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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Column closure studies of lower tropospheric aerosol and water vapor during ACE-Asia using airborne Sun photometer and airborne in situ and ship-based lidar measurements - art. no. 8656
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Column closure studies of lower tropospheric aerosol and water vapor during ACE-Asia using airborne Sun photometer and airborne in situ and ship-based lidar measurements - art. no. 8656

机译：使用机载太阳光度计，机载原位和舰船激光雷达测量技术，对亚洲对流层下低层对流层气溶胶和水蒸气的色谱柱封闭研究-艺术。没有。 8656

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摘要

We assess the consistency (closure) between solar beam attenuation by aerosols and water vapor measured by airborne Sun photometry and derived from airborne in situ and ship-based lidar measurements during the April 2001 Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia). The airborne data presented here were obtained aboard the Twin Otter aircraft. Comparing aerosol extinction sigma(ep)(550 nm) from four different techniques shows good agreement for the vertical distribution of aerosol layers. However, the level of agreement in absolute magnitude of the derived aerosol extinction varied among the aerosol layers sampled. The sigma(ep)(550 nm) computed from airborne in situ size distribution and composition measurements shows good agreement with airborne Sun photometry in the marine boundary layer but is considerably lower in layers dominated by dust if the particles are assumed to be spherical. The sigma(ep)(550 nm) from airborne in situ scattering and absorption measurements are about similar to13% lower than those obtained from airborne Sun photometry during 14 vertical profiles. Combining lidar and the airborne Sun photometer measurements reveals the prevalence of dust layers at altitudes up to 10 km with layer aerosol optical depth (from 3.5 to 10 km altitude) of similar to0.1 to 0.2 (500 nm) and extinction-to-backscatter ratios of 59-71 sr (523 nm). The airborne Sun photometer aboard the Twin Otter reveals a relatively dry atmosphere during ACE-Asia with all water vapor columns <1.5 cm and water vapor densities ρ(w) < 12 g/m(3). Comparing layer water vapor amounts and rw from the airborne Sun photometer to the same quantities measured with aircraft in situ sensors leads to a high correlation (r(2) = 0.96), but the Sun photometer tends to underestimate rho(w) by 7%. [References: 55]
机译：在2001年4月的亚太地区气溶胶表征实验（ACE-Asia）期间，我们评估了气溶胶对太阳光束的衰减与通过机载太阳光度法测量并从机载原位和船基激光雷达测量得出的水蒸气之间的一致性（闭合）。这里显示的机载数据是从Twin Otter飞机上获得的。比较来自四种不同技术的气溶胶消光西格玛（ep）（550 nm），可以很好地了解气溶胶层的垂直分布。然而，在所采样的气溶胶层之间，所产生的气溶胶绝灭的绝对量的一致性水平有所不同。根据机载原位尺寸分布和成分测量结果计算出的sigma（ep）（550 nm）与海洋边界层中的机载太阳光度法显示出良好的一致性，但是如果假定颗粒为球形，则在以尘埃为主的层中其含量要低得多。在14个垂直剖面中，机载原位散射和吸收测量的sigma（ep）（550 nm）比机载Sun光度法测得的值低约13％。激光雷达和机载太阳光度计的测量结果相结合，揭示了在高达10 km的高度上尘埃层的普遍性，其中层气溶胶光学深度（从3.5到10 km高度）接近0.1到0.2（500 nm），并且消灭了背向散射比率为59-71 sr（523 nm）。双水獭船上的机载太阳光度计显示出在ACE亚洲期间相对干燥的大气，所有水蒸气柱<1.5 cm，水蒸气密度ρ（w）<12 g / m（3）。将机载太阳光度计的层水蒸气量和rw与飞机原位传感器测得的相同量进行比较会导致高度相关性（r（2）= 0.96），但是太阳光度计会低估rho（w）7％ 。 [参考：55]

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