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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Quantifying aerosol direct radiative effect with Multiangle Imaging Spectroradiometer observations: Top-of-atmosphere albedo change by aerosols based on land surface types
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Quantifying aerosol direct radiative effect with Multiangle Imaging Spectroradiometer observations: Top-of-atmosphere albedo change by aerosols based on land surface types

机译：使用多角度成像分光辐射计观测来量化气溶胶直接辐射效应：气溶胶基于陆地表面类型的大气顶反照率变化

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摘要

Using internally consistent albedo, aerosol, cloud, and surface data from the Multiangle Imaging Spectroradiometer (MISR) instrument onboard the Terra satellite, top-of-atmosphere (TOA) spectral albedo change (dα) in the presence of aerosols over land is estimated and its dependence on aerosol and surface properties is analyzed. Linear regressions between spectral TOA albedo and aerosol optical depth (AOD) for different surface types are examined to derive the aerosol-free TOA albedo. MISR surface BiHemispherical Reflectance (BHR) values are used to differentiate surface types. We find relatively high correlations between spectral TOA albedo and AOD for BHR-stratified data in 2° x 2° grid cells. The global mean values of cloud-free da over land for June-September 2007 are estimated to be 0.018 + 0.003 (blue), 0.010 ± 0.003 (green), 0.007 ± 0.003 (red), and 0.008 ± 0.006 (near-infrared). Individual regions show large variations from these values. Global patterns of dα are determined mainly by AOD and aerosol radiative efficiency. Large positive values of da are observed over regions with high aerosol loading and large single-scattering albedo, where the aerosol scattering effect is dominant. The presence of light-absorbing aerosols reduces aerosol radiative efficiency and dα. Surface reflectance influences both aerosol scattering and absorbing effects. Generally, the aerosol radiative efficiency decreases with increasing BHR. We also examined dα-AOD correlations over different vegetation types. We find the smallest dα values are over needleleaf forests and shrublands, whereas the largest values are over cropland and barren regions. The aerosol radiative efficiencies are lowest over needleleaf forests and barren regions and highest over grasslands and croplands.
机译：使用Terra卫星上的多角度成像光谱仪（MISR）仪器的内部一致的反照率，气溶胶，云和表面数据，估算并在陆地上存在气溶胶的情况下，大气顶（TOA）光谱反照率变化（dα）并分析了其对气溶胶和表面性质的依赖性。研究了光谱TOA反照率和不同表面类型的气溶胶光学深度（AOD）之间的线性回归，以得出无气溶胶的TOA反照率。 MISR表面双半球反射率（BHR）值用于区分表面类型。对于2°x 2°网格单元中的BHR分层数据，我们发现光谱TOA反照率与AOD之间具有较高的相关性。 2007年6月至9月，全球无云da的全球平均值估计为0.018 + 0.003（蓝色），0.010±0.003（绿色），0.007±0.003（红色）和0.008±0.006（近红外） 。各个区域与这些值显示出很大的差异。 dα的总体模式主要由AOD和气溶胶辐射效率决定。在高气溶胶负荷和大单散射反照率的区域中观察到da的正值较大，在该区域中，气溶胶散射效应占主导地位。吸光气溶胶的存在降低了气溶胶的辐射效率和dα。表面反射率会影响气溶胶的散射和吸收效果。通常，气溶胶的辐射效率随着BHR的增加而降低。我们还检查了不同植被类型上的dα-AOD相关性。我们发现，最小的dα值分布在针叶林和灌木丛上，而最大的值分布在农田和荒芜地区。针叶林和贫瘠地区的气溶胶辐射效率最低，草原和耕地的气溶胶辐射效率最高。

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