Analysis of high-latitude cirrus cloud feedbacks on the trace gas composition of the UTLS (ICECREAM)

卷云及其对对流层上部和平流层下部微量气体收支的影响是人们了解最少的调节气候变化的因素之一。卷云冰粒的成核和生长可导致最重要的温室气体水蒸气（H2O）的垂直再分配，由于云冰粒的重力沉降。此外，卷云冰粒能够捕获和重新分配硝酸（HNO 3）和其他痕量气体。准确模拟卷云及其对UTLS中痕量气体收支的影响对数值天气预报（NWP）模式和全球气候化学模式提出了挑战。利用在POLSTRACC/GW-LCYCLE/SALSA联合HALO（高海拔和远程研究飞机）使命和模型模拟期间由用于大气辐射成像的万向节翼观测器（格洛丽亚）进行的测量，拟议项目的目标是调查卷云对高纬度UTLS化学成分的影响。

Cirrus clouds and their impact on trace gas budgets in the upper troposphere and lower stratosphere (UTLS) are one of the least understood factors modulating climate change. Nucleation and growth of cirrus cloud ice particles can result in vertical redistribution of the most important greenhouse gas water vapor (H2O) due to gravitational settling of the cloud ice particles. Furthermore, cirrus cloud ice particles are capable of trapping and redistributing nitric acid (HNO3) and other trace gases. Accurate simulations of cirrus clouds and their impact on trace gas budgets in the UTLS pose a challenge for numerical weather prediction (NWP) models and global climate-chemistry models. Using measurements by the Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) during the combined HALO (High Altitude and LOng range research aircraft) mission POLSTRACC/GW-LCYCLE/SALSA and model simulations, the goal of the proposed project is to investigate cirrus-cloud impacts on the chemical composition of the UTLS at high latitudes.