| 摘要: |
| 采用非分散红外技术(NDIR)的大气二氧化碳(CO2)传感器因具有显著的成本优势而成为传统光腔衰荡光谱(CRDS)CO2分析仪的重要补充。为了低成本、常态化地开展基于中国第一高楼—上海中心大厦的城市大气CO2浓度廓线观测,本研究选取2种中精度NDIR CO2传感器(代号分别为A1和A2)并与基于离轴积分腔输出光谱技术ICOS的CO2分析仪(LGR)在四个高度(25 m、255 m、500 m 和 585 m)开展外场比对评估。结果表明,(1)NDIR与LGR在不同高度的观测浓度走势都基本一致,能满足不同高度的长期趋势观测需要；(2)时间步长越长,NDIR与LGR的相关性越高,表明通过牺牲一定时间分辨率即可优化和削减中精度和高精度CO2观测结果的质量差距；(3)2种国产传感器在近地面的性能优于高空,且A2稳定性优于A1。 |
| 关键词: 温室气体 垂直观测 中精度传感器 上海中心大厦 |
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| Effect evaluation of vertical observation based on medium precision CO2 sensor in Shanghai Tower |
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| Abstract: |
| The atmospheric carbon dioxide (CO2) sensor that uses non-dispersive infrared technology (NDIR) has become an important supplement to traditional cavity ring-down spectroscopy (CRDS) CO2 analyzers due to its significant cost advantages. In order to carry out low-cost and normalized observation of urban atmospheric CO2 concentration profile based on the Shanghai Tower, this study selected two types of medium precision NDIR CO2 sensors (code-named A1 and A2) and compared them with a CRDS CO2 analyzer (LGR) at four heights (25 m, 255 m, 500 m, and 585 m) in the field. The results show that (1) The NDIR data and LGR data have basically consistent concentration trends at different heights, which can meet the long-term trend observation needs at different heights; (2) The longer the time step, the higher the correlation between the NDIR and LGR, indicating that sacrificing a certain time resolution can optimize and reduce the quality gap between medium and high-precision CO2 observation results; (3) Two domestically produced sensors have better performance near the ground than at high altitudes, and A2 has better stability than BJ. |
| Key words: Greenhouse gases, Vertical observation, Medium accuracy sensors, Shanghai Tower |
