구름에서의 다중산란효과 계산 및 이를 이용한 구름 물리변수 원격 추출 방법 연구
Calculation of Multiple Scattering in Water Cloud and Application in Remote Measurement of Cloud Physical Properties
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초록
구름에서의 다중산란 효과는 Mie 산란현상을 이용하는 탄성산란 라이다에서 그 해를 구하는데 있어서, 매우 중요한 오차요인으로 작용하기 때문에 이 효과를 보정하는 것은 그 자체만으로도 매우 중요하다. 이를 위하여 구름에서 다중산란되는 현상을Monte Carlo 방법으로 계산하였으며, 이 결과를 적용하여 물방울 구름의 총량과 유효입자크기를 추출하는 방법을 제안하였다. 구름의 유효입자 크기가 2.5 μm 이하일 경우엔 355 nm나 1064 nm에서 얻은 두 파장의 소광계수로 쉽게 그 값들을 구할 수있음을 알 수 있었다. 크기가 큰 경우엔 라이다 신호의 안정화된 선형편광도가 유효입자크기, 총량, 그리고 소광계수와 관련이있음을 알 수 있었으며, 이 관계를 통하여 큰 입자의 경우에도 라만 라이다와 편광 라이다를 이용한다면 유효입자크기와 총량을구할 수 있다는 것을 알 수 있었다.
Abstract
Multiple scattering effects in cloud are important error sources of the Mie scattering Lidar inversion method, which should bemeasured to correct the Lidar equation in single wavelength Mie Lidar. We have calculated the multiple scattering effects in liquidwater clouds by using a Monte Carlo method, and we have applied these multiple scattering effects in measuring water cloudeffective size and LWC (Liquid Water Content). When cloud effective size is less than 2.5 m, we can easily extract cloudeffective size and LWC by using two wavelength Lidar such as extinction coefficients measured at 355nm and 1064nm. For alarger size cloud, we can find that saturated degree of linear polarization is strongly correlated with cloud effective size, LWC,and extinction coefficients. From these correlations we know that we can measure LWC and cloud effective size if we use singlewavelength Rotational Raman Lidar and Mie scattering polarization Lidar.
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