Investigating stratospheric chlorine chemistry by SCIAMACHY measurements in limb and occulation geometry: Retrieval and intepretation of vertical OCIO profiles

众所周知，臭氧空洞（春季极地平流层下部臭氧的大量消耗）的主要原因是极地冬季氯物质的异质处理，平流层氯活化。尽管它们对臭氧层有巨大的影响，但对ClO和ClOOCl等活性氯化合物的日常和全球测量很少。另一方面，二氧化氯（OClO）是氯活化的重要指标，可以通过遥感方法比ClO或ClOOCl更容易测量。我们建议开发的算法检索的垂直OClO配置文件的肢体和掩星测量的卫星仪器SCIAMACHY。将在光谱学、辐射传输建模和反演方法方面对反演进行优化。经验证后，所获得的廓线将应用于各种科学研究，如跨年度和跨半球的比较（氯活化的幅度和轮廓峰高的变化和演变），案例研究（与平流层温度、其他平流层痕量气体和山波激活的关系），并与已建立的模型模拟结果进行比较。结合NO2，BrO和O3剖面，也从SCIAMACHY测量检索，OClO的白天和夜间的时间配置文件的数据集将被用来调查目前在平流层化学的开放问题。

It is well established that the major cause for the ozone hole (the massive depletion of ozone in the polar lower stratosphere in springtime) is the heterogeneous processing of chlorine species during polar winter, the stratospheric chlorine activation. Despite their immense effect on the ozone layer, daily and global measurements of active chlorine compounds like ClO and ClOOCl are rare. On the other hand, chlorine dioxide (OClO), an important indicator for chlorine activation, can be measured by remote sensing methods more easily than ClO or ClOOCl. We propose to develop algorithms for the retrieval of vertical OClO profiles from the limb and occultation measurements of the satellite instrument SCIAMACHY. The retrievals will be optimised in terms of spectroscopy, radiative transfer modeling and inversion approach. After validation, the obtained profiles will be applied to various scientific studies like inter-annual and inter-hemispheric comparisons (variability and evolution of the magnitude and profile peak height of chlorine activation), case studies (relation to stratospheric temperatures, other stratospheric trace gases, and activation by mountain waves), and comparison to results from established model simulations.In combination with NO2, BrO and O3 profiles, also retrieved from the SCIAMACHY measurements, the obtained dataset of day and night time profiles of OClO will be utilized to investigate current open questions in stratospheric chemistry.