Mixing processes in the stratosphere from fine to global scales with a fast high precision QCL spectrometer for N2O and CO on HALO

在这项工作中，我们将使用新的高分辨率示踪测量来研究不同尺度的混合过程，以1)研究TIL对混合和交换的影响2)解决平流层内季风影响空气的衰减3)量化从不同来源区域输送到温带对流层上层/平流层下层（ExUTLS）的空气的大尺度部分。为此目的，我们建议在HALO有效载荷上应用一种新的最先进的仪器。该仪器是一台量子级联激光吸收光谱仪，能够同时测量CO和N2O，精度为0.1 ppbv/Hz，最大时间分辨率为3Hz。高精度使我们能够以前所未有的细节研究混合过程，并识别平流层内不同气团之间的混合。我们将研究导致受季风影响的细丝和混合退化的过程，以及这些示踪剂的大规模分布。将CLaMS轨迹分析与基于CO的预算方法相结合，可以量化气团的比例和来源，这些气团决定了季风季节ExUTLS的组成。我们还将分析扩展到HALO项目POLSTRACC的数据，该项目在冬季和春季进行，以计算季节性对比气团预算。

Within this proposed work we will use novel highly resolved tracer measuremnents to study mixing processes at different scales to 1) investigate the effect of the TIL on mixing and exchange 2) to resolve the decay of monsoon affected air within the stratosphere 3) to quantify the large scale fraction of air which is transported from different source regions into the extratropical upper troposphere / lower stratosphere (ExUTLS). For this purpose we propose to apply a novel state-of-the-art instrument to the HALO payload. The instrument is a quantum cascade laser absorption spectrometer capable of simultaneously measuring CO and N2O with a precision of 0.1 ppbv/Hz and a maximum time resolution of 3Hz. The high precision allows to study mixing processes with unprecedented detail and to identify mixing between different air masses within the stratosphere. We will investigte the processes which lead to a degradation of monsoon affected filaments and mixing as well as the large scale distribution of these tracers. Combining CLaMS trajectory analysis with a CO based budget approach allows to quantify the fraction and origin of air masses which determine the composition of the ExUTLS during the monsoon season. We will extend the analysis also to data from the HALO project POLSTRACC, which took place in winter and spring to calculate a seasonaly contrasting air mass budget.