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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >In situ aerosol profiles over the Southern Great Plains cloud and radiation test bed site: 1. Aerosol optical properties - art. no. D06208
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In situ aerosol profiles over the Southern Great Plains cloud and radiation test bed site: 1. Aerosol optical properties - art. no. D06208

机译：南部大平原云层和辐射试验台现场的原位气溶胶剖面：1.气溶胶光学特性-艺术。没有。 D06208

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摘要

Aerosol optical properties were measured over the Southern Great Plains (SGP) cloud and radiation test bed site using a light aircraft (Cessna C-172N). The aircraft flew level legs at altitudes between 500 m and 3500 m several times per week over the course of 2 years in order to obtain a statistically representative data set of in situ aerosol vertical profiles. Instrumentation on the aircraft was similar to that at the surface SGP site so that measurements at the surface and aloft could easily be compared. Measured parameters included total light scattering, backscattering, and absorption, while calculated parameters included single-scattering albedo, backscatter fraction, and Angstrom exponent. Statistical plots of aerosol optical properties and their variation in the lower column (0-4000 m) showed that over the course of the 2 years studied, albedo, backscatter fraction, and Angstrom exponent were fairly invariant with altitude (at least up to 1800 m). Despite the vertical consistency the correlation between column average and surface values for single-scattering albedo, backscatter fraction, and Angstrom exponent tended to be quite low, with R-2 ranging from 0.3 to 0.6 and linear regression slopes ranging from 0.2 to 0.6. These results suggest that long-term surface aerosol measurements capture the column aerosol properties but may not be as representative of day-to-day variations in the column. Comparison of aerosol optical depth (AOD) calculated from the vertical profiles with other measurements of AOD made at SGP (i.e., by the Cimel Sun photometer and the multifilter rotating shadowband radiometer (MFRSR)) showed fair correlation (R(2)similar to0.7 Cimel, R(2)similar to0.8 MFRSR), although the aircraft AODs tend to have a consistent offset of -0.04, even after incorporating a correction for supermicrometer aerosol and stratospheric aerosol. [References: 50]
机译：使用轻型飞机（Cessna C-172N）在南部大平原（SGP）云和辐射测试台现场测量了气溶胶的光学特性。为了获得统计上具有代表性的原位气溶胶垂直剖面数据集，飞机在2年的时间里每周几次在500 m至3500 m的高度上飞行水平腿。飞机上的仪表与SGP地面上的仪表相似，因此可以轻松比较地面和高空的测量结果。测量的参数包括总光散射，反向散射和吸收，而计算的参数包括单散射反照率，反向散射分数和埃指数。下部气柱（0-4000 m）的气溶胶光学特性及其变化的统计图表明，在研究的两年中，反照率，后向散射分数和埃斯特罗姆指数随海拔高度（至少1800 m以下）基本不变。 ）。尽管具有垂直一致性，但单散射反照率，后向散射分数和Angstrom指数的列平均值与表面值之间的相关性往往很低，R-2的范围为0.3到0.6，线性回归斜率的范围为0.2到0.6。这些结果表明，长期的表面气溶胶测量可以捕获色谱柱的气溶胶特性，但可能无法代表色谱柱的日常变化。从垂直剖面计算得到的气溶胶光学深度（AOD）与在SGP进行的其他AOD测量（例如，通过Cimel Sun光度计和多滤光片旋转阴影带辐射计（MFRSR））进行比较，显示出合理的相关性（R（2）类似于0。 7 Cimel，R（2）类似于0.8 MFRSR），尽管飞机AOD趋向于始终具有-0.04的偏移量，即使在对超微米气溶胶和平流层气溶胶进行校正之后也是如此。 [参考：50]

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