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

众所周知，造成臭氧空洞(春季极低平流层臭氧大量消耗)的主要原因是极地冬季氯物种的异质处理，即平流层氯的活化。尽管它们对臭氧层有巨大的影响，但像ClO和ClOOCl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)是氯活化的一个重要指标，可以用遥感方法比ClO或ClOCl2更容易测量。我们建议开发从SCIAMACHY卫星仪器的边缘和掩星测量中反演OClO垂直剖面的算法。将在光谱学、辐射传输模拟和反演方法方面对反演进行优化。经过验证，获得的剖面将用于各种科学研究，如年际和半球间的比较(氯活化量和剖面峰高的变异性和演变)，案例研究(与平流层温度、其他平流层痕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。与同样从SCIAMACHY测量中提取的NO2、BrO和O3剖面相结合，获得的OClO昼夜剖面数据集将被用于研究平流层化学中当前悬而未决的问题。

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.