# Spectral derivatives of optical depth for partitioning aerosol type and loading

Tang Huang Lin, Si Chee Tsay, Wei Hung Lien, Neng Huei Lin, Ta Chih Hsiao

3 引文 斯高帕斯（Scopus）

## 摘要

Quantifying aerosol compositions (e.g., type, loading) from remotely sensed measurements by spaceborne, suborbital and ground-based platforms is a challenging task. In this study, the first and second-order spectral derivatives of aerosol optical depth (AOD) with respect to wavelength are explored to determine the partitions of the major components of aerosols based on the spectral dependence of their particle optical size and complex refractive index. With theoretical simulations from the Second Simulation of a Satellite Signal in the Solar Spectrum (6S) model, AOD spectral derivatives are characterized for collective models of aerosol types, such as mineral dust (DS) par-ticles, biomass-burning (BB) aerosols and anthropogenic pollutants (AP), as well as stretching out to the mixtures among them. Based on the intrinsic values from normalized spectral derivatives, referenced as the Normalized Derivative Aerosol Index (NDAI), a unique pattern is clearly exhibited for bounding the major aerosol components; in turn, fractions of the total AOD (f AOD) for major aerosol components can be extracted. The subtlety of this NDAI method is examined by using measurements of typical aerosol cases identified carefully by the ground-based Aerosol Robotic Network (AERONET) sun–sky spectroradiometer. The results may be highly practicable for quantifying f AOD among mixed-type aerosols by means of the normalized AOD spectral derivatives.

原文 ???core.languages.en_GB??? 1544 Remote Sensing 13 8 https://doi.org/10.3390/rs13081544 已出版 - 2 4月 2021

## 指紋

• ### 亞洲大氣污染物之整合監測與其對環境及氣候之衝擊研究-子計畫：衛星反演三維氣膠參數在空氣品質監測及預報模式之研發與應用

Lin, T.

1/08/1931/07/20

研究計畫: Research

• ### 亞洲大氣污染物之整合監測與其對環境及氣候之衝擊研究-子計畫：整合衛星反演和地面觀測氣膠參數在細懸浮微粒即時監測與預報模式之研發應用

Lin, T.

1/08/1831/07/19

研究計畫: Research