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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Subminute measurements of SO2 at low parts per trillion by volume mixing ratios in the atmosphere
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Subminute measurements of SO2 at low parts per trillion by volume mixing ratios in the atmosphere

机译：通过大气中的体积混合比以不到万亿分之几的亚二氧化硫测量

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The continuous sulfur dioxide detector (CSD) is a sensitive instrument for reliable measurements at high time resolution in the atmosphere. This new instrument is based on a SO2, measurement technique utilizing the sulfur chemiluminescence detector, previously validated in a rigorously blind experiment sponsored by the National Science Foundation. Simplified sample handling, denuder separation technology, and the intrinsic sensitivity and fast response of the detector permit measurement at levels below 100 parts per trillion by volume in tens of seconds with the CSD. The CSD provides a differential measurement where response from ambient SO2 is determined by the difference between air containing SO2 and air scrubbed Of SO2, where both air samples contain other detectable sulfur species. Digital signal post processing with phase-locked amplification of the detector signal enhances the precision and temporal resolution of the CSD. Oversampling of the detector signal at 10 Hz permits subsequent data retrieval to be adapted to changing ambient levels by either enhancing signal to noise when sulfur dioxide levels are low or by maximizing temporal resolution of derived data when levels are high. The instrument has advantages over existing instruments based on chromatographic separation in that the CSD provides accurate and reliable measurements at low parts per trillion by volume sulfur dioxide with high time resolution. The CSD is compact and automated and does not require cryogenic materials, making this instrument suitable for remote field locations. The high temporal resolution, specificity for SO2, and sensitivity of the CSD make it a good candidate for installation on an aircraft. Airborne studies Of SO2 with a sensitive, fast time response instrument may offer new insight into the understanding of phenomena such as gas-to-particle conversion, long-range transport of pollutants, and the oxidation of biogenically produced sulfur gases. [References: 31]
机译：连续二氧化硫检测器（CSD）是灵敏的仪器，可在大气中以高时间分辨率进行可靠的测量。这种新仪器基于使用硫化学发光检测器的SO2测量技术，该技术先前在国家科学基金会（National Science Foundation）赞助的严格盲实验中得到了验证。简化的样品处理，剥蚀剂分离技术以及检测器的固有灵敏度和快速响应，使得使用CSD可以在数十秒内以低于万亿分之100的体积测量水平。 CSD提供了一种差分测量，其中来自环境SO2的响应由含SO2的空气与经SO2净化的空气之间的差异确定，其中两个空气样品都包含其他可检测到的硫物质。对检测器信号进行锁相放大的数字信号后处理提高了CSD的精度和时间分辨率。通过以10 Hz的频率对检测器信号进行过采样，可以通过在二氧化硫水平较低时增强信噪比或在水平较高时最大化派生数据的时间分辨率来使随后的数据检索适应变化的环境水平。与基于色谱分离的现有仪器相比，该仪器具有优势，因为CSD能够以高的时间分辨率，以万亿分之二的二氧化硫体积提供准确而可靠的测量。 CSD紧凑且自动化，不需要低温材料，因此适合于偏远现场。 CSD的高时间分辨率，对SO2的特异性和灵敏度使其非常适合在飞机上安装。使用灵敏，快速响应的仪器对SO2进行空气传播的研究，可能会为了解以下现象提供新的见解，例如气体到颗粒的转化，污染物的长距离迁移以及生物产生的硫气的氧化。 [参考：31]

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