https://scholars.lib.ntu.edu.tw/handle/123456789/339927
標題: | Sensitivity of multiangle imaging to the optical and microphysical properties of biomass burning aerosols | 作者: | Wei-Ting Chen Ralph A. Kahn David Nelson Kevin Yau WEI-TING CHEN |
關鍵字: | Atmospheric aerosols; Atmospheric optics; Atmospheric radiation; Biomass; Mathematical models; Particle size; Sensitivity analysis; aerosol; albedo; algorithm; biomass burning; imaging method; measurement method; optical depth; particle size; remote sensing; satellite imagery; sensitivity analysis | 公開日期: | 五月-2008 | 卷: | 113 | 期: | D10 | 來源出版物: | Journal of Geophysical Research | 摘要: | The treatment of biomass burning (BB) carbonaceous particles in the Multiangle Imaging SpectroRadiometer (MISR) Standard Aerosol Retrieval Algorithm is assessed, and algorithm refinements are suggested, based on a theoretical sensitivity analysis and comparisons with near-coincident AERONET measurements at representative BB sites. Over the natural ranges of BB aerosol microphysical and optical properties observed in past field campaigns, patterns of retrieved Aerosol Optical Depth (AOD), particle size, and single scattering albedo (SSA) are evaluated. On the basis of the theoretical analysis, assuming total column AOD of 0.2, over a dark, uniform surface, MISR can distinguish two to three groups in each of size and SSA, except when the assumed atmospheric particles are significantly absorbing (mid-visible SSA ∼0.84), or of medium sizes (mean radius ∼0.13 μm); sensitivity to absorbing, medium-large size particles increases considerably when the assumed column AOD is raised to 0.5. MISR Research Aerosol Retrievals confirm the theoretical results, based on coincident AERONET inversions under BB-dominated conditions. When BB is externally mixed with dust in the atmosphere, dust optical model and surface reflection uncertainties, along with spatial variability, contribute to differences between the Research Retrievals and AERONET. These results suggest specific refinements to the MISR Standard Aerosol Algorithm complement of component particles and mixtures. They also highlight the importance for satellite aerosol retrievals of surface reflectance characterization, with accuracies that can be difficult to achieve with coupled surface-aerosol algorithms in some higher AOD situations. Copyright 2008 by the American Geophysical Union. |
URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/339927 https://www.scopus.com/inward/record.uri?eid=2-s2.0-48749123462&doi=10.1029%2f2007JD009414&partnerID=40&md5=db268ffb406af4b99d23776670ec9f33 |
DOI: | 10.1029/2007jd009414 |
顯示於: | 大氣科學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。