Boundary layer regulation in the southeast Atlantic cloud microphysics during the biomass burning season as seen by the A‐train satellite constellation
Boundary layer regulation in the southeast Atlantic cloud microphysics during the biomass burning season as seen by the A‐train satellite constellation
复制标题
A-train 卫星星座观察到的生物质燃烧季节东南大西洋云微物理的边界层调节
DOI：
10.1002/2014jd022182
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
P. Minnis
中科院分区：
文献类型：
--
作者：
D. Painemal;S. Kato;P. Minnis
生物质燃烧气溶胶对太阳辐射的吸收对大西洋东南部有很强的变暖效应。然而，在生物质燃烧辐射评估中，上覆烟雾气溶胶和低层云微物理学之间的相互作用以及随后的微扰通常被忽略。在这项研究中，云-气溶胶激光雷达和红外探路者卫星观测（CALIPSO）与Aqua卫星观测相结合，来自中分辨率成像光谱仪（MODIS），高级微波扫描辐射计-EOS（AMSR-E），云和地球辐射能量系统（CERES）评估边界层高度和云与气溶胶层之间的分离距离的变化对云的影响微观物理学以每日时间分辨率分析的合并数据表明，尽管随着边界层加深，5°S以北云液态水增加，但上覆的烟雾气溶胶通过减小云滴尺寸来改变云的性质。这些变化是由气溶胶层到云顶的接近程度控制的，而不是气溶胶柱负荷的增加。这些相关性不太可能由气象因素驱动，因为云的变化、对流层低稳定度、地面风和混合比的三个预测因子表明，云的有效半径、云顶高度和液态水路径应该呈正相关。由于云有效半径与微物理变化较大的地区（5° S以北）的云液态水反相关，大气顶部的总体辐射后果是强烈的反照率敏感性，相当于由于云有效半径减少10%而使反照率增加3%。这部分地抵消了气溶胶的太阳吸收。我们的分析强调了在估算大气层顶部生物质燃烧的辐射影响时，考虑烟雾气溶胶在云微物理中的间接影响的重要性。
Solar radiation absorption by biomass burning aerosols has a strong warming effect over the southeast Atlantic. Interactions between the overlying smoke aerosols and low‐level cloud microphysics and the subsequent albedo perturbation are, however, generally ignored in biomass burning radiative assessments. In this study, Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) are combined with Aqua satellite observations from Moderate Resolution Imaging Spectroradiometer (MODIS), Advanced Microwave Scanning Radiometer–EOS (AMSR‐E), and Clouds and the Earth's Radiant Energy System (CERES) to assess the effect of variations in the boundary layer height and the separation distance between the cloud and aerosol layers on the cloud microphysics. The merged data analyzed at a daily temporal resolution suggest that overlying smoke aerosols modify cloud properties by decreasing cloud droplet size despite an increase in the cloud liquid water as boundary layer deepens, north of 5°S. These changes are controlled by the proximity of the aerosol layer to the cloud top rather than increases in the column aerosol load. The correlations are unlikely driven by meteorological factors, as three predictors of cloud variability, lower tropospheric stability, surface winds, and mixing ratio suggest that cloud effective radius, cloud top height, and liquid water path should correlate positively. Because cloud effective radius anticorrelates with cloud liquid water over the region with large microphysical changes—north of 5°S—the overall radiative consequence at the top of the atmosphere is a strong albedo susceptibility, equivalent to a 3% albedo increase due to a 10% decrease in cloud effective radius. This albedo enhancement partially offsets the aerosol solar absorption. Our analysis emphasizes the importance of accounting for the indirect effect of smoke aerosols in the cloud microphysics when estimating the radiative impact of the biomass burning at the top of the atmosphere.
影响因子：
6.3
作者：
V. Fiedler;F. Arnold;S. Ludmann;A. Minikin;L. Pirjola;A. Dörnbrack;H. Schlager
通讯作者：
V. Fiedler;F. Arnold;S. Ludmann;A. Minikin;L. Pirjola;A. Dörnbrack;H. Schlager