开路双梳Spectroscopy探测4.5 μm ~ 5 μm波段多组分痕量气体
Open-path Dual-comb Spectroscopy for Multispecies Trace Gas Detection in the 4.5 μm to 5 μm Spectral Region
摘要：
开放式光路双梳光谱技术可提供高精度的多组分大气气体浓度测量。在这里，我们扩展开放路径双梳光谱到中红外5 μm大气窗口，使大气浓度反演的主要温室气体，N $_2$ O，CO $_2$，和H $_2$ O以及标准空气污染物质O $_3$和CO跨越600米和2公里的往返路径。我们演示了在两分钟的时间分辨率与80%的分辨率在五天内的测量。所达到的精度是足够的，以解决大气中的多种气体的浓度变化;检索的干混合比CO和N $_2$ O是在良好的协议与共定位点传感器。此外，检索到的过量CO与CO的比率$_2$同意类似的城市研究，但不同意美国国家排放清单的3倍。我们反演的过量N $_2$ O与CO $_2$的比值表现出一个依赖于羽流的值，表明温室气体N $_2$ O的来源的可变性。
英文摘要：
Open-path dual-comb spectroscopy provides multi-species atmospheric gas concentration measurements with high precision. Here, we extend open-path dual comb spectroscopy to the mid-infrared 5 μm atmospheric window, enabling atmospheric concentration retrievals of the primary greenhouse gases, N$_2$O, CO$_2$, and H$_2$O as well as the criterion air pollutants O$_3$ and CO across 600 m and 2 km round-trip paths. We demonstrate measurements over a five-day period at two-minute temporal resolution with 80% uptime. The achieved precision is sufficient to resolve the atmospheric concentration variations of the multiple gas species; retrieved dry mixing ratios of CO and N$_2$O are in good agreement with a co-located point sensor. In addition, the retrieved ratio of excess CO vs CO$_2$ agrees with similar urban studies but disagrees with the US National Emission Inventory by a factor of 3. Our retrieved ratio of excess N$_2$O vs CO$_2$ exhibits a plume-dependent value, indicating the variability of sources of the greenhouse gas N$_2$O.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
