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

臭氧空洞（春季极地平流层下层臭氧大量耗损）的主要原因是极地冬季氯种的非均匀加工，即平流层氯活化。尽管它们对臭氧层有巨大的影响，但像ClO和clocl这样的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，与cloo或clocl相比，通过遥感方法更容易测量。我们建议开发从SCIAMACHY卫星仪器的翼面和掩星测量中检索垂直OClO剖面的算法。检索将在光谱学，辐射传输建模和反演方法方面进行优化。验证后，获得的剖面将应用于各种科学研究，如年际和半球间比较（氯活化的幅度和剖面峰高的变异性和演变）、案例研究（与平流层温度、其他平流层微量气体和山波活化的关系），以及与已建立的模式模拟结果的比较。结合从SCIAMACHY测量中获取的NO2、BrO和O3剖面，所获得的OClO昼夜剖面数据集将用于研究当前平流层化学中的开放性问题。

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.