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Investigation of the photochemistry of oxygen species in the mesopause region

中层顶区域氧物质光化学的研究

基本信息

批准号：
290344289
负责人：
Professor Dr. Christian von Savigny, Ph.D.
金额：
--
依托单位：
Institut für Physik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/290344289?language=en
关键词：
Investigation photochemistry oxygen species mesopause

项目摘要

Atomic oxygen (O) is one of the most important chemical constituents of the terrestrial mesopause region. It plays an essential role for the energy balance of this atmospheric region. Due to its long chemical lifetime it is capable of transporting chemical potential energy over large distances. It participates indirectly in the radiative cooling of the mesopause region and it is directly coupled to the less abundant ozone, which in turn governs diabatic solar heating of mesosphere. The number of O measurements in the mesopause region is rather limited, and most of the available observations are based on measurements of the O2, O and OH airglow emissions. These measurements are indirect measurements and generally require knowledge of a large number of photochemical rate constants. Existing studies provide clear evidence that the currently used models to describe the O2 A-band, the O green line and the OH Meinel emissions, which are all driven by atomic oxygen, are inconsistent. Within the frame of this proposal we are planning on investigating the consistency of the existing photochemical models of the three airglow emissions mentioned. This will be done using the synergy of simultaneous satellite observations of all three emissions and dedicated model simulations. The satellite measurements to be used were carried out with the SCIAMACHY (Scanning Imaging Absorption spectroMeter for Atmospheric CHartographY) instrument on the Envisat spacecraft, which operated from 2002 to 2012. SCIAMACHY is uniquely suited for this purpose, because with its broad spectral range it covers all the airglow emissions relevant for this proposal and provides simultaneous and spectrally resolved observations of these emissions. The planned model simulations will be performed with a suite of established photochemical and global models. Using an inverse modelling approach, we plan on carrying out an optimization of photochemical model parameters by simultaneously minimizing the differences between model results and the SCIAMACHY observations. In addition, we plan on performing a thorough characterization of the spatial and temporal variability of O in the mesopause region, with particular focus on solar influence and potential long-term variations over the period from 2002 to 2012. Furthermore, our aim is to improve the existing climatological models of O in the mesopause region (e.g., MSIS) - which are clearly inadequate in different respects - using the O time series derived within this project. The applicants are established experts in their main research areas and have long-time experience in the area of satellite remote sensing using terrestrial airglow emissions and atmospheric modelling, respectively.

原子氧(O)是陆地中顶区最重要的化学成分之一。它对该大气区域的能量平衡起着至关重要的作用。由于它的化学寿命长，它能够远距离传递化学势能。它间接参与中间层顶区域的辐射冷却，并与较少的臭氧直接耦合，臭氧反过来控制中间层的非绝热太阳加热。在中间层顶区域测量O的次数相当有限，大多数可用的观测是基于对O2、O和OH气辉发射的测量。这些测量是间接测量，通常需要了解大量的光化学速率常数。现有的研究提供了明确的证据，表明目前用来描述O2 a波段、O绿线和OH Meinel辐射的模型是不一致的，它们都是由氧原子驱动的。在这项建议的框架内，我们计划调查上述三种气辉排放的现有光化学模型的一致性。这将通过同时对所有三种排放进行卫星观测和专门模式模拟的协同作用来完成。将使用的卫星测量是由Envisat航天器上的SCIAMACHY（扫描成像吸收光谱仪用于大气制图）仪器进行的，该仪器于2002年至2012年运行。SCIAMACHY是唯一适合这一目的的，因为它具有广泛的光谱范围，涵盖了与本提案相关的所有气辉发射，并提供了这些发射的同步和光谱分辨率观测。计划中的模型模拟将使用一套已建立的光化学和全球模型进行。利用逆建模方法，我们计划通过同时最小化模型结果与SCIAMACHY观测结果之间的差异来优化光化学模型参数。此外，我们计划对中间层顶区域O的时空变化进行全面表征，特别关注2002年至2012年期间太阳的影响和潜在的长期变化。此外，我们的目标是利用本项目中获得的O时间序列，改进现有的中顶区域（例如MSIS） O气候模型，这些模型在不同方面明显不足。申请人均为各自主要研究领域的知名专家，并分别在利用地面气辉辐射进行卫星遥感及进行大气模拟方面拥有长期经验。