HAI PolWise, Employment of the HAI-TDLAS Hygrometer for the POLSTRACC and WISE missions on HALO

在过去的4年里，新的多相TDLAS湿度计HAI在许多科学任务(TACTS/ESMVAL/ML-CERRUS/ACRIDICON)、仪器相互比对和严格的计量验证中成功地展示了其独特的能力。在ML-Cirrus期间，HAI展示了第一次使用单一仪器和超过120赫兹的独特时间分辨率同时在空中检测总(冰+气体)和气相水。在ACRIDICON-CHUVA中，HAI在一种新的配置中实现了同步的开路和闭路气相检测，并改进了气体交换时间，例如用于研究采样文物。时至今日，HAI拥有卓越的、几乎100%的可靠性，飞行时间超过300h，飞行里程超过300.000公里。同时，HAI在PTB经过了严格的德国初级水标准验证，并与Aquavit-II战役中最重要的空气湿度计进行了比较。这确保了明确的绝对准确度，并在计量学和气象学之间建立了前所未有的联系，将所有空中运动、Aquavit-II和国际水汽等级相互联系起来。目前的提议将使人们能够参加即将进行的POLSTRACK和WISE飞行任务，这些飞行任务需要高精度和高空间分辨率的气相水探测和核心飞行参数相对湿度的测量。该项目还旨在进一步改进HAI仪器，特别是更快的评估算法。目前，HAI可被视为在Halo上进行现场测量的核心仪器，因为许多基本的科学课题都与更好地了解UTLS中水汽的动力学和空间分布有直接联系。HAI是唯一一台能够在800公里/小时的巡航速度下提供30厘米空间分辨率的仪器，这使得各种新的研究得以实现。

The new multi-phase TDLAS hygrometer HAI has successfully demonstrated its unique capabilities over the past 4 years in many science missions (TACTS/ESMVAL/ML-CIRRUS/ACRIDICON), instrument intercomparisons and stringent metrological validations. During ML-Cirrus HAI demonstrated the first simultaneous airborne detection of total (ice + gas) and gas-phase water with a single instrument and a unique temporal resolution of over 120 Hz. In ACRIDICON-CHUVA HAI realized, in a new configuration, synchronous open- and closed-path gas-phase detection with improved gas exchange times, e.g. to study sampling artefacts. Up to day, HAI has an excellent, almost 100% reliability with more than 300 flight hours and more than 300.000 flight kilometers. In parallel HAI was stringently validated at the primary German water standards at PTB and compared to the most important airborne hygrometers in the Aquavit-II campaign. This ensures a well-defined absolute accuracy and creates an unprecedented link between Metrology and Meteorology, connecting all airborne campaigns, Aquavit-II and the international water vapor scale to each other. The current proposal will enable participation in the upcoming POLSTRACC and WISE missions, which require highly accurate and spatially highly resolved gas phase water detection and measurement of the core flight parameter relative humidity. The project also aims at further improvements of the HAI instrument, in particular faster evaluation algorithms. Currently HAI can be seen as a core instrument for in-situ measurements on HALO, as many essential scientific topics are directly linked a better understanding of the dynamics and spatial distribution of water vapor in the UTLS. HAI is the only instrument which can provide a spatial resolution down to 30 cm at 800 km/h cruising speed which allows a variety of new studies to be realized.