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3-D Perspectives of Atmospheric Aerosol Optical Properties over Northeast Asia Using LIDAR on-board the CALIPSO satellite

CALIPSO위성 탑재 라이다를 이용한 동북아시아 지역의 대기 에어러솔 3차원 광학특성 분포

  • Lee, Kwon-Ho (Department of Geoinformatics Engineering, Kyungil University)
  • 이권호 (경일대학교 공간정보공학과)
  • Received : 2014.07.29
  • Accepted : 2014.10.08
  • Published : 2014.10.31

Abstract

Backscatter signal observed from the space-borne Light Detection And Ranging (LIDAR) system is providing unique 3-dimensional spatial distribution as well as temporal variations for atmospheric aerosols. In this study, the continuous observations for aerosol profiles were analyzed during a years of 2012 by using a Cloud-Aerosol LIDAR with Orthogonal Polarization (CALIOP), carried on the Cloud-Aerosol LIDAR and Infrared Pathfinder Satellite Observation (CALIPSO) satellite. The statistical analysis on the particulate extinction coefficient and depolarization ratio for each altitude was conducted according to time and space in order to estimate the variation of optical properties of aerosols over Northeast Asia ($E110^{\circ}-140^{\circ}$, $N20^{\circ}$ $-50^{\circ}$). The most frequent altitudes of aerosols are clearly identified and seasonal mean aerosol profiles vary with season. Since relatively high particle depolarization ratios (>0.5) are found during all seasons, it is considered that the non-spherical aerosols mixed with pollution are mainly exists over study area. This study forms initial regional 3-dimensional aerosol information, which will be extended and improved over time for estimation of aerosol climatology and event cases.

위성 탑재 라이다 시스템이 관측하는 후방산란 신호는 대기 에어러솔의 3차원 공간적인 분포 특성 및 시간적인 변화를 탐지할 수 있게 한다. 본 연구에서는 Cloud-Aerosol LIDAR and Infrared Pathfinder Satellite Observation(CALIPSO) 위성에 탑재된 Cloud-Aerosol LIDAR with Orthogonal Polarization(CALIOP) 라이다 관측자료를 이용하여 2012년 한 해 동안의 동북아시아 지역(북위 20도 - 50도, 동경 110 도 - 140 도)의 대기 에어로졸의 시공간 분포를 분석하였다. 입자 소산계수와 편광소멸도의 통계 분석으로부터 각 고도별 에어러솔 입자의 광학 특성정보를 분석하였고, 각 계절별 에어러솔 광학 특성값의 연직분포정보를 정량화할 수 있었다. 또한, 편광소멸도 자료는 연중 0.5 이상의 큰 값을 보이고 있어 지역 대기에는 비구형성 입자에 의한 영향이 많이 받고 있음을 알 수 있었다. 본 연구는 지역적 규모의 3차원 에어러솔 분포 정보에 대한 기초연구로서, 향후 추가 자료 조사를 통하여 보다 다양한 이벤트성 사례와 에어러솔 기후학적 정보를 생산할 것이다.

Keywords

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