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首页> 外文期刊>Atmospheric Measurement Techniques >Modification, calibration, and performance of the Ultra-High Sensitivity Aerosol Spectrometer for particle size distribution and volatility measurements during the Atmospheric Tomography Mission (ATom) airborne campaign
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Modification, calibration, and performance of the Ultra-High Sensitivity Aerosol Spectrometer for particle size distribution and volatility measurements during the Atmospheric Tomography Mission (ATom) airborne campaign

机译：超高灵敏度气溶胶光谱仪的修饰，校准和性能，用于粒度分布和大气断层扫描任务期间的挥发性测量（Atom）空中竞选活动

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摘要

Atmospheric aerosol is a key component of the chemistry and climate of the Earth's atmosphere. Accurate measurement of the concentration of atmospheric particles as a function of their size is fundamental to investigations of particle microphysics, optical characteristics, and chemical processes. We describe the modification, calibration, and performance of two commercially available, Ultra-High Sensitivity Aerosol Spectrometers (UHSASs) as used on the NASA DC-8 aircraft during the Atmospheric Tomography Mission (ATom). To avoid sample flow issues related to pressure variations during aircraft altitude changes, we installed a laminar flow meter on each instrument to measure sample flow directly at the inlet as well as flow controllers to maintain constant volumetric sheath flows. In addition, we added a compact thermodenuder operating at 300 degrees C to the inlet line of one of the instruments. With these modifications, the instruments are capable of making accurate (ranging from 7% for D-p 0.07 mu m to 1% for D-p 0.13 mu m), precise (+/- 1.2 %), and continuous (1 Hz) measurements of size-resolved particle number concentration over the diameter range of 0.063-1.0 mu m at ambient pressures of 1000 to 225 hPa, while simultaneously providing information on particle volatility.
机译：大气气溶胶是地球大气层的化学和气候的关键组成部分。精确测量大气颗粒的浓度，作为其尺寸的函数是对颗粒微物质，光学特性和化学过程的研究的基础。我们描述了在大气断层扫描任务（原子）的NASA DC-8飞机上使用的两种商业上可获得的超高敏感气溶胶光谱仪（UHSASS）的改进，校准和性能。为了避免与飞机高度变化期间与压力变化相关的样本流动问题，我们在每个仪器上安装了一个层流量计，以便直接在入口处测量样品流，以及流量控制器以保持恒定的体积鞘流。此外，我们添加了一个紧凑的热调制器，在300度C上运行到其中一条仪器的入口线。通过这些修改，仪器能够精确（DP＆0.13μm），精确（＆ +/- 1.2％）和连续（1 Hz）在＆gt的环境压力下，在0.063-1.0μm的直径范围内测量尺寸分辨的粒子数浓度。 1000至225 HPA，同时提供有关颗粒挥发性的信息。

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