Abstract. Continental greenhouse gas monitoring networks extensively use tall towers for higher spatial representativeness. In most cases, several intakes are built along the tower to give information also on the vertical concentration profile of the components considered. Typically, a single gas analyzer is used, and the intake points are sequentially connected to the instrument. It involves that the continuous concentration signal is only sampled for discrete short periods at each intake points, which does not allow the perfect reconstruction of the original concentration variation. It increases the uncertainty of the calculated hourly averages usually used by the transport and budget models. The purpose of the study is to give the data users an impression on the potential magnitude of this kind of uncertainty, as well as how it depends on the number of intakes sampled, on the length of the sampling period at each intake, on the season, and on the time of the day. It presents how much improvement can be achieved using linear or spline interpolation between the measurement periods instead of the simple arithmetic averaging of the available measurements. Although the results presented here may be site-specific, the study calls attention to the potentially rather heterogeneous spatial and temporal distribution of the uncertainty of the hourly average concentration values derived from tall-tower measurements applying sequential sampling.

中文翻译：

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非连续测量得出的小时平均浓度值的不确定性

摘要。大陆温室气体监测网络广泛使用高塔来提高空间代表性。在大多数情况下，沿着塔楼会建几个进气口，以提供有关所考虑组分的垂直浓度分布的信息。通常，使用单个气体分析仪，并且进气点顺序连接到仪器。它涉及到连续的浓度信号仅在每个进气点的离散短时间内被采样，这不能完美地重建原始浓度变化。这会增加运输和预算模型通常使用的计算小时平均值的不确定性。这项研究的目的是使数据用户对这种不确定性的潜在规模有一个印象，以及它如何取决于采样的摄入量，每次采样的采样时间长度，季节以及一天中的时间。它显示了使用测量周期之间的线性或样条插值法代替可用测量值的简单算术平均可以实现多少改进。尽管此处给出的结果可能是针对特定地点的，但该研究引起了人们的注意，即时空平均浓度值的不确定性在空间和时间上可能存在异质性，该不确定度是从采用顺序采样的高层测量得出的。它显示了使用测量周期之间的线性或样条插值法代替可用测量值的简单算术平均可以实现多少改进。尽管此处给出的结果可能是针对特定地点的，但该研究引起了人们的注意，即时空平均浓度值的不确定性在空间和时间上可能存在异质性，该不确定度是从采用顺序采样的高层测量得出的。它显示了使用测量周期之间的线性或样条插值法代替可用测量值的简单算术平均可以实现多少改进。尽管此处给出的结果可能是针对特定地点的，但该研究引起了人们的注意，即时空平均浓度值的不确定性在空间和时间上可能存在异质性，该不确定度是从采用顺序采样的高层测量得出的。