Correlation between the lidar ratio and the Ångström exponent of various aerosol types--颗粒学报PARTICUOLOGY

Song, Y., Zhang, B., Shi, G., Li, S., Di, H., Yan, Q., & Hua, D. (2018). Correlation between the lidar ratio and the Ångström exponent of various aerosol types. Particuology, 40, 62-69. https://doi.org/10.1016/j.partic.2017.12.002

Correlation between the lidar ratio and the Ångström exponent of various aerosol types

Yuehui Song ^*, Bo Zhang, Gaodong Shi, Shichun Li, Huige Di, Qing Yan, Dengxin Hua

School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China

10.1016/j.partic.2017.12.002

Volume 40, October 2018, Pages 62-69

Received 28 February 2017, Revised 21 November 2017, Accepted 1 December 2017, Available online 26 March 2018, Version of Record 28 July 2018.

E-mail: yuehuisong@xaut.edu.cn

Highlights

• Correlations of lidar ratios and Ångström exponents of atmospheric aerosols were evaluated.

• Their Pearson correlation coefficients were found to be larger than 0.95.

• Lidar ratio and Ångström exponent of continental aerosol were correlated with a cubic polynomial.

• Lidar ratios were linearly correlated with Ångström exponents for maritime and desert aerosols.

Abstract

Lidar ratios and Ångström exponents of continental, maritime, and desert aerosols were calculated to evaluate the effects of aerosol composition on these parameters. Their correlation was assessed using correlation analysis and curve fitting. The Pearson correlation coefficient between the lidar ratio and the Ångström exponent was larger than 0.95 in all cases. We verified the reliability of the Pearson correlation coefficient using the significance test. The relationship between the lidar ratio and the Ångström exponent of continental aerosol can be described by a cubic polynomial model; thus, the function relation between the change in lidar ratios at different laser wavelengths depends on the fitting coefficients and the Ångström exponent. The relationship between the lidar ratio and the Ångström exponent of both maritime and desert aerosols can be described by a linear model. In these aerosols, the linear change in lidar ratios at different laser wavelengths remains unaffected by the Ångström exponent. The changes in the lidar ratio in maritime aerosol at 355 nm and 532 nm are −0.7 times and −0.18 times that at 1064 nm, respectively. For desert aerosol, the changes in the lidar ratio at 355 nm and 532 nm are 0.37 times and 1.88 times that at 1064 nm, respectively.

Graphical abstract

Keywords

Lidar ratio; Ångström exponent; Correlation analysis; Continental aerosol; Maritime aerosol; Desert aerosol

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