed over a time series of WVMR and ASR of about 6 hours and over the altitude range up to 5 km. The range of the relative errors is between ~ 1 % and ~ 18 % for WVMR and between ~ 1 % and ~ 8 % for ASR.

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