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The AquaVIT-1 intercomparison of atmospheric water vapor measurement techniques

机译：大气水蒸气测量技术的Aquavit-1相互作用

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The AquaVIT-1 intercomparison of atmospheric water vapor measurement techniques was conducted at the aerosol and cloud simulation chamber AIDA (Aerosol Interaction and Dynamics in the Atmosphere) at the Karlsruhe Institute of Technology, Germany, in October 2007. The overall objective was to intercompare state-of-the-art and prototype atmospheric hygrometers with each other and with independent humidity standards under controlled conditions. This activity was conducted as a blind intercomparison with coordination by selected referees. The effort was motivated by persistent discrepancies found in atmospheric measurements involving multiple instruments operating on research aircraft and balloon platforms, particularly in the upper troposphere and lower stratosphere, where water vapor reaches its lowest atmospheric values (less than 10 ppm). With the AIDA chamber volume of 84 msup3/sup, multiple instruments analyzed air with a common water vapor mixing ratio, by extracting air into instrument flow systems, by locating instruments inside the chamber, or by sampling the chamber volume optically. The intercomparison was successfully conducted over 10 days during which pressure, temperature, and mixing ratio were systematically varied (50 to 500 hPa, 185 to 243 K, and 0.3 to 152 ppm). In the absence of an accepted reference instrument, the absolute accuracy of the instruments was not established. To evaluate the intercomparison, the reference value was taken to be the ensemble mean of a core subset of the measurements. For these core instruments, the agreement between 10 and 150 ppm of water vapor is considered good with variation about the reference value of about ±10% (±1σ). In the region of most interest between 1 and 10 ppm, the core subset agreement is fair with variation about the reference value of ±20% (±1σ). The upper limit of precision was also derived for each instrument from the reported data. The implication for atmospheric measurements is that the substantially larger differences observed during in-flight intercomparisons stem from other factors associated with the moving platforms or the non-laboratory environment. The success of AquaVIT-1 provides a template for future intercomparison efforts with water vapor or other species that are focused on improving the analytical quality of atmospheric measurements on moving platforms.
机译：在2007年10月，在德国卡尔斯鲁厄工业研究所的气溶胶和云模拟室Aida（大气中的气溶胶互动和动态的Aquavit-1的Aquavit-1相互熟练参见。总体目标是对互通国家 - 最现实的和原型大气湿度计，彼此相互作用，并在受控条件下具有独立的湿度标准。该活动作为由选定的裁判协调为盲目互相的。努力通过持续的差异在涉及在研究飞机和气球平台上运行的多种仪器的持续差异，特别是在上层对流层和较低的平流层中，水蒸气达到其最低大气值（小于10ppm）。通过84 m 3 的辅助室容积，通过将空气提取到仪器流量系统，通过定位腔室内的仪器，或通过抽取腔室容积来分析空气，通过将空气分析，或通过对仪器流动系统分析空气。光学。在系统变化的压力，温度和混合比上成功进行了10天的相互作用（50至500HPa，185至243k，0.3至152ppm）。在没有公认的参考文书的情况下，仪器的绝对精度尚未建立。为了评估相互作用，参考值被认为是测量核心子集的集合均值。对于这些核心仪器，10至150ppm的水蒸气之间的协议被认为是良好的差异，参考值约为±10％（±1σ）。在1到10 ppm之间最兴趣的地区，核心子集协议是公平的，其参考值为±20％（±1σ）。从报告的数据中也导出了每种仪器的精度的上限。大气测量的含义是，飞行中观察到的基本上更大的差异，从与移动平台或非实验室环境相关联的其他因素。 Aquavit-1的成功为未来的与水蒸气或其他物种的努力提供了一个模板，这些努力专注于改善移动平台上的大气测量的分析质量。

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