Quality assessment of an open-path tuneable diode laser spectrometer for water vapour measurement and scientific studies during first HALO demo missions

在第一个SPP阶段开发了用于部署在HALO上的半导体激光湿度计HAI之后，我们在这里建议在即将到来的四个科学任务期间部署它：TALF/SALSA，Cirrus-ML，Cirrus-RS和POLSTRACC。有计划的频繁部署需要开发新的快速数据检索算法。一个重点将进一步是对HAI和其他HALO湿度计进行强有力的质量控制，这些湿度计将嵌入由联合国牵头的国际计划中，以使HALO水数据（即总水、气相水和冰水含量）与其他国家和国际任务的数据相兼容。这些活动包括根据PTB标准进行验证，在KIT的AIDA室组织和参加国际湿度计验证活动，与HALO和其他平台上的其他仪器进行飞行中相互比较，以及制定国际公认的校准程序标准和新的飞行中校准设备。将用统计方法分析任务期间获得的数据，以编制热带UTLS的水分布及其季节变化。利用FZJ的CLaMS模式对UTLS的动力学过程进行了模拟，重点是对流层顶逆温层。

After the development of the diode laser hygrometer HAI for deployment onboard HALO in the 1stSPP phases, we here propose its deployment during four upcoming scientific missions: TACTS/SALSA, Cirrus-ML, Cirrus-RS and POLSTRACC. The planned frequent deployment requires thedevelopment of new fast data retrieval algorithms. A focus will further be a strong quality controlof HAI and other HALO hygrometers, embedded in international programs lead by SPARC, in orderto make the HALO water data, (i.e. total water, gas phase water, and ice water content) compatiblewith those from other national and international missions. They include validation againstPTB standards, the organization of and participation in an international validation campaign forhygrometers at the AIDA chamber of KIT, in-flight intercomparison with other instruments on HALOand further platforms, and the development of internationally accepted standards for calibrationprocedures and new in-flight calibration equipment. The data obtained during the missionswill be analyzed with statistical methods to compile a water distribution in the extra tropical UTLSand its seasonal variability. Simulations with the CLaMS model of FZJ will be made towards acomprehensive theoretical understanding of dynamical processes in the UTLS with a focus on thetropopause inversion layer.